Quatech Network Card DSC 200 User Guide

DSC-200/ 300  
Two Channel RS-422/ 485 Asynchronous  
Communications Adapter  
for PCI bus  
User's Manual  
QUATECH, INC.  
662 Wolf Ledges Parkway  
Akron, Ohio 44311  
TEL: (330) 434-3154  
FAX: (330) 434-1409  
http:/ / www.quatech.com  
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(c) 1998 - 2000, Quatech, Inc.  
NOTICE  
The information contained in this document cannot be reproduced in any form  
without the written consent of Quatech, Inc. Likewise, any software programs that might  
accompany this document can be used only in accordance with any license agreement(s)  
between the purchaser and Quatech, Inc. Quatech, Inc. reserves the right to change this  
documentation or the product to which it refers at any time and without notice.  
The authors have taken due care in the preparation of this document and every  
attempt has been made to ensure its accuracy and completeness. In no event will Quatech,  
Inc. be liable for damages of any kind, incidental or consequential, in regard to or arising out of  
the performance or form of the materials presented in this document or any software  
programs that might accompany this document.  
Quatech, Inc. encourages feedback about this document. Please send any written  
comments to the Technical Support department at the address listed on the cover page of this  
document.  
DOS, Windows ME, Windows 2000, Windows 98, Windows 95, Windows NT are trademarks  
or registered trademarks of Microsoft Corporation. OS/ 2 is a registered trademark of IBM  
Corporation. All other trademarks or registered trademarks are property of their respective  
owners.  
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Declaration of Conformity  
Manu factu rer's N am e:  
Quatech Inc.  
Manufacturer's Ad d ress:  
662 Wolf Ledges Parkway  
Akron, Ohio 44311 (USA)  
Application of Council Directive:  
89/ 336/ EEC  
Standards to which  
Conform ity is Declared :  
* EN50081-1 (EN55022,  
EN60555-2, EN60555-3)  
* EN50082-1 (IEC 801-2,  
IEC 801-3, & IEC 801-4)  
Typ e of Equipment:  
Equipment Class:  
Prod u ct N am e:  
Information Technology  
Equipment  
Commercial, Residential, & Light  
Industrial  
PCI Dual Serial Communications  
Card  
Mod el N u m ber :  
DSC-200/ 300 (750,IND)  
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1 General Information  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7  
1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8  
1.1.1 "IND" Option --- Surge Suppression Upgrade . . . . . . . . . . . 8  
2 Hardware Configuration  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
2.1 RS-422 or RS-485 Signal Line Termination . . . . . . . . . . . . . . . . . . 9  
2.2 Signal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
2.3 Full-duplex/ Half-duplex Operation . . . . . . . . . . . . . . . . . . . . . . . . 10  
2.4 Clock Rate and Optional Registers . . . . . . . . . . . . . . . . . . . . . . . . . . 11  
2.4.1 Enable Scratchpad Register (SPAD, J13) . . . . . . . . . . . . . . . . . 11  
2.4.2 Force High-Speed UART Clock (X2, X4, or X8,  
J10-J12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12  
3 Hard w are Installation  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13  
4 Address Map and Special Registers  
. . . . . . . . . . . . . . . . . 14  
4.1 Base Address and Interrupt Level (IRQ) . . . . . . . . . . . . . . . . . . . 14  
4.2 Enabling the Special Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
4.3 Interrupt Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
4.4 Options Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
4.4.1 Enhanced Serial Adapter Identification . . . . . . . . . . . . . . . . . 16  
4.4.2 Clock Rate Multiplier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
5 Wind ow s Configuration  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
5.1 Windows Millennium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
5.2 Windows 2000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19  
5.3 Window s 98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20  
5.4 Window s 95 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21  
5.5 Using the "New Hard w are Found " Wizard . . . . . . . . . . . . . . . . 23  
5.6 Wind ow s N T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24  
6 DOS and Other Operating Systems  
. . . . . . . . . . . . . . . . . . 25  
6.1.1 QTPCI.EXE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25  
7 OS/ 2  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28  
8 External Connections  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29  
8.1 RTS/ cts Handshake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  
8.2 RCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30  
8.3 XCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
8.4 AUXIN/ AUXOUT Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31  
8.5 Half-Duplex/ Full-Duplex Selection . . . . . . . . . . . . . . . . . . . . . . . . . 32  
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8.6 Termination Resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34  
8.7 RS-422/ 485 Peripheral Connection . . . . . . . . . . . . . . . . . . . . . . . . . . 35  
9 PCI Resource Map  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36  
10 Specifications  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37  
11 Troubleshooting  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38  
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1 General Information  
The Quatech, Inc. DSC-200/ 300 provides two RS-422 or RS-485 asynchronous  
serial communication interfaces for IBM-compatible personal computer systems using  
the PCI expansion bus. The DSC-200/ 300 uses Quatech's new Enhanced Serial Adapter  
design. Legacy serial port data rates are limited to a maximum of 115,200 bits per  
second. Quatech Enhanced Serial Adapters can achieve data rates as high as 921,600  
bits per second.  
As a PCI device, the DSC-200/ 300 requires no hardware configuration. The card  
is automatically configured by the computer's BIOS or operating system. The two  
serial ports share a single interrupt line and are addressed in a contiguous block of 16  
bytes. A special interrupt status register is provided to help software to manage the  
shared interrupt.  
The DSC-200/ 300's serial ports are using 16750 Universal Asynchronous  
Receiver/ Transmitters (UARTs). These UARTs contain hardware buffers (FIFOs) which  
reduce processing overhead and allow higher data rates to be achieved. The 16750  
contains a 64-byte FIFO and can transmit and receive data at a rate of up to 921,600 bits  
per second. The 16750 is recommended for heavy multitasking environments and for  
applications involving high data rates.  
The DSC-200/ 300 is supported under several popular operating systems and  
environments. Contact the sales department for details on current software offerings.  
Most device drivers are available for download from the Quatech world wide web site  
at http:/ / www.quatech.com.  
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1.1 Features  
The standard DSC-200/ 300 implements each of its communication channels with  
a 16750 UART and uses standard line driver and receiver components. For improved  
performance and industrial-grade reliability.  
1.1.1 "IN D" Option --- Surge Suppression Upgrade  
The "IND" upgrade provides the protection essential for reliable use in an  
industrial environment. Each communication line has a surge suppressor capable of  
sustaining up to 40A 20us peak transient surges, a clamping voltage of 30V and a peak  
energy dissipation of 0.1 Joules.  
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2 Hardware Configuration  
The DSC-200/ 300 is automatically configured at boot time by the computer's  
BIOS or operating system. There are no required switches or jumpers to set for  
installation.  
This chapter lists a number of jumper settings that control various hardware  
features. Jumpers J1-J4, located in a column near the D-9 connectors, control the RS-422  
or RS-485 signal line termination. Jumpers J5-J8, located in a column just to the right of  
J1-J4, control how signals are routed from the UARTs to the connector, as well as full- or  
half- duplex operation. Jumpers J10-J13, grouped together at the end of the board  
opposite the D-9 connectors, control special options.  
Any changes from the factory default should be made before installing the  
DSC-200/ 300 in the computer.  
2.1 RS-422 or RS-485 Signal Line Termination  
Jumpers J1-J4 allow the selection of 100-ohm RS-422 termination, 120-ohm RS-485  
termination, or no termination at all. The factory default, shown in Figure 1, is RS-422  
termination. For full details, see page 24.  
Jumpers J1-J4  
3
2
1
RS-422 termination  
(100 ohms)  
(factory default)  
Figure 1 --- Factory default signal termination settings  
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2.2 Signal Connections  
The DSC-200/ 300 provides each of two serial ports with four differential signal  
pairs: TxD, RxD, AUXOUT, and AUXIN. TxD and RxD are always present at the  
connector. The AUXOUT and AUXIN signals can be used to support RTS/ CTS  
handshaking, external clocking, or external signal loopback. The factory default  
configuration, as shown in Figure 2, is a loopback of AUXOUT to AUXIN at the  
connector, with RTS and CTS looped back on the board. There is an extensive  
discussion of this topic starting on page 19.  
2.3 Full-duplex/ Half-duplex Operation  
The DTR or RTS modem control output of the UART can be used to enable and  
disable the transmit drivers. The inverse of these signals can also be used to enable  
and disable the receivers. These options are selectable per channel. The factory  
default, as shown in Figure 2, is for both the drivers and receivers of both channels to  
be continuously enabled. Two spare jumpers are installed in neutral positions. For  
details, refer to page 22.  
The DSC-200/ 300 is shipped from the factory with each channel configured as  
shown in Figure 2.  
XC LK 6  
3
2
RC LK  
AUXIN  
C TS  
Jumpers J5, J7  
5
4
AUXOUT  
RTS  
1
Loopback RTS to CTS  
Loopback AUXOUT to AUXIN  
Loopback XCLK to RCLK  
3
Rx ENAB LE  
Tx ENAB L
Jumpers J6, J8  
2 RTS  
Tx ENAB LE5  
Tx ENAB LE4  
1
DTR  
Full Duplex Operation  
(spare jumpers supplied)  
Figure 2 --- Factory default signal interface settings  
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2.4 Clock Rate and Optional Registers  
Figure 3 shows the jumper configuration as shipped from the factory, with two  
spare jumpers applied in neutral positions. Remove one or both and apply as shown  
in following subsections to set optional features.  
J10  
J11  
J12  
X2  
X4  
X8  
SPAD  
J13  
Figure 3 --- Factory default clock rate and options settings  
2.4.1 Enable Scratchpad Register (SPAD, J13)  
In the default configuration, an Interrupt Status Register and an Options Register  
(see page 10) replace the scratchpad (base address + 7) of each UART. If the SPAD  
jumper is applied as in Figure 4, the UART scratchpad registers are enabled, and the  
Interrupt Status Register and the Options Register are not available.  
J10  
J11  
J12  
X2  
X4  
X8  
SPAD  
J13  
Figure 4 --- Enable scratchpad registers  
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2.4.2 Force High-Speed UART Clock (X2, X4, or X8, J10-J12)  
These jumpers force an increase of the UART input clock frequency by a factor of  
two, four, or eight. This feature can allow legacy software to use baud rates above  
115,200 bits per second. It is also useful if the serial port device driver does not directly  
support setting the higher baud rates through the Options Register (see page 10).  
If one of these jumpers is applied, it overrides any value written to the Options  
Register to set the clock multiplier by software. The effective baud rate will be either  
two, four, or eight times the value for which the UART itself is programmed.  
The factory default is none of these jumpers applied, which allows for software  
control of the clock multiplier via the Options Register. The Options Register powerup  
default is for a standard times-1 clock of 1.8432 MHz for compatibility with standard  
serial ports.  
J10  
J11  
J12  
J10  
J11  
J12  
X2  
X4  
X2  
X4  
X8  
X8  
SPAD  
SPAD  
J13  
J13  
Force times-two clock  
Baud rates up to 230.4 kbps  
Factory default  
software control  
J10  
J10  
J11  
J12  
X2  
X4  
X2  
X4  
J11  
J12  
X8  
X8  
SPAD  
SPAD  
J13  
J13  
Force times-eight clock  
Force times-four clock  
Baud rates up to 460.8 kbps  
Baud rates up to 921.6 kbps  
Figure 5 --- Clock multiplier jumper options  
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3 Hard w are Installation  
1. Turn off the power of the computer system in which the DSC-200/ 300 is to be  
installed.  
2. Remove the system cover according to the instructions provided by the  
computer manufacturer.  
3. Make any desired optional jumper setting changes.  
4. Install the DSC-200/ 300 in any empty PCI expansion slot. The board should be  
secured by installing the Option Retaining Bracket (ORB) screw.  
5. Replace the system cover according to the instructions provided by the  
computer manufacturer.  
6. Attach and secure the cable connectors to the desired equipment.  
7. Turn on the power of the computer system.  
The output of the DSC-200/ 300 is two female 9-pin D-connectors.  
Termination select  
Clock multiplier/  
scratchpad select  
Serial  
Port  
2
J5  
J6  
J1  
J2  
J3  
port 1  
port 2  
J 1 0  
J 1 1  
J 1 2  
J 1 3  
X2  
X4  
X8  
SP AD  
J7  
J8  
J4  
Serial  
Port  
1
Interface configuration  
Figure 6 --- Jumper/ connector locations  
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4 Address Map and Special Registers  
This chapter explains how the two UARTs and special registers are addressed,  
as well as the layout of those registers. This material will be of interest to programmers  
writing driver software for the DSC-200/ 300.  
4.1 Base Address and Interrupt Level (IRQ)  
The base address and IRQ used by the DSC-200/ 300 are determined by the BIOS  
or operating system. Each serial port uses 8 consecutive I/ O locations. The two ports  
reside in a single block of I/ O space in eight byte increments, for a total of 16  
contiguous bytes, as shown in Figure 7.  
Channel  
Port 1  
I/ O Address Range  
Base Address + 0 to Base Address + 7  
Base Address + 8 to Base Address + 15  
Port 2  
Figure 7 --- Port Address Map  
All two serial ports share the same IRQ. The DSC-200/ 300 signals a hardware  
interrupt when any port requires service. The interrupt signal is maintained until no  
port requires service. Interrupts are level-sensitive on the PCI bus.  
The base address and IRQ are automatically detected by the device drivers  
Quatech supplies for various operating systems. For cases where no device driver is  
available, such as for operation under DOS, Quatech supplies the "QTPCI" DOS  
software utility for manually determining the resources used. See page 17 for details.  
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4.2 Enabling the Special Registers  
The DSC-200/ 300 contains two unique registers, an Interrupt Status Register and  
an Options Register. These registers are enabled when the SPAD jumper (J13) is  
removed (factory default). They replace the UART Scratchpad Register on accesses to  
register address 7.  
The Interrupt Status Register and Options Register are accessed through the  
scratchpad location of any UART. The DLAB bit of the UART (Line Control Register,  
bit 7) is used to select between the two registers. The most recent write of a DLAB bit in  
any UART selects between the two registers as shown in Figure 8.  
Register selected for  
DLAB Bit SPAD Jumper  
address 7 accesses  
0
1
X
removed  
removed  
applied  
Interrupt Status Register  
Options Register  
Scratchpad Registers  
Figure 8 --- DLAB bit selects between special registers  
4.3 Interrupt Status Register  
The read-only Interrupt Status Register can be used to quickly identify which  
serial ports require servicing after an interrupt. Reading the Interrupt Status Register  
will return the interrupt status of the entire DSC-200/ 300, as shown in Figure 9. The  
individual bits are cleared as the interrupting ports are serviced. The interrupt service  
routine should ensure that the interrupt status register reads zero before exiting.  
Bit  
Description  
0 (not used)  
7 (MSB)  
6
5
4
3
2
1
0
0 (not used)  
0 (not used)  
0 (not used)  
0 (not used)  
0 (not used)  
Port 2 --- 1 if interrupt pending  
Port 1 --- 1 if interrupt pending  
Figure 9 --- Interrupt Status Register  
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4.4 Options Register  
The Options Register allows software to identify the DSC-200/ 300 as a Quatech  
Enhanced Serial Adapter. It also allows software to set the UART clock rate multiplier.  
Figure 10 shows the structure of the Options Register.  
The powerup default of the Options Register is all bits zero.  
Bit  
N am e  
Description  
ID bit 1  
7 (MSB)  
ID1  
6
5
4
3
2
1
0
ID0  
ID bit 0  
-
(reserved, 0)  
-
-
(reserved, 0)  
(reserved, 0)  
-
(reserved, 0)  
RR1  
RR0  
Clock rate multiplier bit 1  
Clock rate multiplier bit 0  
Figure 10--- Options Register bit definitions  
4.4.1 Enhanced Serial Adapter Identification  
The ID bits are used to identify the DSC-200/ 300 as a Quatech Enhanced Serial  
Adapter. Logic operations are performed such that the values read back from these bits  
will not necessarily be the values that were written to them. Bit ID1 will return the  
logical-AND of the values written to ID[1:0], while bit ID0 will return their  
exclusive-OR.  
Software can thus identify a Quatech Enhanced Serial Adapter by writing the ID  
bits with the patterns shown in the "write" column of Figure 11, then reading the bits  
and comparing the result with the patterns in the "read" column. Matching read  
patterns verify the presence of the Options Register.  
Write  
Read  
ID1 ID0 ID1 ID0  
0
0
1
1
0
1
0
1
0
0
0
1
0
1
1
0
Figure 11 --- ID bit write/ read table  
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4.4.2 Clock Rate Multiplier  
A standard serial port operates at a clock speed of 1.8432 MHz. In order to  
achieve higher data rates, Quatech Enhanced Serial Adapters can operate at two times,  
four times, or even eight times this standard clock speed. This is controlled by the  
clock rate multiplier bits in the Options Register.  
Software can determine the UART clock frequency by reading the clock rate  
multiplier bits RR1 and RR0 in the Options Register as shown in Figure 12. RR1 and  
RR0 can be set by writing to the Options Register if the X2, X4, and X8 jumpers (J10-J12)  
are all removed. If one of these jumpers is applied, the RR1 and RR0 bits are forced to  
the appropriate value. Reading the Options Register will always return the clock rate  
multiplier at which the board is operating.  
Clock Rate  
Multiplier  
UART Clock  
Frequency  
Maxim u m Data  
Rate  
RR1 RR0  
X1  
(default)  
X2  
0
0
1.8432 MHz  
115.2 kbaud  
0
1
1
1
0
1
3.6864 MHz  
7.3728 MHz  
14.7456 MHz  
230.4 kbaud  
460.8 kbaud *  
921.6 kbaud *  
X4  
X8  
* 16750 UART only  
Figure 12 --- Rate Register bit definition  
At powerup and reset, the Options Register is initialized to 0. The DSC-200/ 300  
will thus powerup in the x1 mode with software control of the clock rate multiplier  
enabled as long as the X2, X4, and X8 jumpers are not installed.  
Software can control high baud rates through a combination of changing the  
clock rate multiplier and the UART baud rate divisor. For example, a baud rate of  
230.4 kbps could be achieved by setting the clock rate multiplier to X2 mode (or by  
applying the X2 jumper) and setting a software application for 115.2 kbps.  
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5 Wind ow s Configuration  
5.1 Window s Millennium  
1. After inserting the DSC 200/ 300 for the first time the "Add New Hardware  
Wizard" will begin. Select "Search for the best driver for your device.". Check the  
"Removable media" and "Specify location" box. Click the "Next" button.  
3. Window will locate the proper INF file and copy the file from the CD. Click  
the "Next" button.  
4. The final dialog screen will verify the file copy from the CD. Click the  
"Finish" button.  
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5.2 Windows 2000  
1.  
After inserting a DSC-200/ 300 for the first time, the "Add New Hardware  
Wizard will appear at start up. Click the "OK" button.  
2. The following dialog box insert the Quatech COM CD (shipped with the device).  
Click the "OK" button.  
4.  
5.  
The following dialog box will display the appropriate INF file on the CD in  
drive. Click the "OK" button.  
Window will copy the INF file from the CD and display a final dialog  
indication that the process is complete. Click the "Finish" button.  
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5.3 Window s 98  
1.  
After inserting a DSC-200/ 300 for the first time, the "Add New Hardware  
Wizard will appear at start up. Click the "Next" button.  
2. Select "Search for the best driver for you device". Click the "Next" button.  
3.  
On the next dialog, select the "CD-ROM DRIVE" check box. Insert the Quatech  
COM CD (shipped with the device) into the CD-ROM drive.  
Click the "Next" button.  
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4.  
5.  
The following dialog box will display the appropriate INF file on the diskette in  
drive. Click the "Next" button.  
Window will copy the INF file from the diskette and display a final dialog  
indication that the process is complete. Click the "Finish" button.  
5.4 Window s 95  
The following instructions provide step-by-step instructions on viewing  
resources used by the DSC-200/ 300 in Windows 95 using the "Device Manager"  
utility. Select "Start" then "Help" from within Windows 95 for additional  
information.  
1. Double click the "System" icon inside the Control Panel folder. This opens up  
the System Properties box.  
2. Click the "Device Manager" tab located along the top of the System Properties  
box. This lists all hardware devices registered inside the Windows 95 registry.  
Additional information is available on any of these devices by click on the  
device name and then selecting the "Properties" button.  
3. Double click the device group "Multi-function Adapters". The DSC-200/ 300  
model name should appear in the list of Multi-function adapters.  
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4. Double click the DSC-200/ 300 model name and a properties box should open for  
the hardware adapter.  
5. Click the "Resources" tab located along the top of the properties box to view the  
resources Windows 95 has allocated for the DSC-200/ 300 match the hardware  
configuration. Because PCI is a true plug-and-play bus, do not attempt to  
modify the configuration values listed. Click "Cancel" to exit without making  
changes.  
6. The DSC-200/ 300 serial ports are also listed under the group Ports (COM and  
LPT). Windows 95 does not assign COM1-COM4 to ports addressed at  
nonstandard locations. The DSC-200/ 300 ports will be enumerated starting with  
COM5 (or higher) even if lower logical numbers are available.  
7. Select any of the Quatech Serial Ports listed under the group Port (COM and  
LPT) and click the "Properties" button. This action opens a properties dialog for  
the specific COM port on the DSC-200/ 300.  
8. Click the "Port Settings" tab and then click the "Advanced" button. The  
DSC-200/ 300 driver will display a custom Advanced Port Settings control, which  
allows the ports UART compatibility mode and FIFO threshold levels to be  
configured. The threshold values of full-scale for the transmit buffer and  
3/ 4-scale for the receive buffer shown below are optimal for most applications.  
Note that the FIFO option for each of the DSC-200/ 300's two ports is configured  
independently.  
9. Use the Logical COM Port names to access the serial ports on your DSC-200/ 300  
through your software applications. Note: The Logical COM Port name is  
assigned to your ports by Windows 95. This name is required by a Windows 95  
application when accessing a particular port.  
Windows 95 maintains a registry of all known hardware installed in your  
computer. Inside this hardware registry Windows 95 keeps track of all of your system  
resources, such as I/ O locations, IRQ levels, and DMA channels. The "Add New  
Hardware Wizard" utility in Windows 95 was designed to add new hardware and  
update this registry.  
An "INF" configuration file is included with the DSC-200/ 300 to allow easy  
configuration in the Windows 95 environment. Also a custom Windows 95 serial  
device driver is included with the DSC-200/ 300 to support the use of the 16750 UART's  
64 byte FIFO. Windows 95 uses the "INF" file to determine the system resources  
required by the DSC-200/ 300, searches for available resources to fill the boards  
requirements, and then updates the hardware registry with an entry that allocates these  
resources.  
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5.5 Using the "N ew H ard w are Found" Wizard  
The following instructions provide step-by-step instructions on installing the  
DSC-200/ 300 in Windows using the "New Hardware Found " wizard.  
1. After booting the computer with a newly-installed DSC-200/ 300, the "New  
Hardware Found" dialog box will appear. If you have never installed a Quatech  
PCI communications adapter before, the dialog box may simply indicate that it  
has found a "PCI Card."  
2. Select the radio button for "Driver from disk provided by hardware  
manufacturer." Click the "OK" button to continue.  
3. An "Install From Disk" dialog box should pop up. Insert the CD with the  
Quatech INF files on it, select the correct drive letter, and click the "OK" button.  
Windows automatically browses the root directory for an INF file that defines  
configurations for Multi-function Adapters. If no INF files are found, click the  
"Browse" button and search the Win95 sub directory on the installation diskette.  
You are not required to select the file name. After finding the directory  
containing the INF files, Windows will choose the correct file.  
4. The "New Hardware Found" dialog box will appear again, this time for an  
"Unknown Device."  
5. Again select the radio button for "Driver from disk provided by hardware  
manufacturer." Click the "OK" button to continue.  
6. Another "Install From Disk" dialog box will pop up. The path should already be  
pointing to the Quatech diskette. Click the "OK" button to continue.  
7. You should now see the "Copying Files" dialog box as Windows 95 copies the  
driver files from the diskette.  
8. The installation utility will ask for your Window installation disks. Serial  
communication ports require two drivers supplied by Microsoft to function:  
SERIAL.VXD and SERIALUI.DLL. Insert the disk or CD and click "OK".  
NOTE:  
You may be able to skip this step if you are certain that your system has the  
latest version of these files installed. If you do not have your Windows 95  
install CD immediately available, click "OK" anyway. A dialog box  
appears with an option to Skip the files. Click the Skip button and the files  
will not be installed. This is all right if the latest version of these drivers  
are currently in the \ WINDOWS\ SYSTEM directory.  
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9. The "New Hardware Found" dialog will repeat for each of the serial ports on the  
DSC-200/ 300 as each port is registered with Windows.  
10. Installation is complete.  
5.6 Wind ow s N T  
The Windows NT device driver is installed by running the SETUP program. Up  
to 256 serial ports are supported. There is a command line-based configuration utility  
which is used for adding PCI bus and ISA bus serial ports. Please refer to the  
documentation included with the device driver for full installation and configuration  
details.  
Device drivers for Windows and OS/ 2 are also available for the DSC-200/ 300.  
The board can be used under DOS and other operating systems as well in many  
circumstances. The software described below can be obtained from the Quatech web  
site if it did not come with the board.  
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6 DOS and Other Operating Systems  
The DSC-200/ 300 is not a direct drop-in replacement for a legacy serial port  
because its base address and IRQ cannot be fixed at values such as 3F8 hex, IRQ 4  
(COM1) or 2F8 hex, IRQ 3 (COM2), etc. Rather, the system BIOS assigns the address  
and the IRQ in a plug-and-play fashion at boot time. Software which is to use the  
DSC-200/ 300 must be able to accommodate any valid assignments of these resources.  
For Windows and OS/ 2, the Quatech device drivers determine what the  
resource assignments are and proceed accordingly. In other cases, however, the user  
must intervene. The discussion below will center on DOS, but the concepts can be  
applied to other operating systems as well.  
Many DOS applications support user configuration of the base address and IRQ  
of a serial port. Such applications can generally make use of the DSC-200/ 300. Older  
applications, as well as some custom software, may use hard-coded standard legacy  
serial port addresses. These applications will require modifications to support PCI  
devices.  
Custom applications for which the customer has source code can be modified to  
make just a few PCI BIOS function calls to obtain all the necessary configuration  
information. The PCI BIOS specification can be obtained from the PCI Special Interest  
Group. Contact Quatech technical support for more information.  
6.1.1 QTPCI.EXE  
Quatech's "QTPCI" utility supplies the information required when modifying  
the serial port settings of the application. This program should be run from real DOS,  
not in a Windows DOS box.  
Figure 15 shows the Basic Mode display for the DSC-200/ 300 after the "Q" key  
has been pressed. In this example, the DSC-200/ 300 uses I/ O base address FFA0 hex  
and IRQ 3. The hardware revision of the DSC-200/ 300 is also displayed. Pressing the  
"N" key will show similar information for all non-Quatech PCI devices in the system,  
including those devices integrated on the motherboard.  
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The QTPCI program is capable only of displaying the PCI configuration. It  
cannot be used to make changes.  
Quatech PCI Configuration Information Display Software  
Version 1.00  
INSTRUCTIONS:  
------------------------  
Press keys listed in the menu at the bottom of the screen.  
This program only displays information. It cannot make changes.  
Numbers preceeded by "0x" are hexadecimal.  
PCI BIOS detected, version 2.10  
Quatech PCI adapters detected  
---------------------------------------------  
DSC-200/300 Two-port RS-422/485 adapter  
Uses IRQ 3  
(Hardware Revision A1)  
Base addr 1 = 0xffa80  
_
I/O  
M - Change to Expert Mode  
Q - Quatech PCI adapters  
N - Other PCI devices  
X - EXIT  
Figure 15 --- QTPCI.EXE Basic Mode display  
Figure 16 shows the Expert Mode display for the DSC-200/ 300 after the "Q" key  
has been pressed. The information from the Basic Mode display is presented along  
with more details such as the Vendor and Device IDs, PCI Class Code, size of memory  
and I/ O regions, etc. Pressing the "N" key will show similar information for all  
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non-Quatech PCI devices in the system, including those devices integrated on the  
motherboard. In this example, the "Base addr 0" resource is reserved.  
For users interested in even more details, PCI BIOS information can be  
displayed by pressing the "B" key. Pressing the "I" key displays the PCI interrupt  
routing table.  
Quatech PCI Configuration Information Display Software  
Version 1.00  
Quatech PCI adapters detected  
---------------------------------------------  
DSC-200/300 Two-port RS-422/485 adapter  
Vendor ID 0x135c, Device id 0x0050 found in slot 0x04 on bus 0x00  
Device/function code = 0x98, Revision ID = 0x01 (Hardware revision A1)  
PCI Class Code = 0x070200 Communications controller, multiport serial  
Subsystem Vendor ID 0x135c, Subsystem Id 0x0050  
INTA# mapped to IRQ 11 (route 0x61)  
Base addr 0 = 0xfc80  
Base addr 1 = 0xffa80  
_
I/O  
I/O  
0X80 bytes allocated  
0X40 bytes allocated  
M - Change to Basic Mode  
B - PCI BIOS details  
I - Interrupt routing details  
Q - Quatech PCI adapters  
N - Other PCI devices  
X - EXIT  
Figure 16 --- QTPCI.EXE Expert Mode display  
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7 OS/ 2  
The OS/ 2 device driver supports up to 32 serial ports in a system. Installation is  
a manual, but simple, process. Please refer to the read me documentation included on  
the Quatech COM CD with the device driver for full installation and configuration  
details.  
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8 External Connections  
The DSC-200/ 300 provides four differential communication signals per channel.  
The two output signals are Transmit Data (TxD) and Auxiliary Output (AUXOUT). The  
two input signals are Receive Data (RxD) and Auxiliary Input (AUXIN). A ground  
signal is also provided.  
The available input signals for AUXIN are Clear To Send (CTS) and the Receive  
Clock (RCLK). The available output signals for AUXOUT are Request To Send (RTS),  
the Transmit Clock (XCLK), and the AUXIN signal (for loopback). Either half-duplex or  
full-duplex operation can be selected for each communications channel. If half-duplex  
operation is selected, one of the UART's signals (either DTR or RTS) is used to enable  
the transmitter drivers. The inverse of the transmitter enable can be used to enable the  
receiver drivers.  
Factory-installed resistors allow for signal line termination in compliance with  
the RS-422 and RS-485 standards. The desired termination can be selected or removed  
per port by applying a jumper.  
Configuration is done using jumpers J1 through J4 for termination selection, and  
jumpers J5 through J8 for interface signal routing. Each jumper block provides the  
same functions for its particular channel.  
Channel  
Port 1  
Termination  
J1, J2  
Signal routing  
J5, J6  
Port 2  
J3, J4  
J7, J8  
Figure 17 --- Jumper/ Channel correspondence  
XC LK 6  
3
2
RC LK  
AUXIN  
C TS  
Jumpers J5, J7  
Jumpers J6, J8  
5
4
AUXOUT  
RTS  
1
6
3
Rx ENAB LE  
Tx ENAB LE  
2 RTS  
Tx ENAB LE5  
Half-duplex  
if 3-6 shorted  
Tx ENAB LE  
4
1
DTR  
Figure 18 --- Pinout of jumpers J5-J8  
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8.1 RTS/ CTS Hand shake  
Transmission of RTS, combined with reception of CTS, allows for hardware  
handshaking (data flow control) between the UART and the external device. RTS is  
transmitted on AUXOUT by connecting pins 4 and 5 of the jumper block. CTS is  
received on AUXIN by connecting pins 1 and 2 of the jumper block. If RTS/ CTS  
handshaking is not desired, the RTS output can be looped back to the CTS input by  
connecting pins 1 and 4 of the jumper block. Figure 19 shows how to select the  
RTS/ CTS mode.  
Jumpers J5, J7  
3
2
XC LK 6  
RC LK  
AUXIN  
3
2
XC LK 6  
RC LK  
AUXIN  
AUXOUT 5  
5
4
AUXOUT  
RTS  
RTS  
4
1
C TS  
1
C TS  
Transmit RTS on AUXOUT  
Receive CTS on AUXIN  
Loopback RTS to CTS  
Figure 19 --- RTS/ CTS selection  
8.2 RCLK  
This is the clock signal used by the receiver portion of the UART. It is generally  
provided by connecting it to the UART's own transmit clock output (XCLK). This is  
done by connecting pins 3 and 6 of the jumper block. If desired, RCLK can be received  
from an external source over the AUXIN line by connecting pins 2 and 3 of the jumper  
block. Figure 20 shows how to select the RCLK mode.  
Jumpers J5, J7  
3
2
XC LK 6  
RC LK  
AUXIN  
6
5
4
3
2
XC LK  
AUXOUT  
RTS  
RC LK  
AUXIN  
AUXOUT 5  
RTS  
4
1
C TS  
1
C TS  
Loopback XCLK to RCLK  
Receive RCLK on AUXIN  
Figure 20 --- RCLK selection  
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8.3 XCLK  
This is the output clock signal used by the transmitter portion of the UART. It is  
generally connected to the UART's own receive clock input (RCLK). This is done by  
connecting pins 3 and 6 of the jumper block. If desired, XCLK can be transmitted to an  
external source over the AUXOUT line by connecting pins 5 and 6 of the jumper block.  
Figure 21 shows how to select the XCLK mode.  
Jumpers J5, J7  
3
2
XC LK 6  
RC LK  
AUXIN  
XC LK 6  
3
2
RC LK  
AUXIN  
C TS  
AUXOUT 5  
5
4
AUXOUT  
RTS  
RTS  
4
1
C TS  
1
Loopback XCLK to RCLK  
Transmit XCLK on AUXOUT  
Figure 21 --- XCLK selection  
8.4 AUXIN/ AUXOUT Loopback  
The AUXIN signal is an input from the external device, and connecting it to the  
AUXOUT signal provides for a loopback mode of operation. In other words, whatever  
signal is transmitted by the external device over the AUXIN line will be fed back to the  
external device over the AUXOUT line. This mode is accomplished by connecting pins  
2 and 5 of the jumper block. Figure 22 shows how to select this loopback mode.  
Jumpers J5, J7  
XC LK 6  
3
2
RC LK  
AUXIN  
C TS  
AUXOUT 5  
RTS  
4
1
Loopback AUXOUT to AUXIN  
Figure 22 --- AUXIN/ AUXOUT loopback  
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8.5 Half-Duplex/ Full-Duplex Selection  
Using jumper blocks J6 and J8, the transmitters and receivers of each channel can  
be enabled and disabled by modem control signals. This allows operation in both  
half-duplex or full-duplex modes.  
The transmit drivers can be controlled by either the Data Terminal Ready (DTR)  
or the Request to Send (RTS) output from the UART. If a jumper is applied between  
pins 1 and 4, the drivers are enabled for TxD and AUXOUT when the UART's DTR  
signal is asserted. If a jumper is applied between pins 2 and 5, the drivers are enabled  
for TxD and AUXOUT when the UART's RTS signal is asserted. If neither of these  
jumpers is applied, the drivers remain enabled at all times. When disabled, the  
transmit drivers enter a high-impedance state.  
The receivers can be controlled by the inverse of the transmit enable. If a jumper  
is applied between pins 3 and 6, the receivers for RxD and AUXIN will be disabled  
when the transmit drivers are enabled and vice-versa (based on the DTR or RTS  
connections on pins 1-4 or 2-5).  
To operate in half-duplex DTR mode, apply jumpers between pins 1 and 4 and  
pins 3 and 6. To operate in half-duplex RTS mode, apply jumpers between pins 2 and  
5 and pins 3 and 6.  
To operate in full-duplex mode, leave the jumpers in their factory default  
locations, installed in the spare locations of 4-5 and 6-only. The drivers and receivers  
are always enabled in full-duplex mode. Figure 23 shows how to select half- or  
full-duplex operation.  
WARN IN G:  
When operating in half-duplex mode, the transmitter  
drivers must be disabled before receiving any data.  
Failure to do so may result in multiple active output  
drivers being connected together, which may cause  
damage to the board, the computer, and the external  
device.  
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Jumpers J6, J8  
6
5
4
3
2
Tx ENABLE  
Tx ENABLE  
Tx ENABLE  
Rx ENABLE  
RTS  
Half-Duplex(DTR) Operation  
Half-Duplex(RTS) Operation  
Full-Duplex Operation  
1 DTR  
3
6
5
4
Rx ENABLE  
Tx ENABLE  
Tx ENABLE  
Tx ENABLE  
2 RTS  
1
3
DTR  
6
5
4
Rx ENABLE  
Tx ENABLE  
Tx ENABLE  
2 RTS  
Tx ENABLE  
1
DTR  
Figure 23 --- Half- or full-duplex selection  
AUXOUT  
RS-422 or  
RS-485  
Driver  
+
-
TXEN  
6
5
3
2
RS-422 or  
RS-485  
Receiver  
AUXIN  
+
-
4
1
RXEN  
XCLK  
RTS  
CTS  
RCLK  
DTR  
DSR  
DCD  
RI  
6
5
4
3
2
1
Figure 24 --- Output control block diagram  
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8.6 Termination Resistors  
Line termination resistors are provided for the input signals of each of the  
DSC-200/ 300's RS-422/ 485 ports. Termination may be selected or removed for  
individual signal lines using jumper blocks J1-J4.  
RS-422  
RS-485  
Rt = 100 ohm 1/2W  
Rt = 120 ohm 1/2W  
RS-422/485 Receiver  
+
RXD+  
RXD-  
AUXIN+  
Rt  
or  
-
AUXIN-  
Jumpers J1-J4  
3
3
2
1
3
2
1
2
1
no termination  
RS-485 termination  
(120 omhs)  
RS-422 termination  
(100 ohms)  
(factory default)  
Figure 25 --- RS-422/ 485 Line termination resistance values  
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8.7 RS-422/ 485 Peripheral Connection  
The DSC-200/ 300 connects to peripheral equipment through two female D-9  
connectors. The serial port connector definitions are listed in Figure 26.  
SignalDescription  
TxD+  
D-9 Connector Pin  
2
7
4
8
1
6
5
9
3
TxD-  
RxD+  
RxD-  
AUXOUT+  
AUXOUT-  
AUXIN+  
AUXIN-  
GND  
Figure 26 --- DSC-200/ 300 connector definitions  
5
9
4
8
3
7
2
6
1
D-9 connector  
(CN2 and CN3)  
Figure 27 --- DSC-200/ 300 output connectors  
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9 PCI Resource Map  
Listed below are the PCI resources used by the DSC-200/ 300. Such information  
may be of use to customers writing their own device drivers or other custom software.  
A detailed description of the DSC-200/ 300's UARTs is available on the Quatech web  
site.  
(all numbers in hex)  
PCI Vendor ID:  
PCI Device ID:  
PCI Class Code  
0x135C  
0x0030  
Quatech, Inc.  
DSC-200/ 300  
Base class: 0x07  
Simple communications controller  
Multiport serial controller  
Subclass:  
Interface:  
0x02  
0x00  
IRQ sourced by:  
Base address 0:  
Base address 1:  
INTA#  
0x80 bytes I/ O Reserved region  
0x10 bytes I/ O Serial ports  
Port 1 at offset 0x00  
Port 2 at offset 0x08  
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10Specifications  
Bus interface  
PCI, 32-bit bus, 5-volt only  
IBM-compatible computers  
Dimensions:  
approx. 5.5" x 3.5"  
Serial ports  
Controller:  
Interface:  
16750 with 64-byte FIFOs  
Two female D-9 connectors  
Transceivers:  
SP491 or compatible  
Differential output:  
2V min. with 50-ohm load (RS-422)  
1.5V min. with 27-ohm load (RS-485)  
Output rise/ fall time: 3ns min., 40ns max., 15ns typ.  
Differential input  
Threshold:  
Input resistance:  
Input current:  
-0.2V min., +0.2V max.  
12k ohm min., 15k ohm typ.  
+/ - 1.0mA max.  
Power requirements  
+5  
volts:  
approx. 320 mA  
Temperature:  
operating 0° to 70°  
storage -50° to 80°  
Humidity:  
10% to 90%  
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11 Troubleshooting  
Listed here are some common problems and frequent causes of those problems.  
If the information here does not provide a solution, contact Quatech technical support.  
Any unauthorized repairs or modifications will void the DSC-200/ 300's warranty.  
Computer will not boot up.  
1. Is the DSC-200/ 300 properly inserted? Remove the card and try again. Perhaps  
try a different expansion slot.  
2. Ensure that an ISA-bus card is not using the same IRQ that the PCI BIOS tries to  
assign to the DSC-200/ 300. Most computers have BIOS setup options to reserve  
IRQs for either ISA or PCI use. Try reserving the IRQ for the ISA card. The BIOS  
will automatically choose a different IRQ for the DSC-200/ 300. An address  
conflict is unlikely because most PCI-based computers will assign I/ O  
addresses in such a way that they cannot conflict with ISA-bus devices.  
3. The DSC-200/ 300 may be defective. Contact technical support for instructions.  
Cannot communicate w ith other equipment.  
1. Are the cable connections correct? Are the cables securely attached?  
2. Is the software configured with the correct base address and IRQ information for  
the DSC-200/ 300? (This is mainly a DOS issue.)  
3. Is the device driver installed?  
4. If you are trying to communicate with another DTE, a null-modem cable will be  
required.  
5. If possible, use a loopback connector to test the port.  
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DSC-200/ 300  
User's Manual  
Revision 1.20  
June 2001  
P/ N: 940-0145-120  
Quatech DSC-200/ 300 User's Manual  
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