USER
MANUAL
MODEL 1010A
Miniature, High Speed
Short Range Modem
with Transformer Isolation
Part# 07M1010A-A
Doc# 039011UA
Revised 11/8/95
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
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2.0 GENERAL INFORMATION
APPENDIX C
RS-232C PIN CONFIGURATIONS
Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is
warranted for One Year parts and labor. If any questions or problems
arise during installation or use of this product, please do not hesitate to
contact Patton Electronics Technical Support at (301) 975-1007.
RS-232C INTERFACE (DCE)
1- (FG) Frame Ground
2- (TD) Transmit Data
3- (RD) Receive Data
4- (RTS) Request to Send
5- (CTS) Clear to Send
6- (DSR) Data Set Ready
7- (SG) Signal Ground
8- (DCD) Data Carrier Detect
2.1 FEATURES
• Transformer coupled for DC isolation between modems
• Immune to ground loops caused by ground potential differences
• Supports asynchronous RS-232 communication over 2 twisted pair
• Supports data rates to 115.2 Kbps, distances to 8.5 miles
• Loops back all handshaking signals on the RS-232 interface
• Externally accessible DCE/DTE switch makes configuration easy
• Very thin case (.75") for closely spaced computer ports
Data Term Ready (DTR) - 20
• No AC power or batteries required—draws all necessary operating
power from the RS-232 interface
• Provides surge protection of 600 Watts per wire
2.2 DESCRIPTION
The Patton Model 1010A miniature, high speed, transformer
isolated short range modem lets two asynchronous RS-232 devices
communicate between buildings, over two twisted pair. Supporting
asynchronous data rates to 115.2 Kbps, the Model 1010A derives the
necessary power for operation from the data and control voltages on
the RS-232 interface. DC transformer isolation on the line side gives
the Model 1010A immunity to ground loops that would otherwise
hamper between-building communications.
An external DCE/DTE switch lets you connect to the serial port of
either a computer/terminal (DTE) or a modem (DCE) without using a
crossover cable. The Model 1010A is available with three 4 wire
interface options: RJ-11, RJ-45 or terminal blocks with strain relief.
The Model 1010A also incorporates high speed avalanche diodes
that intercept data line transient surges and shunt them safely to
chassis ground. With surge handling capacity of 600W per wire at
1mS, the 1010A can protect itself and connected equipment from
nearby lightning strikes and other surges of electromagnetic radiation.
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APPENDIX B
3.0 CONFIGURATION
SPECIFICATIONS
The Model 1010A is designed to be easy to use. There are no
internal jumpers or DIP switches to set, so there is no need to open the
case to configure the unit (you may need to open the case for wire
connection—refer to section 4.0). The only configuration necessary for
operation is proper setting of the external DCE/DTE switch.
Transmission Format: Asynchronous, full duplex
Transmission Line: Two unconditioned twisted pair 19 - 26 AWG
Range: (See table below)
The figure below shows the location of the DCE/DTE switch on the
PC board, as well as the location of the terminal block and surge
suppressors.
Interfaces: EIA RS-232, CCITT V.24
Data Rates: 50 - 115.2 Kbps
Isolation: Minimum 1500 V RMS via custom transformers
Surge Protection: 600W power dissipation at 1 mS;
component response time of 1 pS; installed response time of 2 µs
DCE/DTE
Switch
Surge
Suppressors
Dimensions: 2.66" x 2.10" x 0.73"
Factory Switch Setting: DCE (transmits from RS-232 on pin 3)
DCE
DTE
Control Signals: DSR and DCD follow DTR from the terminal
(DTE); CTS follows RTS from the terminal (DTE)
Transformers
Connectors: DB-25 male or female on RS-232 side;
RJ-11, RJ-45 or terminal block with strain relief on
line side
Terminal
Block
Power Supply: None required; uses power from EIA data and
control signals
3.1 SETTING THE DTE/DCE SWITCH
Temperature Range: 0-60°C (32-140°F)
Altitude: 0-15,000 feet
For your convenience, the Model 1010A has an externally
accessible DCE/DTE switch (see figure below). If the device connected
to the Model 1010A is a modem or multiplexer (or is wired like one), set
the switch to "DTE". This setting causes the Model 1010A to behave
like Data Terminal Equipment and transmit data on pin 2.
Humidity: Up to 95% non-condensing
Weight: 2 oz.
Model 1010A Distance Table (miles)
If the device connected to the Model 1010A is a PC, terminal or
host computer (or is wired like one), set the switch to "DCE". This
setting causes the Model 1010A to behave like Data Communications
Equipment and transmit data on pin 3.
Wire Gauge
Data
Rate
19
24
0.45
1.5
1.8
2.0
2.5
3.5
4.7
5.7
26
115,200
57,600
38,400
19,200
9,600
4,800
2,400
1,200
0.6
2.0
2.4
2.6
4.0
5.0
6.8
8.5
0.3
1.0
1.2
1.2
1.6
2.2
3.2
3.8
DCE
DTE
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4.0 INSTALLATION
10. BEND the top half of the case as necessary to place it over the
strain relief assembly. Do not snap the case together yet.
Once you have properly configured the DTE/DCE switch, you are
ready to connect the Model 1010A to your system. This section tells
you how to properly connect the Model 1010A to the twisted pair and
RS-232 interfaces, and how to operate the Model 1010A.
4.1 CONNECTION TO THE TWISTED PAIR INTERFACE
The Model 1010A supports data-only communication between two
RS-232 devices at distances to 8.5 miles and data rates to 115.2 Kbps.
There are two essential requirements for installing the Model 1010A:
1) These units work in pairs. Therefore, you must have one Model
1010A at each end of a two twisted pair interface.
11. Insert one captive screw through a saddle washer, then insert
the captive screw with the washer on it through the hole in the DB-25
end of the case. Snap that side of the case closed. Repeat the
process for the other side. This completes cable installation.
2) To function properly, the Model 1010A needs two twisted pairs of
metallic wire. These pairs must be unconditioned, dry metallic wire,
between 19 and 26 AWG (the higher number gauges may limit distance
somewhat). Standard dial-up telephone circuits, or leased circuits that
run through signal equalization equipment, are not acceptable.
4.2 CONNECTION TO THE RS-232 INTERFACE
For your convenience, the Model 1010A is available with three
different twisted pair interfaces: RJ-11 jack, RJ-45 jack and terminal
blocks with strain relief.
Once you have configured the Model 1010A for DTE or DCE and
connected the twisted pair wires correctly, all that remains is to plug the
1010A directly into the DB-25 port of the RS-232 device. After doing
so, remember to insert and tighten the two captive connector screws.
(Note: If you must use a cable to connect the Model 1010A to the
RS-232 device, make sure it is a straight through cable of the shortest
possible length—we recommend 6 feet or less).
4.1.1 TWISTED PAIR CONNECTION USING RJ-11 OR RJ-45
The RJ-11 and RJ-45 connectors on the Model 1010A's twisted pair
interface are pre-wired for a standard TELCO wiring environment. The
signal/pin relationships are shown below:
4.3 OPERATING THE MODEL 1010A
Once the Model 1010A is properly installed, it should operate
transparently—as if it were a standard cable connection. Operating
power is derived from the RS-232 data and control signals; there is no
"ON/OFF" switch. All data signals from the RS-232 interface are
passed straight through. All control signals from the RS-232 interface
are looped back.
RJ-11
SIGNAL
RJ-45
SIGNAL
1...................GND*
2...................RCV-
3...................XMT+
4...................XMT-
5...................RCV+
6...................GND
1 .................N/C
2 .................GND*
3 .................RCV-
4 .................XMT+
5 .................XMT-
6 .................RCV+
7 .................GND
8 .................N/C
(Note: If your system requires hardware flow control, you will need the
Patton Model 1012 or Model 1060 Short Range Modem. Call Patton
Customer Service at 301-975-1007 for more information).
4
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8. Place the 2 halves of the strain relief assembly on either side of
the telephone wire and press together very lightly. Slide the assembly
so that it is about 2 inches from the terminal posts and press together
firmly. If your cable diameter is too small or too large for our strain
relief, please contact our technical support. We have strain relief
assemblies to accommodate most cable diameters.
When connecting two Model 1010As, it is necessary to use a
"cross over" cable. The diagram below shows how a cross over cable
should be constructed for an environment where both Model 1010As
use a 6-wire RJ-11 connector. Similar logic should be followed when
using RJ-45 connectors or a combination of the two.
RJ-11 Cable (4-Wire)
SIGNAL
PIN#
PIN#
SIGNAL
GND†
RCV-
XMT+
XMT-
RCV+
GND†
1-----------------------6
2-----------------------4
3-----------------------5
4-----------------------2
5-----------------------3
6-----------------------1
GND†
XMT-
RCV+
RCV-
XMT+
GND†
†Connection to ground is optional
1
2
3
4
5
6
7
8
9. Insert the strain relief assembly with the wire going through it
into the slot in the bottom half of the modem case and set it into the
recess in the case.
1
2
3
4
5
6
4.1.2 TWISTED PAIR CONNECTION USING TERMINAL BLOCKS
If your RS-422 application requires you to connect two pairs of
bare wires to the Model 1010A, you will need to open the case to
access the terminal blocks. The following instructions will tell you how
to open the case, connect the bare wires to the terminal blocks, and
fasten the strain relief collar in place so that the wires won't pull loose.
(continued)
8
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1. Open the unit by gently inserting a screw driver between the DB-25
connector and the lip of the plastic case (see below). You don't have to
worry about breaking the plastic, but be careful not to bend the D-sub
connector.
4. Connect one pair of wires to XMT+ and XMT- (transmit positive
and negative) on the terminal block, making careful note of which color
is positive, and which color is negative.
5. Connect the other pair of wires to RCV+ and RCV- (receive
positive and negative) on the terminal block, again making careful note
of which color is positive, and which color is negative.
Ultimately, you will want to construct a two pair cross over cable that
makes a connection with the RS-422 device as shown below:
XMT +
XMT -
G
RCV -
RCV +
RCV+
RCV -
G
XMT -
XMT +
One Pair
One Pair
}
}
To Shield (Optional)
6. If there is a shield around the telephone cable, it may be
connected to "G" on the terminal block. To avoid ground loops, we
recommend connecting the shield at the computer end only. A ground
wire is not necessary for proper operation of the Model 1010A.
7. When you finish connecting the wires to the terminal block, the
assembly should resemble the diagram below:
Once the unit has been opened, you will be able to see the
terminal blocks located at the rear of the PC board.
2. Strip the outer insulation from the twisted pairs about one inch
from the end.
3. Strip back the insulation on each of the 2 twisted pair wires
about .25".
6
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