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DS C - 200 /300 Two Channel RS- 422/485 Asynchronous Communications Adapte r for PCI bus User's Manual QUATECH, INC. TEL: (330) 655-9000 5675 Hudson Industrial Parkway FAX: (330) 655-9010 Hudson, Ohio 44236 http://www.
WARRANTY INFORMATION Quatech, Inc. warrants the DSC-200/300 to be free of defects for five (5) years from the date of purchase. Quatech, Inc. will repair or replace any board that fails to perform under normal operating conditions and in accordance with the procedures outlined in this document during the warranty period.
(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.
Declaration of Conformity Manufacturer's Name: Quatech Inc. Manufacturer's Address: 5 5675 Hudson Industrial Parkway Hudson, Ohio 44236 (USA) Application of Council Directive: 89/336/EEC Sta.
32 8.5 Half-Duplex/Full-Duplex Selection ......................... 31 8.4 AUXIN/AUXOUT Loopback ................................ 31 8.3 XCLK .......................................................... 30 8.2 RCLK .......................................
38 11 Troubleshooting ......................................... 37 10 Specifications .............................................. 36 9 PCI Resource Map .......................................... 35 8.7 RS-422/485 Peripheral Connection ..............
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.
1 . 1 Features T he standard DSC-200/300 implements each of its communication channels with a 16750 UART and uses standard line driver and receiver components.
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.
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.
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 sub sections to set optional features.
2 . 4 . 2 Force High-Speed UART Clock (X2, X4, or X8, J 10 -J 12 ) 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.
3 Hardware 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 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 .
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.
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.
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.
5 Windows Configuration 5 . 1 Windows Mille nnium 1. After inserting the D SC 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.
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. C lick the "OK" button. 2. The following dialog box insert the Quatech COM CD (shipped with the device). Click the "OK" button.
5 . 3 Windows 98 1. After inserting a DSC-200/300 for the first time, the "Add New Hardware Wizard will appear at start up. C l ick the "Next" button. 2. Select "Search for the best driver for you device". Click the "Next" button.
4. The following dialog box will display the appropriate INF file on the diskette in drive. Click the "Next" button. 5. Window will copy the INF file from the diskette and display a final dialog indic ation that the process is complete. Click the "Finish" button.
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.
5 . 5 Using the " New Hardware Found" Wizard The following instructions provide step-by-step instructions on installing the DSC-200/300 in Windows using the "New Har dware Found " wizard. 1. After booting the computer with a newly-installed DSC-200/300, the "New Hardware Found" dialog box will appear.
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 Windows NT The Windows NT device driver is installed by running the SETUP program.
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.
The QTPCI program is capable only of displaying the PCI configuration. It cannot be used to make changes. Q - Quatech PCI adapters N - Other PCI devices X - EXIT M - Change to Expert Mode Quatech PCI Configuration Information Display Software Version 1.
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.
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.
8 External Connections The DS C-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).
8 . 1 RTS/CTS Handshake 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.
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).
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.
Full-Duplex Operation 1 2 3 6 5 4 RTS DTR Tx ENABLE Tx ENABLE Tx ENABLE Rx ENABLE Half-Duplex(DTR) Operation 1 2 3 6 5 4 RTS DTR Tx ENABLE Tx ENABLE Tx ENABLE Rx ENABLE Half-Duplex(RTS) Operation 1 2 .
8 . 6 Termination Resistors Line termination resistors are provided for the input s ignals of each of the DS C -200/300 's RS-422/485 ports. Termi nation may be selected or removed for individual signal lines using jumper blocks J1-J4.
8 . 7 RS-422/485 Peripheral Connection The DS C -200/300 connects to peripheral equipment through two female D-9 connectors. The serial port connector definitions are listed in Figure 26 .
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.
10 Specifications Bus interface PCI, 32 -bit bus , 5-volt only IBM - compatible computers Dimensions: approx. 5.5 " x 3. 5 " Serial ports Controller: 16750 with 64-byte FIFOs Interface: Two female D-9 connectors Trans ceivers : S P491 or compatible Differential output: 2V min.
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 DS C -200/300's warranty.
DSC-200/300 User's Manual Revision 1.21 March 2004 P/N: 940-0145-121 Quatech DSC -200/300 User ' s Manual 39.
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