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DS-200/300
Two Channel RS-422/485 Asynchronous
Enhanced Serial Adapter
for ISA compatible machines
INTERFACE CARDS FOR IBM PC/AT AND PS/2
User's Manual
QUATECH, INC. TEL: (330) 655-9000
5675 Hudson Industrial Parkway FAX: (330) 655-9010
Hudson, Ohio 44236 http://www.quatech.com
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Warranty Information Quatech Inc. warrants the DS-200/300 to be free of defects for one (1) year from the date of purchase. Quatech Inc. will repair or replace any adapter 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. The authors have taken due care in the preparation of t
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© 1998, 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
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(This Page Intentionally Left Blank) DS-200/300 User's Manual iii
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Table of Contents 1. General Information ..................................... 1-1 2. Installation .............................................. 2-1 3. Windows 95 Configuration ............................... 3-1 3.1 Using the Add New Hardware Wizard .................................................... 3-1 3.2 Viewing and Changing Resources with Device Manager ................................ 3-3 4. Addressing Ports ......................................... 4-1 4.1 Setting the address .....
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1. General Information The Quatech, Inc. DS-200/300 provides two RS-422/RS-485 asynchronous serial communication interfaces for IBM-compatible personal computer systems using the 16-bit ISA (Industry Standard Architecture) expansion bus. The DS-200/300's serial ports are implemented using 16550 or 16750 Universal Asynchronous Receiver/Transmitters (UARTs). The 16550 UARTs enable the DS-200/300 to transmit and receive data at a rate of up to 230.4 kbaud; the 16750 UARTs enable data rates of up
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(This Page Intentionally Left Blank) 1-2 Quatech Inc.
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2. Installation If the default address and interrupt settings are sufficient, the DS-200/300 can be quickly installed and put to use. The factory defaults are listed in Figure 1. PORT ADDRESS IRQ ENABLED Serial 0 3F8 hex 4 YES Serial 1 2F8 hex 3 YES Figure 1 --- Default address and IRQ settings for DS-200/300 The output of the DS-200/300 is two 9-pin D-connectors labeled CN1 (serial 0) and CN2 (serial 1). 1. If the default settings are correct, skip to step 2, otherwise refer to sections 4 an
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Figure 2 --- Photo of DS-200/300 2-2 Quatech Inc.
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3. Windows 95 Configuration 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 DS-200/300 Enhanced Serial Adapter to allow easy configuration in the Windows 95 environ
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4. A hardware types list box should appear. Find the “Multi-function Adapters” type on the list and click it. Click the “Next” button to continue. 5. A list box opens with Manufacturers on the left and the associated board Models on the right. Click the “Have Disk” button. 6. An Install From Disk dialog box should pop up. Insert the diskette with the Quatech INF files on it, select the correct drive letter, and click the “OK” button. Windows 95 automatically browses the root directory for an
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10. Another dialog box will open to tell you that the installation is complete. Click the “Finish” button to end the software part of the installation. 11. Windows 95 now instructs you to shut down your computer and install the hardware. Click “Yes” to shut down your computer. Wait until Windows 95 informs you that it is safe to turn your computer off. When this message appears, power down your computer. 12. You are required to manually configure the DS-200/300 to match the resources allocate
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Figure 3--- Windows 95 Device Manager 4. Double click the DS-200/300 Enhanced Serial Adapter 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. Confirm that the resources Windows 95 has allocated for the DS-200/300 match the hardware configuration. To modify any of the resource settings click the resource name and click the “Change Setting” button. If the “Automatic Settings” option is selected, it wil
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7. The DS-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 DS-200/300 ports will be enumerated starting with COM5 (or higher) even if lower logical numbers are available. 8. 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 DS-200/300. 9. Click th
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4. Addressing Ports 4.1 Setting the address The base address of each port of the DS-200/300 is set using two DIP switch packs. When setting the address selection switches, a switch in the "ON" position specifies that the corresponding address line must be a logic 0 for the port to be selected. Similarly, a switch in the "OFF" position forces the corresponding address line to be a logic 1 for the port to be selected. A full sixteen bit address decode is implemented to reduce the chance of add
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Switch on Switch off Serial 0 uses SW1 and SW2 bit = 1 bit = 0 Serial 1 uses SW3 and SW4 Factory default setting for Serial 1 --- 03F8 hex (COM1) enable/disable SW1 SW2 ON ON 12 34 56 78 12 34 56 00 0 002 0 1 82 4 1 8 0 3 F 8 Factory default setting for Serial 2 --- 02F8 hex (COM2) enable/disable SW3 SW4 ON ON 12 34 56 78 12 34 56 821 8 00 0 002 0 0 4 F 0 2 8 enable/disable Example: 03E8 hex (typical for COM3) ON ON 12 34 56 78 12 34 56 820 8 00 0 002 0 1 4 E 0 3 8 enable/disable Example: 0
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The standard addresses for serial ports COM1 and COM2 are listed in Figure 7. Recommended addresses for serial ports COM3 and COM4 are also listed. The switch settings for these addresses are shown in Figure 6. PORT TYPICAL I/O ADDRESS NOTES COM1 03F8 hex Factory default for Serial 0. COM2 02F8 hex Factory default for Serial 1. COM3 03E8 hex Recommendations only. No official standards exist for COM3 and COM4. COM4 02E8 hex Figure 7 --- Recommended addresses for serial ports 4.2 Enabling or dis
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5. Data Rate Multiplier A standard RS-422/485 serial port operates at a clock speed of 1.8432 MHz. In order to achieve higher data rates, the DS-200/300 Enhanced Serial Adapter can operate at two times, four times (16750 UART only), or even eight times (16750 UART only) this standard clock speed. The user can set this speed, known as the data rate multiplier, in two different ways: by modifying hardware jumper settings or by writing to a DS-200/300 register known as the Options Register. 5.1
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5 OR5 not used 4 OR4 not used 3 OR3 not used 2 OR2 not used 1 RR1 rate register bit 1 0 RR0 rate register bit 0 Figure 9--- Options Register bit definitions WRITE READ ID1 ID0 ID1 ID0 0 0 0 0 0 1 0 1 1 0 0 1 1 1 1 0 Figure 10 --- ID bit write/read table The rate register allows software applications to check and set the data rate multiplier. As long as the SW jumper is installed in jumper block J9, the DS-200/300 gets the data rate multiplier from the value stored in the rate register portion o
