Multi Tech Systems Network Card MT2834ZDX User Manual

MT2834ZDX-Series  
External Data/Fax Modem  
User's Guide  
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Table of Contents  
Contents  
Chapter 1 – Introduction and Installation.................................................................................................4  
Getting Started...........................................................................................................................................4  
Safety Warnings.........................................................................................................................................4  
We Supply..................................................................................................................................................4  
Features.....................................................................................................................................................4  
Modem Installation.....................................................................................................................................5  
Step 1: Attach the Self-Adhesive Feet ..................................................................................................5  
Step 2: Connect the Modem to Your System........................................................................................5  
Step 3: Install the Modem Driver..........................................................................................................6  
Step 4: Install Data Communications Software....................................................................................6  
Removing Your Old Modem from Windows...............................................................................................6  
Chapter 2 – Operation.................................................................................................................................7  
Front Panel ................................................................................................................................................7  
Chapter 3 – AT Commands, S-Registers and Result Codes ..................................................................8  
AT Commands...........................................................................................................................................8  
S-Registers ..............................................................................................................................................18  
Register Unit Range Default Description ............................................................................................18  
Result Codes ...........................................................................................................................................19  
Chapter 4 – Troubleshooting...................................................................................................................20  
Appendix A – Regulatory Compliance....................................................................................................24  
Regulatory Compliance ...........................................................................................................................24  
Regulatory Requirements for the United States .................................................................................24  
Regulatory Requirements for Canada.................................................................................................27  
Appendix B – Technical Specifications..................................................................................................29  
Appendix C – Warranty and Service .......................................................................................................30  
Multi-Tech Warranty Statement ..........................................................................................................30  
Repair Procedures for U.S. and Canadian Customers.......................................................................30  
Repair Procedures for International Customers (Outside U.S.A. and Canada)..................................31  
Repair Procedures for International Distributors.................................................................................31  
Replacement Parts..............................................................................................................................31  
Appendix D - Waste Electrical and Electronic Equipment (WEEE) Statement...................................32  
Index...........................................................................................................................................................33  
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Chapter 1 – Introduction and Installation  
Chapter 1 – Introduction and  
Installation  
Getting Started  
This guide shows you step-by-step how to set up your Multi-Tech MT2834ZDX–Series modem.  
For detailed information on how to install, test, and use your modem, see the User Guide, located on the  
MT2834ZDX system CD provided with your modem.  
Safety Warnings  
Use this product only with UL- and CUL-listed computers (US).  
Never install phone wiring during a lightning storm.  
Never install a phone jack in a wet location unless the jack is specifically designed for wet locations.  
Never touch uninsulated phone wires or terminals unless the phone line has been disconnected at the network  
interface.  
Use caution when installing or modifying phone lines.  
Avoid using a phone during an electrical storm; there is a risk of electrical shock from lightning.  
Do not use a phone in the vicinity of a gas leak.  
To reduce the risk of fire, use only 26 AWG or larger telephone line cord.  
We Supply  
The MT2834ZDX-Series data/fax modem  
A DC power supply module  
One set of four plastic feet  
One telephone cable  
A system CD containing modem drivers, the User Guide, Phone Tools (a data communications program), and  
Acrobat Reader  
Features  
The MT2834ZDX automatically adjusts to line conditions and to the capabilities of the modem it connects to, resulting  
in the highest transmission speed, the most accurate error correction, and the most efficient data compression  
possible for each connection. The MT2834ZDX follows the ITU-T V.34 specification for data rates as high as 28,800  
bps over public telephone lines, while the MT2834ZDXb follows the most recent revision of the V.34 specification for  
data rates up to 33,600 bps. The MT2834ZDX’s features include:  
Support of data rates of 33,600 and 31,200 bps (ZDXb only), 28,800, 26,400, 24,000, 21,600, 19,200,  
16,800, 14,400, 12,000, 9600, 7200, 4800, 2400, 1200, and 300 bps for communicating with older modems  
as well as with other V.34 modems.  
Automatic fallback to slower speeds in noisy line conditions and fall-forward to faster speeds as conditions  
improve.  
ITU-T V.42 LAP-M and MNP Classes 2–4 error correction.  
Data transfer rates up to 115,200 bps with V.42bis data compression.  
Serial port data rates adjustable to 115,200 bps.  
Autodial, redial, pulse (rotary) and touch-tone dial.  
Dial tone and busy signal detection for reliable call progress reporting.  
Compatibility with the standard AT command set used by most communication programs.  
Nonvolatile memory for storage of custom settings and two telephone numbers.  
Sends and receives faxes from your computer at 14,400, 9600, 4800, and 2400 bps.  
Responds to EIA TR29.2 Class 2 fax commands.  
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Chapter 1 – Introduction and Installation  
Modem Installation  
Step 1: Attach the Self-Adhesive Feet  
The modem comes with a set of self-adhesive plastic feet, which you can optionally attach to the modem. To  
install, simply peel them from their paper strip and press them into the recesses on the bottom of the modem.  
Step 2: Connect the Modem to Your System  
Turn off your computer. Place the modem in a convenient location, and then connect it to your computer’s serial  
port, the phone line, AC power, and your phone.  
RS232 Connection  
Plug one end of the serial cable into the RS232 connector on the modem, and the other end into a  
serial port connector on your computer, such as COM1 or COM2.  
LINE Connection  
Plug one end of the phone cable into the MT2834ZDX’s LINE jack and the other end into a phone line  
wall jack.  
Note: The LINE jack is not interchangeable with the PHONE jack. Do not plug the phone into the LINE  
jack or the line cable into the PHONE jack.  
PHONE Connection  
You may optionally plug a telephone into the PHONE jack. This jack is provided as a convenience; you  
may also plug a telephone into a duplex jack inserted into your wall jack.  
POWER Connection  
Plug the power supply module into an AC power outlet or power strip. Plug the power supply’s cable  
into the POWER jack on the modem.  
Note: Use only the power supply supplied with the MT2834ZDX. Use of any other power supply will  
void the warranty and could damage the modem.  
Power-On Test  
Test the modem by turning it on (a power on/off switch is located on the right side). When you apply  
power, the modem performs a diagnostic self-test, indicated by the speed indicators flashing in se-  
quence for a second or two, after which the 28 indicator should light. If this does not happen, check that  
the power switch is on, the power supply is solidly connected, and the AC outlet is live. If these  
measures do not work, see the Troubleshooting chapter..  
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Chapter 1 – Introduction and Installation  
Step 3: Install the Modem Driver  
If you use Windows 98+, you must install the modem driver, which is installed using the Windows Plug and Play  
feature. Follow the four-step procedure below. If you use another operating system, see the Appendix.  
1. Make sure your modem is connected properly, and then turn on your computer. Windows should detect  
your new modem and open the Install New Modem wizard.  
1. Insert the system CD, and then click OK.  
2. Windows installs and configures the modem.  
3. Click Finish to exit.  
For Windows NT, the Install New Modem wizard presents one additional prompt before Step 2. At this prompt,  
select: Don’t detect my modem; I will select it from a list, and then click Next.  
A dialog box with a list of manufacturers and a list of modem models appears. Select your modem. Continue with  
Step 2 above.  
Note: If Windows cannot identify your modem (for instance, if it identifies your modem as a “Standard Modem”),  
click Change. A dialog box with a list of manufacturers and a list of modems appears.  
Step 4: Install Data Communications Software  
Data communications software is designed to send and receive messages. Multi-Tech includes PhoneTools  
communications software with your modem. However, the modem will work with most data communications  
software. To install PhoneTools, insert the CD into the CD-ROM drive; click the PhoneTools icon. You will be  
asked to choose your language. The software automatically loads onto your PC.  
Removing Your Old Modem from  
Windows  
When a new modem replaces another modem, the old modem installation remains in Windows after you install the  
new modem, and the old modem is still selected in HyperTerminal and other Windows applications. Although you can  
change the application connection descriptions one at a time, it is easier to force Windows applications to use the  
new modem by removing the old modem from Windows.  
1. Click the Start button, point to Settings, and click Control Panel.  
2. Double-click the Modems icon to open the Modems Properties dialog box.  
3. In the list box, select the old modem.  
4. Click Remove, then click Close.  
5. The next time you dial a HyperTerminal connection, it will select your new modem and ask you to confirm the  
selection.  
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Chapter 2 – Operation  
Chapter 2 – Operation  
Front Panel  
The MT2834ZDX has ten LED indicators on the front panel that indicate status, configuration, and activity:  
Transmit Data. The TD LED lights when the modem is transmitting data to another modem. The state of the LED  
matches the TD circuit on pin 2 of the RS-232C/V.24 interface.  
Receive Data. The RD LED lights when the modem is receiving data from another modem. The state of the LED  
matches that of the RD circuit on pin 3 of the RS-232C/V.24 interface.  
Carrier Detect. The CD LED lights when the modem detects a valid carrier signal from another modem. It is on when  
the modem is communicating with the other modem and off when the link is broken.  
33,600 bps. The 33 LED lights by itself when the modem connects 33,600 bps operation. This LED also lights or  
blinks in combination with the 14 LED to indicate speeds between 16,800 and 26,400 bps (see table).  
14,400 bps. The 14 LED lights by itself when the modem connects at 14,400 bps. The 14 LED lights or blinks in  
combination with the 28 LED to indicate speeds between 16,800 and 26,400 bps. It lights together with the 96 LED to  
indicate a speed of 12,000 bps.  
9600 bps. The 96 LED lights when the modem connects at 9600 bps. If no speed LED lights, the modem is operating  
at less than 9600 bps.  
Off-Hook. The OH LED lights when the modem is off-hook, which occurs when the modem is dialing, online, or  
answering a call. The LED flashes when the modem pulse-dials.  
Terminal Ready. The TR LED lights when a datacomm program initializes the modem. It means the modem is ready  
for an outgoing or incoming call. It goes off when the datacomm program disconnects the COM port. When it goes  
off, a connected modem will disconnect. The state of the TR LED matches that of the DTR circuit on pin 20 of the RS-  
232C/V.24 interface.  
Error Correction (V.42). The EC LED lights continuously when the modem is in error correction mode, and blinks  
when compression is activated.  
Fax. The FX LED lights when the modem is in fax mode.  
Note: When you turn on the MT2834ZDX, the speed lights flash briefly as the modem does a self-test, then the LED  
for the default modem baud rate lights. The default rate for the MT2834ZDX is 28,800 bps (33,600 bps for the ZDXb)  
unless you select and store another baud rate. After a call, the LEDs for the connection’s baud rate remain lit until  
another call is made or the modem is reset. If you connect at a rate under 9600 bps, all speed LEDs remain off after  
the connection is broken, even though the modem is still turned on.  
Speed Indicator Blink Rates  
The 33, 14, and 96 speed indicators light singly or in combination to indicate data rates.  
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Chapter 3 – AT Commands, S-Registers, and Results Codes  
Chapter 3 – AT Commands, S-  
Registers and Result Codes  
AT Commands  
This section summarizes the AT commands for this modem.  
Command:  
Values:  
AT Attention Code  
n/a  
Description:  
The attention code precedes all command lines except A/, A:, and escape codes.  
Command:  
Values:  
RETURN Key  
n/a  
Description:  
Press the RETURN (ENTER) key to execute most commands.  
Command:  
Values:  
A
n/a  
Force Answer Mode  
Description:  
Answer call before final ring.  
Command:  
Values:  
A/ Repeat Last Command  
n/a  
Description:  
Do not precede this command with AT. Do not press RETURN to execute.  
Command:  
Values:  
A: Continuous Redial  
n/a  
Description:  
Redial last number until answered (10 redials in DOC modems). Do not precede this command with  
AT or press RETURN to execute.  
Command:  
Values:  
&An Answerback  
n = 0 or 1  
Default:  
0
Description:  
&A0 Disables answerback.  
&A1 Enables answerback reply to an ID request.  
Command:  
Values:  
$An Auto-Reliable Buffering  
n = 0 or 1  
Default:  
0
Description:  
$A0 Discard data received during establishment of a reliable connection.  
$A1 Buffer data received during establishment of a reliable connection.  
Command:  
Values:  
#An Auto Speed Detection in Answer Mode  
n = 0–3  
Default:  
0
Description:  
#A0 Start at maximum speed and fall back to a lower speed (26400, 24000, 21600, 19200, 16800,  
14400, 12000, 9600, 7200, 4800, 2400, 1200, or 300 bps) as line conditions warrant.  
#A1 Maximum speed only.  
#A2 Start at maximum speed and fall back decrementally to 4800 bps only.  
#A3 Start at 2400 bps and fall back to 1200 to 300 bps only.  
Command:  
Values:  
&BSn Maximum Reliable Block Size  
n = 0 or 1  
Default:  
1
Description:  
&BS0 Maximum transmit block size of 64 characters.  
&BS1 Maximum transmit block size of 256 characters.  
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Chapter 3 – AT Commands, S-Registers, and Results Codes  
Command:  
Values:  
Default:  
$BAn Baud Adjust  
n = 0 or 1  
0
Description:  
$BA0 Set baud adjust off, speed conversion on. (Serial port speed is independent of modem data  
rate.)  
$BA1 Set baud adjust on, speed conversion off. (Serial port speed is same as modem data rate.)  
Command:  
Values:  
&Cn Carrier Detect Control  
n = 0, 1, 2, or 4  
Default:  
1
Description:  
&C0 Force Carrier Detect high.  
&C1 Let Carrier Detect follow carrier signal.  
&C2 Let Carrier Detect drop on disconnect, then go high again (for some CBX phone systems).  
&C4 Reset modem when Carrier Detect drops.  
Command:  
Values:  
&CDn Cleardown at Disconnect  
n = 0, 1  
Default:  
0
Description:  
&CD0 Execute a cleardown at disconnect.  
&CD1 Do not execute a cleardown at disconnect.  
Command:  
Values:  
Ds Dial  
s = dial string (phone number and dial modifiers)  
Default:  
none  
Description:  
Dial telephone number s, where s may include up to 60 digits and T, P, R, comma, colon, and  
semicolon characters.  
Command:  
Values:  
DsNd Store Telephone Number  
s = dial string (phone number and dial modifiers)  
d = 0 or 1  
Default:  
none  
Description:  
Example:  
To store, enter D followed by dial string s, then N followed by directory number d.  
ATDT9,5551212N1.  
Command:  
Values:  
&Dn Data Terminal Ready Control  
n = 0–3  
Default:  
2
Description:  
&D0 Modem ignores DTR signal.  
&D1 When DTR drops, the modem hangs up. While DTR is low, the modem accepts commands  
but will not dial or auto-answer until DTR goes high again.  
&D2 Same as &D1.  
&D3 When DTR drops, the modem hangs up and resets as if an ATZ command were issued.  
Command:  
Values:  
$Dn DTR Dialing  
n = 0 or 1  
Default:  
0
Description:  
$D0 Do not dial when DTR goes high.  
$D1 Dial stored number N0 when DTR goes high.  
Command:  
Values:  
%DCn AT Command Control  
n = 0 or 1  
Default:  
0
Description:  
%DC0 The modem responds to AT commands.  
%DC1 The modem ignores AT commands.  
Note: The modem will respond to AT%DC for 10 seconds after power-up.  
Command:  
Values:  
%DFn Format Line Probe Data  
n = 0 or 1  
Default:  
0
Description:  
%DF0 Display data in graph format. Y axis is gain shown in dBm.  
%DF1 Display data in table format. Gain is shown numerically in dBm at 75Hz increments from  
150Hz to 3750Hz.  
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Chapter 3 – AT Commands, S-Registers, and Results Codes  
Command:  
Values:  
Default:  
%DPn Read Line Probe Data  
n = 0 or 1  
0
Description:  
%DP0 Do not read and store line probe information from DSP during handshake.  
%DP1 Read and store line probe information from DSP during handshake.  
Command:  
Values:  
>DTn DTMF Detection  
n = 0 or 1  
Default:  
0
Description:  
>DT0 The modem will not detect DTMF tones.  
>DT1 The modem will detect and report DTMF tones when it is off-hook.  
Command:  
Values:  
En Echo Command Mode Characters  
n = 0 or 1  
Default:  
1
Description:  
E0 Do not echo keyboard input to the terminal.  
E1 Do echo keyboard input to the terminal.  
Command:  
Values:  
&En V.42 Error Correction Modes  
n = 0, 1, or 2  
Default:  
1
Description:  
&E0 V.42 non-error correction mode (V.42 disabled).  
&E1 V.42 auto-reliable mode.  
&E2 V.42 reliable mode (V.42 enabled).  
Command:  
Values:  
&En Modem-Initiated Flow Control  
n = 3, 4, or 5  
Defaults:  
4
Description:  
&E3 Flow control disabled.  
&E4 CTS/RTS hardware flow control.  
&E5 XON/XOFF software flow control.  
Command:  
Values:  
&En XON/XOFF Pass-Through  
n = 6 or 7  
Defaults:  
6
Description:  
&E6 Respond to and discard XON/XOFF characters when &E5 is selected.  
&E7 Respond to and pass through XON/XOFF characters when &E5 is selected.  
Command:  
Values:  
&En Hewlett Packard ENQ/ACK Pacing  
n = 8 or 9  
Default:  
8
Description:  
&E8 Ignore ENQ/ACK pacing characters.  
&E9 Respond to ENQ/ACK pacing characters.  
Command:  
Values:  
&En Non-Error Correction Mode Flow Control  
n = 10 or 11  
Default:  
10  
Description:  
&E10 Disable non-error correction mode flow control.  
&E11 Enable non-error correction mode flow control.  
Command:  
Values:  
&En Pacing (Computer-Initiated Flow Control)  
n = 12 or 13  
Default:  
13  
Description:  
&E12 Pacing disabled.  
&E13 Pacing enabled.  
Command:  
Values:  
&En Data Compression  
n = 14 or 15  
Default:  
15  
Description:  
&E14 Data compression disabled.  
&E15 Data compression enabled.  
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Chapter 3 – AT Commands, S-Registers, and Results Codes  
Command:  
Values:  
$En V.42 Error Correction at 300 bps  
n = 0 or 1  
Default:  
0
Description:  
$E0 V.42 error correction at 300 bps disabled.  
$E1 V.42 error correction at 300 bps enabled.  
Command:  
Values:  
$EBn Asynchronous Word Length  
n = 0 or 1  
Default:  
0
Description:  
$EB0 10-bit mode enabled.  
$EB1 11-bit mode enabled.  
Command:  
Values:  
%En Escape Sequence Options  
n = 0–5  
Defaults:  
1 and 4  
Description:  
%E0 Modem won’t escape.  
%E1 +++AT<CR> method.  
%E2 <BREAK>AT<CR> method.  
%E3 Both +++AT<CR> and <BREAK>AT<CR> methods.  
%E4 No OK response to +++AT<CR>.  
%E5 OK response to +++AT<CR>.  
Command:  
Values:  
&Fn Load Default Configurations  
n = 0, 8, or 9  
Default:  
8
Description:  
&F0 Load factory default values from ROM if &F8 was previously stored; load user default values  
from non-volatile memory if &F9 was previously stored.  
&F8 Read factory default values when &F is issued (effective only if you store &F8 using &W0).  
&F9 Read values stored in non-volatile memory when &F is issued (effective only if you store &F9  
using &W0).  
Command:  
Values:  
$Fn Enable/Disable Auto-Reliable Fallback Character  
n = 0 or 1  
Default:  
0
Description:  
$F0 Do not fall back to non-error correction mode connect if <CR> is received during handshake.  
$F1 Fall back to non-error correction mode connect if <CR> is received during handshake.  
Command:  
Values:  
%Fn Echo Frequency Canceller Offset Compensation  
n = 0 or 1  
Default:  
0
Description:  
%F0 Disable echo canceller frequency offset compensation.  
%F1 Enable echo canceller frequency offset compensation.  
Command:  
Values:  
#Fn Fallback Modes When Online  
n = 0, 1, or 2  
Default:  
2
Description:  
#F0 No fallback when on line.  
#F1 Fallback decrementally from maximum speed to 4800 bps as line conditions deteriorate.  
#F2 Fallback decrementally to 4800 bps; fall forward when line conditions improve.  
Command:  
Values:  
&Gn Guard Tones  
n = 0, 1, or 2  
Default:  
0
Description:  
&G0 Turn off ITU-T guard tones.  
&G1 Turn on ITU-T 550 Hz guard tone.  
&G2 Turn on ITU-T 1800 Hz guard tone.  
Note: The ZDXK is locked to the ITU-T 1800 Hz guard tone (&G2).  
Command:  
Values:  
Hn On Hook/Off Hook  
n = 0 or 1  
Default:  
None  
Description:  
H0 Go on hook (hang up).  
H1 Go off hook.  
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Chapter 3 – AT Commands, S-Registers, and Results Codes  
Command:  
Values:  
$Hn Help Screens  
n = 1, 2, or 3  
Default:  
None  
Description:  
$H1 Display Help Screen #1.  
$H2 Display Help Screen #2.  
$H3 Display Help Screen #3.  
Command:  
Values:  
In Inquire Product Codes  
n = 0, 1, or 2  
Default:  
None  
Description:  
I0 Display modem ID number.  
I1 Display firmware version number.  
I2 Display modem description.  
Command:  
Values:  
$Jn Display Parity Bit  
n = 0, 1  
Default:  
0
Description:  
The $J command allows the parity bit to be seen when XON/OFF flow control is enabled (see the  
&E command.)  
$J0 disables the display of the parity bit to be seen when XON/XOFF flow control is enabled.  
$J1 enables the display of the parity bit to be seen when XON/XOFF flow control is enabled.  
Command:  
Values:  
Ln List Commands  
n = 0, 5–8  
Default:  
None  
Description:  
L List stored telephone numbers.  
L5 List current operating parameters.  
L6 List current S-register values.  
L7 List additional current operating parameters.  
L8 List DSP code version number, processor speed, and online diagnostic parameters.  
L9 List signal strength information.  
L10 List signal to noise ratio information (SNR).  
L11 List noise information.  
Note: For L9, L10, and L11, you must first type +++AT<CR> (online escape command while  
maintaining command mode), then type the command prefixed by an AT (e.g., ATL10).  
Command:  
Values:  
#Ln  
n = 0, 1, 2, or 3  
V.42 Mode Selection in Originate Mode  
Default:  
0
Description:  
#L0 Modems negotiate V.42 mode.  
#L1 MNP on & LAP-M off.  
#L2 LAP-M on & MNP off.  
#L3 Disable detection phase and go directly to LAP-M.  
Command:  
Values:  
Mn Modem Speaker Control  
n = 0, 1, 2, or 3  
Default:  
1
Description:  
M0 Speaker always off.  
M1 Speaker on until carrier signal detected.  
M2 Speaker always on.  
M3 Speaker on during dialing, off during handshaking.  
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Chapter 3 – AT Commands, S-Registers, and Results Codes  
Command:  
Values:  
$MBn Modem Baud Rate  
n = speed  
Default:  
28800 (ZDX) or 33600 (ZDXb)  
Description:  
$MB300 Originate call at 300 bps.  
$MB1200 Originate call at 1200 bps.  
$MB2400 Originate call at 2400 bps.  
$MB4800 Originate call at 4800 bps.  
$MB7200 Originate call at 7200 bps.  
$MB9600 Originate call at 9600 bps.  
$MB14400 Originate call at 14,400 bps.  
$MB16800 Originate call at 16, 800 bps.  
$MB19200 Originate call at 19,200 bps.  
$MB28800 Originate call at 28,800 bps.  
$MB33600 Originate call at 33,600 bps (ZDXb only).  
Command:  
Values:  
Nd Dial a Stored Number  
d = 0 or 1  
Default:  
None  
Description:  
Dial stored telephone number d.  
Command:  
Values:  
NdNe. .. Number Linking  
d = 0 or 1; e = 1 or 0  
Default:  
None  
Description:  
Dial stored number d; if it is busy, dial stored number e.  
Command:  
Values:  
O
n/a  
Go Back Online  
Description:  
Return to online mode after you have used an escape sequence to go from online mode to  
command mode.  
Command:  
Values:  
Default:  
P
n/a  
Yes  
Pulse Dial  
Description:  
The modem pulse-dials numbers that follow P in the dialing command.  
Command:  
Values:  
&Pn Set Pulse Dial Ratios  
n = 0 or 1  
Default:  
0
Description:  
&P0 60:40 break/make pulse ratio.  
&P1 67:33 break/make pulse ratio.  
Note: The ZDXK is locked to a 67:33 pulse ratio (&P1).  
Command:  
Values:  
Qn Result Codes Enable/Disable  
n = 0, 1, or 2  
Default:  
0
Description:  
Q0 Enable result codes.  
Q1 Disable result codes (quiet).  
Q2 Enable no-response answer mode, which leaves originate mode intelligent while turning off  
answer mode responses and echo.  
Command:  
Values:  
&Qn Multi-Tech or Standard Result Codes  
n = 0 or 1  
Default:  
0
Description:  
&Q0 Multi-Tech responses with modifiers.  
&Q1 Standard AT responses with no modifiers.  
Command:  
Values:  
Rn Reverse Originate/Answer Modes  
n = 0 or 1  
Default:  
0
Description:  
R0 Modem will not reverse modes.  
R1 Modem will reverse modes when R is added to the dial string.  
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Command:  
Values:  
Default:  
&Rn Clear to Send Control  
n = 0, 1, or 2  
1
Description:  
&R0 Let CTS state follow RTS state when on line.  
&R1 Force CTS high (on).  
&R2 Let CTS drop on disconnect for time set by S24, then go high again.  
Command:  
Values:  
&RAn Asymmetrical Bit Rate  
n = 0 or 1  
Default:  
0
Description:  
&RA0 Enable asymmetrical bit rate in V.34 mode.  
&RA1 Disable asymmetrical bit rate in V.34 mode.  
Command:  
Values:  
&RDn Square Wave Ring Detect  
n = 0 or 1  
Default:  
1
Description:  
&RD0 Modem detects only sine wave rings.  
&RD1 Modem detects both sine and square wave rings.  
Command:  
Values:  
&RFn CTS/RTS Interaction Control  
n = 0 or 1  
Default:  
1
Description:  
&RF0 Let CTS follow RTS.  
&RF1 Let CTS act independently (use with &R).  
Command:  
Values:  
&RN Rate Negotiation  
n/a  
Description:  
Forces the modem to perform a rate renegotiation while on line. You must escape to command  
mode to issue this command.  
Command:  
Values:  
&RP Immediate Line Probe  
n/a  
Description:  
Initiates a retrain that makes the processor read line probe information if %DP1 is selected. Valid  
only when on line in V.34 mode.  
Command:  
Values:  
&RR Immediate Retrain  
n/a  
Description:  
Forces the modem to perform an immediate retrain while on line. You must escape to command  
mode to issue this command.  
Command:  
Values:  
$Rn Retransmit Count  
n = 0 or 1  
Default:  
0
Description:  
$R0 Disconnect after 50 retransmits of a data block.  
$R1 Do not disconnect after 50 retransmits.  
Command:  
Values:  
Sr=n Set Register Value  
r = S-register number; n varies  
Default:  
None  
Description:  
Set value of register S r to value of n, where n is entered in decimal format.  
Command:  
Values:  
Sr? Read Register Value  
r = S-register number  
Default:  
None  
Description:  
Read value of register S r and display value in 3- digit decimal form.  
Command:  
Values:  
&Sn Data Set Ready Control  
n = 0, 1, or 2  
Default:  
1
Description:  
&S0 Force DSR high (on).  
&S1 Let DSR follow CD.  
&S2 DSR drops on disconnect, then goes high again. (Used by some CBX phone systems.)  
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Chapter 3 – AT Commands, S-Registers, and Results Codes  
Command:  
Values:  
&SFn DSR/CD Interaction Control  
n = 0 or 1  
Default:  
0
Description:  
&SF0 Select DSR to follow CD.  
&SF1 Select DSR to be independent.  
Command:  
Values:  
$SBn Serial Port Baud Rate  
n = speed  
Default:  
57600  
Description:  
$SB300 Set serial port to 300 bps.  
$SB1200 Set serial port to 1200 bps.  
$SB2400 Set serial port to 2400 bps.  
$SB4800 Set serial port to 4800 bps.  
$SB9600 Set serial port to 9600 bps.  
$SB19200 Set serial port to 19200 bps.  
$SB38400 Set serial port to 38400 bps.  
$SB57600 Set serial port to 57600 bps.  
$SB115200 Set serial port to 115200 bps.  
Note: Baud adjust must be off ($BA0) to enable fixed baud rate.  
Command:  
Values:  
T
n/a  
Tone-Dial  
Default:  
P command  
Description:  
Modem will tone-dial numbers following a T in the dialing command.  
Command:  
Values:  
&Tn Respond to Remote Digital Loopback Signal  
n = 4 or 5  
Default:  
5
Description:  
&T4 Enable response to remote digital loopback signal.  
&T5 Disable response to remote digital loopback signal.  
Command:  
Values:  
#Tn Trellis-Coded Modulation  
n = 0 or 1  
Default:  
1
Description:  
#T0 Disable trellis-coded modulation.  
#T1 Enable trellis-coded modulation.  
Command:  
Values:  
Un Loopback Test Modes  
n = 0, 1, 2, or 3  
Default:  
None  
Description:  
U0 Enable local nalog loopback originate mode.  
U1 Enable local analog loopback answer mode.  
U2 Enable remote digital loopback mode.  
U3 Enable local digital loopback mode.  
Command:  
Values:  
Vn Result Codes (Verbose/Terse)  
n = 0 or 1  
Default:  
1
Description:  
V0 Result codes sent as digits (terse response).  
V1 Result codes sent as words (verbose response).  
Command:  
Values:  
#Vn V.32terbo Handshake Tones  
n = 0 or 1  
Default:  
1
Description:  
#V0 Include V.32terbo tones in handshake.  
#V1 Exclude V.32terbo tones from handshake.  
Command:  
Values:  
W
n/a  
Wait for New Dial Tone  
Description:  
Inserted in dialing command, causes modem to wait for a new dial tone. (X2 or X4 must be  
selected.)  
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Chapter 3 – AT Commands, S-Registers, and Results Codes  
Command:  
Values:  
Default:  
&Wn Store Configuration  
n = 0 or 1  
1
Description:  
&W0 Store current settings in NVRAM; load them at power-on or following the ATZ command  
instead of loading the factory defaults from ROM.  
W1 Clear user default settings from NVRAM.  
Command:  
Values:  
Xn Result Codes and Call Progress Selection  
n = 0–4  
Default:  
0
Description:  
X0 Basic result codes ( CONNECT only); does not look for dial tone or busy signal.  
X1 Extended result codes ( CONNECT 28800, CONNECT 33600, etc.); does not look for dial tone  
or busy signal.  
X2 Extended result codes with NO DIALTONE; does not look for busy signal.  
X3 Extended result codes with BUSY; does not look for dial tone.  
X4 Extended result codes with NO DIALTONE and BUSY.  
Command:  
Values:  
#Xn Number of XOFF Characters Sent  
n = 0 or 1  
Default:  
0
Description:  
#X0 Single XOFF character sent after buffer is full.  
#X1 Multiple XOFF characters sent (one for every character received after buffer is full).  
Command:  
Values:  
Yn Long Space Disconnect  
n = 0 or 1  
Default:  
0
Description:  
Y0 Disable sending or responding to long space break signal on disconnect.  
Y1 Enable sending or responding to long space break signal on disconnect. (Both modems must  
have Y1 set.)  
Command:  
Values:  
Z
n/a  
Modem Reset  
Description:  
Reset modem to default values. Defaults come from user NVRAM if &W0 is set, from factory ROM  
if &W1 is set.  
Command:  
Values:  
,
Dialing Pause  
n/a  
Description:  
Placed in dialing command, comma causes dialing pause for time set by S8.  
Command:  
Values:  
:
Continuous Redial  
n/a  
Description:  
Placed at end of dial command, a colon causes continuous redial of a number (10 in DOC  
modems) until answered. Not used in ZDXK or ZDXI modems.  
Command:  
Values:  
;
Return to Command Mode  
n/a  
Description:  
Placed at end of dial command, a semicolon causes an immediate return to command mode after  
dialing.  
Command:  
Values:  
!
Flash On-Hook  
n/a  
Description:  
Placed in dial command, exclamation point causes modem to flash on-hook.  
Command:  
Values:  
@
n/a  
Quiet Answer  
Description:  
Placed in dial command, @ causes modem to wait for a ringback, then 5 seconds of silence, before  
processing next part of command.  
Command:  
Values:  
$
n/a  
Call Card Tone Detect  
Description:  
Placed in dial command, causes modem to wait for a call card tone before processing next part of  
command (such as a call card number).  
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Chapter 3 – AT Commands, S-Registers, and Results Codes  
Command:  
Values:  
%%%AT<CR> Remote Configuration Escape Sequence  
n/a  
Description:  
Initiates remote configuration mode while online with remote modem. The remote configuration  
escape character (%) is defined in register S13.  
Command:  
Values:  
+++AT<CR> Escape Code  
n/a  
Description:  
Puts modem in command mode (and optionally issues a command) while remaining on line.  
Enter +++AT, up to ten command characters (or as defined by S34), and a RETURN. Used mostly  
to issue hang-up command: +++ATH<CR>.  
Command:  
Values:  
<BREAK>AT<CR> Escape Sequence  
n/a  
Description:  
Alternate escape method. Puts modem in command mode while remaining on line. Send a  
<BREAK> signal followed by AT, up to sixty command characters, and a RETURN. You must set  
the modem to %E2 or %E3 before you can use this escape method.  
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Chapter 3 – AT Commands, S-Registers, and Results Codes  
S-Registers  
Certain modem values, or parameters, are stored in memory locations called S-registers. Use the S command to  
read or to alter the contents of S-Registers (see previous section).  
Register Unit Range Default Description  
Register Unit  
Range Default Description  
S0  
1 ring  
0, 1–255  
1
Sets the number of rings until the modem answers. ATS0=0  
disables autoanswer completely.  
S1  
S2  
S3  
S4  
S5  
S6  
1 ring  
0–255  
0
Counts the rings that have occurred.  
Sets ASCII code for the escape code character.  
decimal 0–127  
decimal 0–127  
decimal 0–127  
decimal 0–127  
43(+)  
13 (^M) Sets ASCII code for the RETURN character.  
10 (^J) Sets ASCII code for the LINE FEED character.  
8 (^H) Sets ASCII code for the BACKSPACE character.  
1 sec.  
2–255  
2
Sets the time the modem will wait for a dial tone before aborting a  
call.  
S7  
S8  
1 sec.  
1 sec.  
1–255  
0–255  
45  
2
Sets the time the modem.  
Sets the length of a pause caused by a comma character in a  
dialing command.  
S9  
100 ms  
100 ms  
1–255  
1–254  
6
7
Sets delay between when the modem detects a valid carrier  
signal and when it turns on its CD circuit.  
Sets how long a carrier signal must be lost before the modem  
disconnects. S10=255 causes the modem to not disconnect with  
loss of carrier.  
S10  
S11  
S13  
S17  
S24  
S25  
S30  
1 ms  
1–255  
70  
Sets spacing and duration of dialing tones. Recommended  
minimum is 50 ms.  
decimal 0, 1–127 37 (%) Sets ASCII code for remote configuration escape character.  
S13=0 disables remote configuration.  
Sets the length of the break time (space) sent to the local PC  
when the modem receives a remote break.  
Sets the time the DSR, CTS, and CD signals drop before going  
high again. Used for some PBX and CBX phone systems.  
Sets the time the DTR signal must be dropped before the modem  
disconnects. The 0 default equals 50 ms.  
Sets how long the modem waits after the last character is  
received or transmitted before it disconnects. The 0 default  
disables the timer.  
10 ms  
50 ms  
100 ms  
1 min.  
1–255  
25  
20  
0
0–255  
0, 1–255  
0, 1–255  
0
S32  
100 ms  
0–255  
20  
Sets the time the modem will wait for a RETURN to be entered  
during escape sequence execution.  
S34  
S36  
1 char  
1 sec.  
0–60  
0, 1-255  
10  
5
Sets the number of command characters allowed after +++AT.  
Sets the time between DTR inactive and modem offhook. S36=0  
disables DTR busy-out.  
S37  
S43  
1 sec.  
decimal 28, 26,  
24, 21,  
0-255  
5
0
Sets the time between DTR active and modem on-hook.  
Sets fixed V.34 connect speed. 28 = 28800 bps; 26 = 26400 bps;  
48 = 4800 bps. 0 default disables this feature.  
19, 16,  
14, 12,  
96, or 48  
decimal 33, 31,  
28, 26,  
S48  
0
Sets maximum V.34 connect speed. 33 = 33600 bps; 31 = 31200  
bps;…48 = 4800 bps. 0 default disables feature (same as  
S48=33).  
24, 21,  
19, 16,  
14, 12,  
96, or 48  
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Chapter 3 – AT Commands, S-Registers, and Results Codes  
Result Codes  
In command mode the MT2834ZDX can send responses, or result codes, to your computer. Result codes are used  
by communications programs and can also appear on your monitor.  
AT&Q0 selects Multi-Tech result codes with RELIABLE, LAPM, and COMPRESSED modifiers (default).  
AT&Q1 selects standard AT result codes without modifiers.  
&Q0 Multi-Tech Result Codes &Q1 Standard Result Codes Description  
Terse  
Verbose  
Terse Verbose  
0
1
2
3
OK  
CONNECT  
RING  
0
1
2
3
OK  
CONNECT  
RING  
Command executed without error  
Modem has detected carrier and gone online  
Modem has detected ring from incoming call  
No carrier has been signal detected within  
allowed time  
NO CARRIER  
NO CARRIER  
4
ERROR  
4
5
ERROR  
Error in command line (too many  
characters or invalid characters  
Modem has detected carrier at 2400bps  
and gone online  
5 *  
CONNECT 1200  
CONNECT 1200  
6
7
8
9
NO DIALTONE  
BUSY  
NO ANSWER  
CONNECT 2400  
6
7
8
NO DIALTONE  
BUSY  
NO ANSWER  
No dial tone detected  
A busy signal detected  
Remote system did not answer  
Modem had detected carrier at 2400 bps  
and gone online  
10  
11  
12  
13  
13  
16  
19  
21  
24  
26  
28  
31  
32  
CONNECT 2400  
CONNECT 4800  
CONNECT 9600  
CONNECT 12000  
CONNECT 14400  
CONNECT 16800  
CONNECT 19200  
CONNECT 21600  
CONNECT 24000  
CONNECT 26400  
CONNECT 28800  
CONNECT 31200  
CONNECT 33600  
Modem had detected carrier at 2400 bps  
and gone online  
Modem had detected carrier at 4800 bps  
and gone online  
Modem had detected carrier at 9600 bps  
and gone online  
Modem had detected carrier at 12000 bps  
and gone online  
Modem had detected carrier at 14400 bps  
and gone online  
Modem had detected carrier at 16800 bps  
and gone online  
Modem had detected carrier at 19200 bps  
and gone online  
Modem had detected carrier at 21600 bps  
and gone online  
Modem had detected carrier at 24000 bps  
and gone online  
Modem had detected carrier at 26400 bps  
and gone online  
Modem had detected carrier at 28800 bps  
and gone online  
Modem had detected carrier at 31200 bps  
and gone online  
11 *  
12 *  
13  
CONNECT 4800  
CONNECT 9600  
CONNECT 12000  
CONNECT 14400  
CONNECT 16800  
CONNECT 19200  
CONNECT 21600  
CONNECT 24000  
CONNECT 26400  
CONNECT 28800  
CONNECT 31200  
CONNECT 33600  
13 *  
16  
19 *  
21 *  
24 *  
26 *  
28 *  
31 *  
33 *  
Modem had detected carrier at 33600 bps  
and gone online  
*With error correction on, RELIABLE (or R) or LAPM (or L) is added to these result codes. With data compression on,  
COMPRESSED (or C) is added.  
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Chapter 4 – Troubleshooting  
Chapter 4 – Troubleshooting  
Your MultiModemZDX modem was thoroughly tested at the factory before it was shipped. If you are unable to make a  
successful connection, or if you experience data loss or garbled characters during your connection, it is possible that  
the modem is defective. However, it is more likely that the source of your problem lies elsewhere. The following  
symptoms are typical of problems you may encounter:  
None of the LEDs light when the modem is on.  
The modem does not respond to commands.  
The modem dials but cannot connect.  
The modem disconnects while online.  
The modem cannot connect when answering.  
File transfer is slower than it should be.  
Data is being lost.  
There are garbage characters on the monitor.  
Fax and data programs can’t run at the same time.  
If you experience problems, please check the following possibilities before calling Technical Support  
(see Appendix C).  
None of the LEDs Light When the Modem Is On  
When you turn on the ZDX, the LED indicators on the front panel should flash briefly as the modem runs a self-  
test. If the LEDs remain off, the modem is probably not receiving power.  
Make sure the modem’s power switch is on, especially if you normally turn on the modem by turning on a  
power strip.  
If the power supply is plugged into a power strip, make sure the power strip is plugged in and its power  
switch is on. Make sure the power supply module is firmly connected to the modem and to the wall outlet or  
power strip.  
If the power strip is on and the modem switch is on, try moving the modem power supply to another outlet on  
the power strip.  
Test that the outlet is live by plugging a lamp into it.  
The modem or power supply may be defective. If you have another Multi-Tech modem, try swapping  
modems. If the problem goes away, the first modem or power supply may be defective. Call Technical  
Support for assistance.  
CAUTION: Do not under any circumstance replace the power supply module with one designed for another  
product, as it can damage the modem and void your warranty.  
The Modem Does Not Respond to Commands  
Make sure the modem is plugged in and turned on. (See “None of the Indicators Light when the Modem Is  
On.”)  
Make sure you are issuing the modem commands from a data communication program, either manually in  
terminal mode or automatically by configuring the program. (You cannot send commands to the modem  
from the DOS prompt.)  
Make sure you are in terminal mode in your data communication program, then type AT and press ENTER.  
If you get an OK response, your connections are good, and the problem likely is in the connection setup in  
your communication program.  
Try resetting your modem by turning it off and on.  
If you don’t get an OK, the problem may still be in the communication program. Make sure you have done  
whatever is necessary in your software to make a port connection. Not all communication programs connect  
to the COM port automatically. Some connect when the software loads and remain connected until the  
program terminates. Others can disconnect without exiting the program. The modem’s TR indicator lights to  
show that the software has taken control of the modem through the COM port.  
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Chapter 4 – Troubleshooting  
Your communication program settings might not match the physical port the modem is connected to. The  
serial cable might be plugged into the wrong connector—check your computer documentation to make sure.  
Or you might have selected a COM port in the program other than the one the modem is physically  
connected to—compare the settings in the program to the physical connection.  
If the modem is on, the cable is plugged into the correct port, the communication program is configured  
correctly, and you still don’t get an OK, the fault might be in the serial cable. Make sure it is firmly connected  
at both ends.  
Is this the first time you have used the cable? If so, it may not be wired correctly. Check the cable  
description on the package to make sure the cable is the right one for your computer.  
Peripheral expansion cards, such as sound and game cards, can include a serial port preconfigured as  
COM1 or COM2. The extra serial port, or the card itself, may use the same COM port, memory address, or  
interrupt request (IRQ) as your communications port. Be sure to disable any unused ports.  
If you use Windows 98, right-click on My Computer, select Properties from the menu, click on the Device  
Manager tab, double-click on Ports, then double-click the communications port your modem is connected  
to. In the port’s Properties dialog box, click the Resources tab to see the port’s input/output range and  
interrupt request. If another device is using the same address range or IRQ, it will appear in the Conflicting  
Device List. Uncheck Use automatic settings to change the port’s settings so they do not conflict with the  
other device, or select the port the conflicting device is on, and change it instead. If you need to open your  
computer to change switches or jumpers on the conflicting device; refer to the documentation for the device.  
If you use Windows NT 4.0, select in turn Start, Programs, Administrative Tools (Common), and  
Windows NT Diagnostics. In the Windows NT Diagnostics dialog box, click on the Resources tab to see  
address and IRQ assignments.  
The serial port might be defective. If you have another serial port, install the modem on it, change the COM  
port setting in your software, and try again.  
The modem might be defective. If you have another Multi-Tech modem, try swapping modems. If the  
problem goes away, the first modem is possibly defective. Call Technical Support for assistance (see  
Appendix C).  
The Modem Dials But Cannot Connect  
There can be several reasons the ZDX fails to make a connection.  
Possibilities include:  
Lack of a physical connection to the telephone line.  
A wrong dial tone.  
A busy signal.  
A wrong number.  
No modem at the other end.  
A faulty modem, computer, or software at the other end.  
Incompatibility between modems.  
You can narrow the list of possibilities by using extended result codes. Extended result codes are enabled by  
default. If they have been disabled, include V1X4 in the modem’s initialization string, or in terminal mode enter  
ATV1X4 and press ENTER. When you dial again, the modem will report the call’s progress.  
If the modem reports NO DIALTONE, check that the modem’s telephone line cable is connected to both the  
modem’s LINE jack (not the PHONE jack) and the telephone wall jack. If the cable looks secure, try  
replacing it. If that doesn’t work, the problem might be in your building’s telephone installation. To test the  
building installation, plug a telephone into your modem’s telephone wall jack and listen for a dial tone. If you  
hear a dial tone, your modem might be installed behind a company phone system (PBX) with an internal dial  
tone that sounds different from the normal dial tone. In that case, the modem might not recognize the dial  
tone and might treat it as an error. Make sure your modem’s square wave ring detection is turned on  
(&RD1). Check the PBX manual to see if you can change the internal dial tone; if you can’t, change your  
modem’s initialization string to replace X4 with X3, which will cause the modem to ignore dial tones.  
If the modem reports BUSY, the other number might be busy, in which case you should try again later, or it  
might indicate that you have failed to add a 9, prefix to the phone number if you must dial 9 for an outside  
line. If you must dial 9 to get an outside line, the easiest way to dial it automatically is to include it in the  
modem’s dial prefix, e.g., ATDT9,. Note the comma, which inserts a pause before the number is dialed. By  
inserting 9, into the dial prefix, you do not have to include it in each directory entry. To change the dial prefix  
in Windows 95 HyperTerminal, select Connect from the Call menu, click Dialing Properties, and type 9 in  
the local and long distance boxes in How I dial from this location.  
If the modem reports NO ANSWER, the other system has failed to go off-hook, or you might have dialed a  
wrong number. Check the number.  
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Chapter 4 – Troubleshooting  
If the modem reports NO CARRIER, the phone was answered at the other end, but no connection was  
made. You might have dialed a wrong number, and a person answered instead of a computer, or you might  
have dialed the correct number but the other computer or software was turned off or faulty. Check the  
number and try again, or try calling another system to make sure your modem is working. Also, try calling  
the number on your telephone. If you hear harsh sounds, then a modem is answering the call, and the  
modems might be having problems negotiating because of modem incompatibilities or line noise. Try  
connecting at a lower speed.  
The Modem Disconnects While Online  
If you have Call Waiting on the same line as your modem, it can interrupt your connection each time  
someone tries to call you. If you have Call Waiting, disable it before each call. In most telephone areas in  
North America, you can disable Call Waiting by preceding the telephone number with *70 (check with your  
local telephone company). You can automatically disable Call Waiting by including the disabling code in the  
modem’s dial prefix (e.g., ATDT*70,—note the comma, which inserts a pause before the number is dialed).  
To change the dial prefix in Windows Terminal, select Settings | Modem Commands. To change it in  
HyperTerminal, select Connect from the Call menu, click Dialing Properties, check This location has Call  
Waiting, and select the correct code for your phone service.  
If you have extension phones on the same line as your modem, you or someone else can interrupt the  
connection by picking up another phone. If this is a frequent problem, disconnect the extension phones  
before using the modem, or order a separate line for the modem.  
Check for loose connections between the modem and the computer, the telephone jack, and AC power.  
You might have had a poor connection because of line conditions or the problem might have originated on  
the other end of the line. Try again.  
The Modem Cannot Connect When Answering  
Autoanswer might be disabled. Turn on autoanswer in your datacomm program or send the command  
ATS0=1 to your modem in terminal mode.  
File Transfer Is Slower Than It Should Be  
You might have an older UART. For best throughput, install a 16550AFN UART or a Multi-Tech ISI serial  
port card.  
If you are using a slow transfer protocol, such as Xmodem or Kermit, try Zmodem or Ymodem/G instead.  
Is your line noisy? If there is static on your line, the modem has to resend many blocks of data to insure  
accuracy. You must have a clean line for maximum speed.  
Are you downloading a compressed file with MNP 5 hardware compression enabled? Since hardware data  
compression cannot compress a file already compressed by an archiving program, the transfer can be  
marginally slower with data compression enabled than with it disabled.  
Try entering the L8 (List Online Diagnostics) command in online mode, making a screen print of the  
diagnostics listing, and checking for parameters that may be unacceptable (number of retrains, round trip  
delay, etc.).  
Data Is Being Lost  
If you are using data compression and a high speed serial port, set the serial port baud rate to four times the  
data rate.  
Your UART might not be reliable at serial port speeds over 9600 bps or 19,200 bps. Turn off data  
compression, reset your serial port speed to a lower rate, or replace your serial port with a faster one.  
Make sure the flow control method you selected in software matches the method selected in the modem. If  
you are using the modem with a Macintosh, you might have the wrong cable for hardware flow control.  
Try entering the L8 (List Online Diagnostics) command in online mode, making a screen print of the  
diagnostics listing, and checking for parameters that may be unacceptable (number of retrains, round trip  
delay, etc.).  
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Chapter 4 – Troubleshooting  
There Are Garbage Characters on the Monitor  
Your computer and the remote computer might be set to different word lengths, stop bits, or parities. If you  
have connected at 8-N-1, try changing to 7-E-1, or vice-versa, using your communication software.  
4 You might be experiencing line noise. Enable error correction, if it is disabled, or hang up and call again;  
you might get a better connection the next time.  
At speeds above 2400 bps, the remote modem might not use the same transmission or error correction  
standards as your modem. Try connecting at a slower speed or disabling error correction. (With no error  
correction, however, line noise can cause garbage characters.)  
Try entering the L8 (List Online Diagnostics) command in online mode, making a screen print of the  
diagnostics listing, and checking for parameters that may be unacceptable (number of retrains, round trip  
delay, etc.).  
Fax and Data Programs Can’t Run at the Same Time  
Communications devices can be accessed by only one application at a time. In Windows 95, 98, and NT  
4.0, you can have separate data and fax communication applications open at the same time, but they cannot  
use the same modem at the same time.  
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Appendix A – Regulatory Compliance  
Appendix A – Regulatory Compliance  
Regulatory Compliance  
Regulatory Requirements for the United States  
FCC CFR47 Part 15 Regulation  
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to  
47 CFR Part 15 regulations. The stated limits in this regulation are designed to provide reasonable  
protection against harmful interference in a residential installation. This equipment generates, uses, and can  
radiate radio frequency energy, and if not installed and used in accordance with the instructions, may cause  
harmful interference to radio communications. However, there is no guarantee that interference will not  
occur in a particular installation. If this equipment does cause harmful interference to radio or television  
reception, which can be determined by turning the equipment off and on, the user is encouraged to try to  
correct the interference by one or more of the following measures:  
Reorient or relocate the receiving antenna.  
Increase the separation between the equipment and receiver.  
Plug the equipment into an outlet on a circuit different from that to which the receiver is connected.  
Consult the dealer or an experienced radio/TV technician for help.  
This device complies with Part 15 of the CFR 47 rules. Operation of this device is subject to the following  
conditions: (1) This device may not cause harmful interference, and (2) this device must accept any  
interference that may cause undesired operation.  
WARNING – Changes or modifications to this unit not expressly approved by the party responsible for  
compliance could void the user’s authority to operate the equipment.  
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Appendix A – Regulatory Compliance  
FCC CFR47 Part 68 Telecom  
1. This equipment complies with Part 68 of the 47 CFR rules and the requirements adopted by the ACTA.  
Located on this equipment is a label that contains, among other information, the registration number  
and ringer equivalence number (REN) for this equipment or a product identifier in the format:  
For current products is US:AAAEQ##Txxxx.  
For legacy products is AU7USA-xxxxx-xx-x.  
If requested, this number must be provided to the telephone company.  
2. A plug and jack used to connect this equipment to the premises wiring and telephone network must  
comply with the applicable 47 CFR Part 68 rules and requirements adopted by the ACTA. It’s designed  
to be connected to a compatible modular jack that is also compliant.  
3. The ringer equivalence number (REN) is used to determine the number of devices that may be  
connected to a telephone line. Excessive RENs on a telephone line may result in the devices not ringing  
in response to an incoming call. In most but not all areas, the sum of RENs should not exceed five (5.0).  
To be certain of the number of devices that may be connected to a line, as determined by the total  
RENs, contact the local telephone company. For products approved after July 23, 2001, the REN for  
this product is part of the product identifier that has the format US:AAAEQ##Txxxx. The digits  
represented by ## are the REN without a decimal point (e.g., 03 is a REN of 0.3). For earlier products,  
the REN is separately shown on the label.  
4. If this equipment causes harm to the telephone network, the telephone company will notify you in  
advance that temporary discontinuance of service may be required. But if advance notice isn't practical,  
the telephone company will notify the customer as soon as possible. Also, you will be advised of your  
right to file a complaint with the FCC if you believe it is necessary.  
5. The telephone company may make changes in its facilities, equipment, operations or procedures that  
could affect the operation of the equipment. If this happens, the telephone company will provide  
advance notice in order for you to make necessary modifications to maintain uninterrupted service.  
6. If trouble is experienced with this equipment, please contact Multi-Tech Systems, Inc. at the address  
shown below for details of how to have the repairs made. If the equipment is causing harm to the  
telephone network, the telephone company may request that you disconnect the equipment until the  
problem is resolved.  
7. Connection to party line service is subject to state tariffs. Contact the state public utility commission,  
public service commission or corporation commission for information.  
8. No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its licensees.  
Unauthorized repairs void registration and warranty.  
9. If your home has specially wired alarm equipment connected to the telephone line, ensure the  
installation of this equipment does not disable your alarm equipment.  
If you have questions about what will disable alarm equipment, consult your telephone company or a  
qualified installer.  
10. Connection to party line service is subject to state tariffs. Contact the state public utility commission,  
public service commission or corporation commission for information.  
11. This equipment is hearing aid compatible.  
12. Manufacturing Information:  
Manufacturer: Multi-Tech Systems, Inc.  
Model Number: MT2834ZDX, MT2834ZDXb  
FCC Registration Number: AU7USA-20673-MM-E  
Ringer Equivalence Number: 0.3B  
Modular Jack (USOC): RJ11C or RJ11W (single line)  
Service Center in USA: Multi-Tech Systems, Inc.  
2205 Woodale Drive  
Mounds View, MN 55112  
(763) 785-3500  
(763) 785-9874 Fax  
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Appendix A – Regulatory Compliance  
Current Requirements for Label Content and Format  
Approved terminal equipment and approved protective circuitry shall prominently display the following  
information using the format shown below:  
Responsible party  
Product Identification  
Equipment Code  
Ringer Equivalence  
Ringer Type  
Indication that the product meets the requirements of 47 CFR Part 68  
The information required by the first five items shall correspond to the records in the ACTA database of  
approved equipment. The required information shall be encoded in the following format:  
US:AAAEQ##Txxxx  
Where:  
US is a fixed field that indicates the equipment meets all requirements of 47 CFR Part  
68 (including the requirements published by ACTA).  
AAA is the responsible party’s Grantee Code obtained previously from the FCC’s  
Common Carrier Bureau or currently from ACTA.  
EQ is an Equipment Code indicating to the Service Provider any special signal handling  
or billing requirements. The Equipment codes are listed in Annex A (normative).  
## is the Ringer Equivalence Number without a decimal point (e.g. REN of 1.0 = 10,  
REN of 0.3 = 03). In the case of a “Z” ringer, ZZ shall appear. In the case of approved  
equipment without a network interface and equipment not connecting to circuits with  
analog ringing supplied then “NA” shall appear.  
T is the ringer type letter associated with the Ringer Equivalence Number, in  
accordance with the technical requirements. In the case of approved equipment without  
a network interface and equipment not connecting to circuits with analog ringing  
supplied, the letter “N” shall appear.  
xxxx is a product identifier, unique when combined with the responsible party’s Grantee  
Code, of at least one and up to nine alphanumeric characters (including one or more  
dashes (-) if desired. A dash shall not appear as the first or last character nor shall the  
identifier consist entirely of dashes). The responsible party shall define this identifier.  
Label Physical Characteristics  
The information required above shall be permanently affixed and legible without magnification. It may  
be etched, engraved, stamped, indelibly printed or otherwise permanently marked. Alternatively, the  
required information may be permanently marked on a nameplate of metal, plastic or other material  
fastened to the enclosure by welding, riveting or with a permanent adhesive. Such a nameplate shall be  
able to last for the expected lifetime of the equipment and shall not be readily detachable.  
Labeling Continuity and Changes  
The labeling content and format requirements in effect when a product was approved shall be effective  
for the life of the product. The labeling content and format requirements in effect at approval shall also  
continue to be effective for modified products. However, the responsible party shall have the option of  
conforming a product's labeling to current content and format requirements at any time.  
Other Label Requirements  
The label shall be placed in one of the following locations in a location where it can be found after  
installation:  
on an outside surface  
inside a readily available access door or panel  
on another readily accessible surface  
For example, the label should not be placed on the rear of a permanently wall-mounted device in a  
manner such that it is not readily accessible.  
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Appendix A – Regulatory Compliance  
Regulatory Requirements for Canada  
The following requirements are established under section 69.3 of the Telecommunications Act for purposes of  
section 5 of the Telecommunications Apparatus Regulations.  
Registered equipment shall bear the following identifying marks, and the Declaring Party shall ensure that these  
marks are permanently affixed to the equipment:  
(a) The registration number — Specifications of this mark are given in the document: Self-Marking of the  
Certification/Registration Number on Terminal Equipment — Application Procedure and Agreement;  
and  
(b) The model identification number under which the product was registered.  
A statement of compliance with Industry Canada requirements, such as the one given below, shall accompany  
each unit of equipment whether registered under this procedure or previously certified:  
"This product meets the applicable Industry Canada technical specifications"  
For terminal equipment intended for connection to loop-start or ground-start interfaces, the Ringer Equivalence  
Number (REN) must be calculated as per Section 1.8 of CS-03, Part I. A REN higher than that determined may  
be assigned by manufacturers to allow for production variations. The REN must be marked on the terminal  
equipment itself or added to the note below. A note similar to the following shall accompany each unit of  
equipment whether registered under this procedure or previously certified:  
"The Ringer Equivalence Number is an indication of the maximum number of devices allowed to be  
connected to a telephone interface. The termination on an interface may consist of any combination  
of devices subject only to the requirement that the sum of the RENs of all the devices does not  
exceed five".  
Pursuant to section 69.3 of the Telecommunications Act, Certified or self-declared TE will bear a valid identifying  
certification or registration number. The marking of the certification or registration number on the product shall be  
as follows:  
(a) TAC holder/DP will be responsible for permanently affixing the certification/registration number on the  
TE. The certification/registration number (see example below) identifies Certified or self-declared TE to  
the public, representatives of the telecommunications common carriers, the Department, and other  
interested parties. The letter height must be no less than 1.5 mm and the letters must be legible without  
magnification.  
(b) For integrated devices, e.g. a modem or one that is intended to become a sub-assembly of host  
equipment e.g. a data terminal, computer etc. that are designed to interface directly with the network,  
the certification/registration number shall be affixed to the integrated device itself.  
(c) The certification/registration number for a packaged TE will denote that the total package has been  
registered. However, the marking will normally be placed on that unit of the package, which connects to  
the network. For example, in a PBX, the marking will be placed on the common equipment, which  
connects to the network, rather than on plug-in components which may be added later. The Terminal  
Equipment List will show the common equipment but not the standard station apparatus or any  
proprietary station apparatus.  
(d) The marking format of the certification/registration number is as follows:  
IC: XXXXXX-YYYYYYYY  
Where:  
The letters "IC" have no other meaning or purpose than to identify the Industry Canada  
certification/registration number, and  
“XXXXXX-YYYYYYYY” is the certification/registration number; “XXXXXX” is the Company  
Number¹ (CN); it consists of up to six alphanumeric characters (A-Z, 0-9) assigned by  
Industry Canada; and “YYYYYYYY” is the Unique Product Number (UPN); it consists of  
up to eight alphanumeric characters (A-Z, 0-9) assigned by the applicant. Other  
characters, (such as & # *-) may not be used. Alphabetic characters must be capitalized.  
Note: The Company Number of registered equipment ends with an alphabetic character.  
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Appendix A – Regulatory Compliance  
(e) Certification Numbers granted prior to the implementation of the above marking format are  
grandfathered.  
(i) For previously certified TE, the self-marking format shall consist of the old certification number preceded  
by “IC:” For example, if the certification number is “123 1234 A”, then the self-mark would read “IC: 123  
1234 A”.  
(ii) For a new model that is registered to a family of previously certified TE, the self-marking format shall be:  
IC: XXXXXX-ZZZZZZZZ  
Where:  
“XXXXXX” is the Company Number, as in (d) above ; and  
“ZZZZZZZZ” is either the old certification number minus the old company number, or a  
new Unique Product Number assigned by the applicant. For example, if a new model is  
registered to the family of products with certification number “123 1234 A”, and that the  
Company Number for the registration is “123A”, then the self-mark for this new model  
would read “IC: 123A-1234 A”. If the applicant decides to replace “1234 A” with a new  
UPN, say “5678", then the self-mark would read “IC: 123A-5678".  
Industry Canada  
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment  
Regulations.  
Cet appareil numérique de la classe B respecte toutes les exigences du Reglement Canadien sur le matériel  
brouilleur.  
Multiple Listing  
This terminal device may be multiple listed to other distributors based upon the approval granted to the  
original certificate holder. In order to obtain a multiple listing certification, the following documentation must  
be presented to Industry Canada:  
(a) The model number, Industry Canada certificate number and certification number of the approved  
equipment;  
(b) A letter from the original certificate holder authorizing the Department to use information on file to  
grant a multiple listing certification. The name/model number, certificate number and certification  
number for the subject equipment must be shown. The letter must also declare that the model to be  
multiple listed is identical in design and construction to the originally approved model;  
(c) A letter, from the proposed multiple listee, requesting the certification;  
(d) A Terminal Equipment Certification / Testing Application and Agreement form, completed by the  
proposed multiple listee;  
(e) A drawing, sample or illustration of the product label; and  
(f) Payment in accordance with TRC-49 section on Multiple Listings.  
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Appendix B – Technical Specifications  
Appendix B – Technical  
Specifications  
Your MT2834ZDX fax modem meets the following specifications:  
Model Numbers MT2834ZDX, MT2834ZDXb  
Data Rates (Modem) 33.6K and 31.2K (ZDXb only), 28.8, 26.4K, 24K, 19.2K, 16.8K, 14.4K, 12K, 9600, 7200, 4800,  
2400, 1200 and 0-300 bps  
Data Rates (Fax) 14,400, 9600, 4800 and 2400 bps  
Data Format (Modem) Serial, Binary, Asynchronous  
Compatibility (Modem) ITU-T V.34, AT&T V.32terbo, ITU-T V.32bis, V.32, Bell 212A and 103/113, ITU-T V.22,  
V.22bis, V.42, V.42bis  
Compatibility (Fax) ITU-T Group 3, T.4, T.30, V.21, V.27ter, V.29, V.17, and EIA TR29.2  
Error Correction ITU-T V.42 (LAP-M or MNP 2, 3 or 4)  
Data Compression ITU-T V.42bis (4:1 throughput) or MNP 5 (2:1 throughput)  
Speed Conversion Serial port data rates adjustable to 300, 1200, 2400, 4800, 9600, 19.2K, 38.4K, 57.6K and  
115.2K bps  
Mode of Operation Half or full duplex over dial-up lines; automatic or manual dialing, automatic or manual answer  
Flow Control XON/XOFF, hardware (RTS/CTS), HP (ENQ/ACK)  
Intelligent Features Fully AT command compatible, autodial, redial, repeat dial, pulse or tone dial, dial pauses, call  
status display, auto parity and data rate selections, keyboard-controlled modem options, on-screen displays for  
modem option parameters, command lines of up to 60 digits each, and help menus  
Command Buffer 60 characters  
Modem Modulations FSK at 300 bps, PSK at 1200 bps, QAM at 2400, 4800, and 9600 bps (non-trellis), QAM with  
trellis coded modulation (TCM) at 9600, 12K, 14.4K, 16.8K, 19.2K, 21.6K, 24K, 26.4K, 28.8K, 31.2K and 33.6K bps  
Fax Modulations V.21 CH2 FSK at 300 bps, V.27ter DPSK at 2400 and 4800 bps, V.29 QAM at 7200 and 9600 bps,  
V.17TCM at 7200, 9600, 12K, and 14.4K bps  
Fax Carrier Frequencies V.21 Ch2 (half duplex): 1650 Hz mark, 1850 Hz space for transmit originate 1650 Hz  
mark, 1850 Hz space for transmit answer V.27ter: 1800 Hz originate/answer V.29 QAM: 1700 Hz originate/answer  
V.17 TCM 1800 Hz originate/answer  
Transmit Level -13 dBm  
Frequency Stability +/-0.01%  
Receiver Sensitivity -43dBm under worst case conditions  
AGC Dynamic Range 43 dB  
Interface Connectors EIA RS-232C/ITU-T V.24/V.28 DB25 RS-232C connector; two RJ-11 phone jacks, power jack  
Cables One 14-foot RJ-11 phone cable (USA); external power transformer and cord  
Note: Any cables connected to the computer should be shielded to reduce interference.  
Diagnostics Power-on self test, local analog loop, local digital loop, remote digital loop  
Indicators LEDs for Transmit Data, Receive Data, Carrier Detect, 28.8K bps, 14.4K bps, 9600 bps, Off Hook,  
Terminal Ready, Error Correction, Fax  
Speaker Command-controlled speaker for call progress monitoring  
Manual Control Power switch  
Environmental Temperature range 0o-50oC (32o - 120oF); humidity range 20-90% (non-condensing)  
Power Requirements 100-130V AC, 50/60 Hz, 0.1A/5W  
Dimensions 10.8 cm wide x 14.8 cm long x 2.9 cm high (4.25” x 5.8” x 1.15”)  
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Appendix C – Warranty and Service  
Appendix C – Warranty and Service  
Multi-Tech Warranty Statement  
Multi-Tech Systems, Inc., (hereafter “MTS”) warrants that its products will be free from defects in material or  
workmanship for a period of two, five, or ten years (depending on model) from date of purchase, or if proof of  
purchase is not provided, two, five, or ten years (depending on model) from date of shipment.  
MTS MAKES NO OTHER WARRANTY, EXPRESS OR IMPLIED, AND ALL IMPLIED WARRANTIES OF  
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED.  
This warranty does not apply to any products which have been damaged by lightning storms, water, or power surges  
or which have been neglected, altered, abused, used for a purpose other than the one for which they were  
manufactured, repaired by Customer or any party without MTS’s written authorization, or used in any manner  
inconsistent with MTS’s instructions.  
MTS’s entire obligation under this warranty shall be limited (at MTS’s option) to repair or replacement of any products  
which prove to be defective within the warranty period or, at MTS’s option, issuance of a refund of the purchase price.  
Defective products must be returned by Customer to MTS’s factory — transportation prepaid.  
MTS WILL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES, AND UNDER NO CIRCUMSTANCES WILL ITS  
LIABILITY EXCEED THE PRICE FOR DEFECTIVE PRODUCTS.  
Repair Procedures for U.S. and Canadian Customers  
In the event that service is required, products may be shipped, freight prepaid, to our Mounds View, Minnesota  
factory:  
Multi-Tech Systems, Inc.  
2205 Woodale Drive  
Mounds View, MN 55112  
Attn: Repairs, Serial # ____________  
A Returned Materials Authorization (RMA) is not required. Return shipping charges (surface) will be paid by MTS to  
destinations in U.S. and Canada.  
Please include, inside the shipping box, a description of the problem, a return shipping address (must have street  
address, not P.O. Box), your telephone number, and if the product is out of warranty, a check or purchase order for  
repair charges.  
For out of warranty repair charges, go to www.multitech.com/DOCUMENTS/Company/warranty/  
Extended two-year overnight replacement service agreements are available for selected products. Please call MTS  
customer service at (888) 288-5470 or visit our web site at www.multitech.com/PARTNERS/Programs/orc/ for details  
on rates and coverage’s.  
Please direct your questions regarding technical matters, product configuration, verification that the product is  
defective, etc., to our Technical Support department at (800) 972-2439 or email [email protected]. Please  
direct your questions regarding repair expediting, receiving, shipping, billing, etc., to our Repair Accounting  
department at (800) 328-9717 or (763) 717-5631, or email [email protected].  
Repairs for damages caused by lightning storms, water, power surges, incorrect installation, physical abuse, or user-  
caused damages are billed on a time-plus-materials basis.  
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Appendix C – Warranty and Service  
Repair Procedures for International Customers (Outside U.S.A. and Canada)  
Your original point of purchase Reseller may offer the quickest and most economical repair option for your Multi-Tech  
product. You may also contact any Multi-Tech sales office for information about the nearest distributor or other repair  
service for your Multi-Tech product. The Multi-Tech sales office directory is available at  
In the event that factory service is required, products may be shipped, freight prepaid to our Mounds View, Minnesota  
factory. Recommended international shipment methods are via Federal Express, UPS or DHL courier services, or by  
airmail parcel post; shipments made by any other method will be refused. A Returned Materials Authorization (RMA)  
is required for products shipped from outside the U.S.A. and Canada. Please contact us for return authorization and  
shipping instructions on any International shipments to the U.S.A. Please include, inside the shipping box, a  
description of the problem, a return shipping address (must have street address, not P.O. Box), your telephone  
number, and if the product is out of warranty, a check drawn on a U.S. bank or your company’s purchase order for  
repair charges. Repaired units shall be shipped freight collect, unless other arrangements are made in advance.  
Please direct your questions regarding technical matters, product configuration, verification that the product is  
defective, etc., to our Technical Support department nearest you or email [email protected]. When calling the  
U.S., please direct your questions regarding repair expediting, receiving, shipping, billing, etc., to our Repair  
Accounting department at +(763) 717-5631 in the U.S.A., or email [email protected].  
Repairs for damages caused by lightning storms, water, power surges, incorrect installation, physical abuse, or user-  
caused damages are billed on a time-plus-materials basis.  
Repair Procedures for International Distributors  
International distributors should contact their MTS International sales representative for information about the repairs  
for their Multi-Tech product.  
Please direct your questions regarding technical matters, product configuration, verification that the product is  
defective, etc., to our International Technical Support department at +(763)717-5863. When calling the U.S., please  
direct your questions regarding repair expediting, receiving, shipping, billing, etc., to our Repair Accounting  
department at +(763) 717-5631 in the U.S.A. or email [email protected].  
Repairs for damages caused by lightning storms, water, power surges, incorrect installation, physical abuse, or user-  
caused damages are billed on a time-plus-materials basis.  
Replacement Parts  
SupplyNet, Inc., can supply you with replacement power supplies, cables and connectors for selected Multi-Tech  
products. You can place an order with SupplyNet via mail, phone, fax or the Internet at the following addresses:  
Mail:  
SupplyNet, Inc.  
614 Corporate Way  
Valley Cottage, NY 10989  
800 826-0279  
Phone:  
Fax:  
914 267-2420  
Email:  
Online Warranty Registration  
If you have access to the World Wide Web, you can register your Multi- Tech product online at the following URL:  
About the Internet  
Multi-Tech maintains a World Wide Web site at:  
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Appendix D – WEEE Statement  
Appendix D - Waste Electrical and  
Electronic Equipment (WEEE) Statement  
July, 2005  
The WEEE directive places an obligation on EU-based manufacturers, distributors, retailers and importers  
to take-back electronics products at the end of their useful life. A sister Directive, ROHS (Restriction of  
Hazardous Substances) complements the WEEE Directive by banning the presence of specific  
hazardous substances in the products at the design phase. The WEEE Directive covers all Multi-Tech  
products imported into the EU as of August 13, 2005. EU-based manufacturers, distributors, retailers and  
importers are obliged to finance the costs of recovery from municipal collection points, reuse, and  
recycling of specified percentages per the WEEE requirements.  
Instructions for Disposal of WEEE by Users in the European Union  
The symbol shown below is on the product or on its packaging, which indicates that this product must not  
be disposed of with other waste. Instead, it is the user’s responsibility to dispose of their waste equipment  
by handing it over to a designated collection point for the recycling of waste electrical and electronic  
equipment. The separate collection and recycling of your waste equipment at the time of disposal will help  
to conserve natural resources and ensure that it is recycled in a manner that protects human health and  
the environment. For more information about where you can drop off your waste equipment for recycling,  
please contact your local city office, your household waste disposal service or where you purchased the  
product.  
Multi-Tech Systems, Inc. MT2834ZDX User's Guide  
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Index  
Index  
Number Linking NdNe ................................................ 13  
Number of XOFF Characters Sent #X......................... 16  
On Hook/Off Hook H.................................................. 11  
Pacing (Computer-Initiated Flow Control) &E 12-13 . 10  
Pulse Dial P ................................................................. 13  
Quiet Answer @ .......................................................... 16  
Rate Negotiation &RN ................................................ 14  
Read Line Probe Data %DP........................................ 10  
Read Register Value Sr?.............................................. 14  
Remote Configuration Escape Sequence  
%%%AT<CR> ..................................................... 17  
Respond to Remote Digital Loopback Signal &T ....... 15  
Result Codes and Call Progress Selection X................ 16  
Result Codes Enable/Disable Q................................... 13  
Result Codes V ............................................................ 15  
Retransmit Count $R ................................................... 14  
Return to Command Mode ; ........................................ 16  
Reverse Originate/Answer Modes R ........................... 13  
Serial Port Baud Rate $SB........................................... 15  
Set Pulse Dial Ratios &P............................................. 13  
Set Register Value Sr= ................................................ 14  
Square Wave Ring Detect &RD.................................. 14  
Store Configuration &W ............................................. 16  
Store Telephone Number DsNd..................................... 9  
Tone-Dial T ................................................................. 15  
Trellis-Coded Modulation #T...................................... 15  
V.32terbo Handshake Tones #V .................................. 15  
V.42 Error Correction at 300 bps $E ........................... 11  
V.42 Error Correction Modes &E 0-2 ......................... 10  
V.42 Mode Selection in Originate Mode #L................ 12  
Wait for New Dial Tone W.......................................... 15  
XON/XOFF Pass-Through &E 6-7 ............................. 10  
A
AT commands.....................................................................8  
AT Commands  
Answerback &A.............................................................8  
Asymmetrical Bit Rate &RA .......................................14  
Asynchronous Word Length $EB ................................11  
AT Command Control %DC .........................................9  
Auto Speed Detection in Answer Mode #A ...................8  
Auto-Reliable Buffering $A...........................................8  
Baud Adjust $BA ...........................................................9  
Call Card Tone Detect $...............................................16  
Carrier Detect Control &C.............................................9  
Clear to Send Control &R............................................14  
Cleardown at Disconnect &CD......................................9  
Continuous Redial :......................................................16  
Continuous Redial A :....................................................8  
CTS/RTS Interaction Control &RF .............................14  
Data Compression &E 14-15 .......................................10  
Data Set Ready Control &S .........................................14  
Data Terminal Ready Control &D .................................9  
Dial a Stored Number N...............................................13  
Dial Ds ...........................................................................9  
Dialing Pause ,..............................................................16  
Display Parity Bit $J....................................................12  
DSR/CD Interaction Control &SF ...............................15  
DTMF Detection >DT..................................................10  
DTR Dialing $D.............................................................9  
Echo Command Mode Characters E ............................10  
Echo Frequency Canceller Offset Compensation %F..11  
Enable/Disable Auto-Reliable Fallback Character $F..11  
Escape Code +++AT<CR>..........................................17  
Escape Sequence <BREAK>AT<CR>.......................17  
Escape Sequence Options %E .....................................11  
Fallback Modes When Online #F.................................11  
Flash On-Hook !...........................................................16  
Force Answer Mode A ...................................................8  
Force Repeat Last Command A/ ....................................8  
Format Line Probe Data %DF.......................................9  
Go Back Online O........................................................13  
Guard Tones &G..........................................................11  
Help Screens $H...........................................................12  
Hewlett Packard ENQ/ACK Pacing &E 8-9................10  
Immediate Line Probe &RP.........................................14  
Immediate Retrain &RR..............................................14  
Inquire Product Codes I ...............................................12  
List Commands L.........................................................12  
Load Default Configurations &F .................................11  
Long Space Disconnect Y ............................................16  
Loopback Test Modes U ..............................................15  
Maximum Reliable Block Size &BS..............................8  
Modem Baud Rate $MB ..............................................13  
Modem Reset Z............................................................16  
Modem Speaker Control M..........................................12  
Modem-Initiated Flow Control &E 3-5........................10  
Multi-Tech or Standard Result Code &Q.....................13  
Non-Error Correction Mode Flow Control &E 10-11..10  
C
connecting the modem ....................................................... 5  
D
Data is being lost.............................................................. 22  
driver installation.............................................................. 6  
F
Fax and data programs can’t run at the same time ........... 23  
FCC Regulations .............................................................. 24  
Features.............................................................................. 4  
File transfer is slower than it should be............................ 22  
G
Getting Started ................................................................... 4  
I
Install Data Communications Software.............................. 6  
installing the modem driver ............................................ 6  
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Index  
Replacement Parts............................................................ 31  
Result codes ..................................................................... 19  
RETURN (ENTER) key..................................................... 8  
RS232 Connection ............................................................. 5  
L
Label content and format ..................................................26  
LED indicators....................................................................7  
LINE Connection................................................................5  
S
M
safety.................................................................................. 4  
Specifications................................................................... 29  
S-Registers ....................................................................... 18  
modem driver installation................................................6  
N
T
None of the LEDs light when the modem is on................20  
Technical Support .............................................................. 2  
Telecommunications Regulations for Canada.................. 27  
The modem cannot connect when answering................... 22  
The modem dials but cannot connect ............................... 21  
The modem disconnects while online .............................. 22  
The modem does not respond to commands..................... 20  
There are garbage characters on the monitor.................... 23  
Troubleshooting ............................................................... 20  
O
Ordering Replacement Parts .............................................31  
P
Part 68 of the FCC rules ...................................................25  
PHONE Connection............................................................5  
POWER Connection...........................................................5  
Power-On Test....................................................................5  
W
We Supply.......................................................................... 4  
R
Register your modem........................................................31  
remove old modem driver...................................................6  
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