DSC-100 Two Channel RS-232 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.
WARRANTY INFORMATION Quatech, Inc. warrants the DSC-100 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. Any damage that results from improper installation, operation, or general misuse voids all warranty rights. Please complete the following information and retain for your records.
(c) 1998 - 2001, 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.
Declaration of Conformity Manufacturer's Name: Quatech Inc.
1 General Information ........................................ 5 1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1.1 "IND" Option --- Surge Suppression Upgrade . . . . . . . . . . . 6 2 Hardware Configuration 2.1 2.2 2.3 2.4 ................................. Factory Default Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Enable Scratchpad Register (SPAD, J8) . . . . . . . . . . . . . . . . . . .
1 General Information The Quatech, Inc. DSC-100 provides two RS-232 asynchronous serial communication interfaces for IBM-compatible personal computer systems using the PCI expansion bus. The DSC-100 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-100 requires no hardware configuration.
1.1 Features The standard DSC-100 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, Quatech offers the following board upgrades: 1.1.1 "IND" Option --- Surge Suppression Upgrade The "IND" option provides the protection essential for reliable use in an industrial environment.
2 Hardware Configuration The DSC-100 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 optional jumper settings that control various hardware features. Jumpers J5-J8 are grouped together at the end of the board opposite the D-9 connectors. Any changes from the factory default should be made before installing the DSC-100 in the computer. 2.
2.3 Force High-Speed UART Clock (X2, X4, or X8, J5-J7) These jumpers force an increase of the UART input clock frequency by a factor of two, four, or eight. This 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 12).
2.4 DTE/DCE Selection To simplify connections to other devices, each port on the DSC-100 is equipped with a jumper block that allows the port to be configured as either a DTE- or DCE-type device. This allows the DSC-100 to connect to either DTE- or DCE-type devices without using a null modem cable. The DTE/DCE selection jumper blocks are illustrated in Figure 5. J2 is used for serial port 1, closest to the bottom of the board. J1 is used for serial port 2, closest to the top of the board.
3 Hardware Installation 1. Turn off the power of the computer system in which the DSC-100 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-100 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.
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-100. 4.1 Base Address and Interrupt Level (IRQ) The base address and IRQ used by the DSC-100 are determined by the BIOS or operating system. Each serial port uses 8 consecutive I/O locations.
4.2 Enabling the Special Registers The DSC-100 contains two unique registers, an Interrupt Status Register and an Options Register. These registers are enabled when the SPAD jumper (J8) 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 either UART. The DLAB bit of the UART (Line Control Register, bit 7) is used to select between the two registers.
4.4 Options Register The Options Register allows software to identify the DSC-100 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 RS-232 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.
5 Windows Configuration 5.1 Windows Millennium 1. After inserting the DSC-100 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. 2. Window will locate the proper INF file and copy the file from the CD. Click the "Next" button. The final dialog screen will verify the file copy from the CD. Click the "Finish" button. 3.
5.2 Windows 2000 1. After inserting a DSC-100 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 Communications Driver CD (shipped with the device). Click the "OK" button. 3. The following dialog box will display the appropriate INF file on the CD in drive. Click the "OK" button. 4. Window will copy the INF file from the diskette and display a final dialog indication that the process is complete.
5.3 Windows 98 1. After inserting a DSC-100 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 Communication Drivers CD (shipped with the device) into the CD - ROM drive. 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 indication that the process is complete. Click the "Finish" button. 5.4 Windows 1995 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.
1. After booting the computer with a newly-installed DSC-100, 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.
5.5 Windows NT 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. 5.
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-100's two ports is configured independently. 9. Use the Logical COM Port names to access the serial ports on your DSC-100 through your software applications. Note: The Logical COM Port name is assigned to your ports by Windows 95.
6 DOS and Other Operating Systems The DSC-100 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-100 must be able to accommodate any valid assignments of these resources.
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.
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 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 DSC-100 User's Manual 24
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 documentation included with the device driver for full installation and configuration details. Device drivers for Windows NT and OS/2 are also available for the DSC-100. The board can be used under DOS and other operating systems as well in many circumstances. The software described below can be downloaded from the Quatech web site if it did not come with the board.
8 External Connections RS-232-C devices are classified by their function as either Data Terminal Equipment (DTE) or Data Communication Equipment (DCE). Generally, data terminal equipment is defined as the communication source and data communication equipment is defined as the device that provides a communication channel between two DTE-type devices.
The DSC-100 is a DTE device which connects to peripheral equipment through two male D-9 connectors. An adapter cable providing two male D-25 connectors is available. The standard serial port connections are listed in Figure 19.
9 PCI Resource Map Listed below are the PCI resources used by the DSC-100. Such information may be of use to customers writing their own device drivers or other custom software. A detailed description of the DSC-100's UARTs is available on the Quatech web site. (all numbers in hex) PCI Vendor ID: 0x135C Quatech, Inc.
10 Specifications Bus interface PCI, 32-bit bus, 5-volt only IBM-compatible computers Dimensions: approx. 5.0" x 3.7" Serial ports Controller: Interface: Transmit drivers: High-level output: Low-level output: Switching speed low-to-high: high-to-low: 16750 with 64-byte FIFOs Two male D-9 connectors, or two male D-25 connectors optional using adapter cables SN75150 or compatible +5V min, +8V typical -5V max, -8V typical 1.4 µs with 2500 pF load 40 ns with 15 pF load 1.
Data Rate (kbaud) 921.6 460.8 230.4 115.2 4% trans time N/A 100 330 800 Maximum Load (pF) 10% 15% 20% trans trans trans time time time 100 200 430 430 670 900 1000 1200 1670 1670 3500 4400 25% trans time 470 1000 2100 5030 Note 1: The signal transition time ratio is defined as the percentage of the unit interval or bit time (the inverse of the data rate) that is occupied by the signal transitioning from -3V to +3V.
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-100's warranty. Computer will not boot up. 1. Is the DSC-100 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-100.
DSC-100 User's Manual Revision 1.
