Quatech RS-485 User Manual 2

DSC-200/300

Two Channel RS-422/485 Asynchronous

Communications Adapter

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.quatech.com

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. 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. Have this

information available when requesting warranty service.

DATE OF PURCHASE:

MODEL NUMBER: DSC-200/300

PRODUCT DESCRIPTION: Two Channel RS-422/485 Asynchronous

PCI Bus Communications Adapter

SERIAL NUMBER:

 1998 - 2006, 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.

Declaration of Conformity

Manufacturer's Name: Quatech Inc.

Manufacturer's Address: 5675 Hudson Industrial Parkway

Hudson, Ohio 44236 (USA)

Application of Council Directive: 89/336/EEC

Standards to which Conformity is Declared: * EN50081-1 (EN55022,

EN60555-2, EN60555-3) * EN50082-1 (IEC 801-2, IEC 801-3, & IEC 801-4)

Type of Equipment: Information Technology

Equipment

Equipment Class: Commercial, Residential, & Light Industrial

Product Name: PCI Dual Serial Communications

Card

Model Number : DSC-200/300 (IND)

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1 General Information

1.1 Features

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1.1.1 "IND" Option --- Surge Suppression Upgrade

2 Hardware Configuration

2.1 Signal Connections

2.2 Full-duplex/Half-duplex Operation

2.2.1 CTS0_SEL, CTS1_SEL (J10,17)

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2.2.2 AUX0_SEL1,0, AUX1_SEL1,0 (J12,11,19,18)

2.2.3 RCLK0_SEL, RCLK1_SEL (J13, 20)

..........................

2.2.4 TGL0_SEL1,0, TGL1_SEL1,0 (J15,14,22,21)

2.2.5 RXEN0_SEL, RXEN1_SEL (J16, 23)

2.3 Clock Rate and Optional Registers

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2.3.1 Enable Scratchpad Register (SPAD, J2)

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2.3.2 Force High-Speed UART Clock (X2, X4, or X8, J3-J5)

3 Hardware Installation 4 Address Map and Special Registers

4.1 Base Address and Interrupt Level (IRQ)

4.2 Enabling the Special Registers

4.3 Interrupt Status Register

4.4 Quatech Modem Control Register

4.5 Options Register

4.5.1 Enhanced Serial Adapter Identification

4.5.2 Clock Rate Multiplier

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5 6 6

7 7 7 9 9 9 9

9 10 10 10

13 13 14 14 15 16 16 17

5 Windows Configuration

5.1 Windows Millennium

5.2 Windows 2000

5.3 Windows 98

5.4 Windows 1995

5.5 Windows NT

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5.6 Viewing Resources with Device Manager

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5.6.1 Changing Resource Settings with Device Manager

6 Other Operating Systems

6.1 OS/2

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18 18 19 20 21 22 23 25

30 30

6.2 DOS and other operating systems

6.2.1 QTPCI.EXE

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30 31

7 External Connections

7.1 RTS/cts Handshake

7.2 RCLK

7.3 TCLK

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7.4 AUXIN/AUXOUT Loopback

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7.5 Half-Duplex/Full-Duplex/Auto-Toggle Selection

7.6 Termination Resistors

7.7 RS-422/485 Peripheral Connection

7.8 RS-422/485 Peripheral Connection

8 PCI Resource Map 9 Specifications

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10 Troubleshooting

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33 33 34 34 35 35 37 38 38

Quatech DSC-200/300 User's Manual 4

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 32 bytes. A special interrupt status register is provided to help software to manage the shared interrupt.

The DSC-200/300's serial ports use 16550 Universal Asynchronous Receiver/Transmitters (UARTs). These UARTs contain hardware buffers (FIFOs) which reduce processing overhead and allow higher data rates to be achieved. The 16550 contains a 16-byte FIFO and can transmit and receive data at a rate of up to 921,600 bits per second. The 16550 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.

Quatech DSC-200/300 User's Manual 5

1.1 Features

The standard DSC-200/300 implements each of its communication channels with a 16550 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. 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.

IND OptionPart Number

noDSC-200/300

yesDSC-200/300IND

Figure 1 --- DSC-200/300 Product Series Summary

Quatech DSC-200/300 User's Manual 6

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 optional features. These jumpers, located in a column at the end of the board opposite the D-type connectors, control how signals are routed from the UARTs to the connector, as well as full- or half- duplex operation and special options.

Any changes from the factory default should be made before installing the DSC-200/300 in the computer.

2.1 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 in section 7.

2.2 Full-duplex/Half-duplex Operation

jumper settings that control various hardware

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. Spare jumpers are installed in neutral positions. For details, refer to section 7.5.

The DSC-200/300 is shipped from the factory with each channel configured with No jumpers on J10-23. The following conditions occur: CTS=AUXIN, AUXOUT=RTS, RCLK=TCLK, TXEN=1 AND RXEN=1.

Quatech DSC-200/300 User's Manual 7

Jumpers J10-J23 define the options for this card:

SPAD

J10

J11

J12

J13

J14

J15

J16

J17

J18

J19

J20

J21

X2 CTS0_SEL AUX0_SEL0

AUX0_SEL1 RCLK0_SEL TGL0_SEL0

TGL0_SEL1 RXEN0_SEL

CTS1_SEL

AUX1_SEL0 AUX1_SEL1 RCLK1_SEL

TGL1_SEL0

J22

J23

TGL1_SEL1 RXEN1_SEL

Figure 2 - Right Card Edge Jumpers

Quatech DSC-200/300 User's Manual 8

2.2.1 CTS0_SEL, CTS1_SEL (J10,17)

With NO jumpers on J10 or J17 the mode selection is CTS=AUXIN. With Jumpers

installed the mode selection is CTS=RTS.

2.2.2 AUX0_SEL1,0, AUX1_SEL1,0 (J12,11,19,18)

With NO jumpers on J12 or J19 the mode selection is AUXOUT=RTS. With Jumpers

installed on J12 or J19 and NO jumpers installed on J11 or J18, the mode selection is AUXOUT=TCLK. With Jumpers installed on J12, J11 or J19, J18, the mode selection is AUXOUT=AUXIN.

2.2.3 RCLK0_SEL, RCLK1_SEL (J13, 20)

With NO jumpers on J13 or J20 the mode selection is RCLK=TCLK. With Jumpers

installed on J13 or J20 the mode selection is RCLK=AUXIN.

2.2.4 TGL0_SEL1,0, TGL1_SEL1,0 (J15,14,22,21)

With NO jumpers on J15,14, or J22,21 the mode selection is TXEN=1. With Jumpers

installed on J14 or J21 and NO jumpers on J15 or J22, the mode selection is TXEN=DTR. With Jumpers installed on J15 or J22 and NO jumpers on J14 or J21, the mode selection is TXEN=RTS. With Jumpers installed on J15, J14 or J22, J21, the mode selection is TXEN=”Auto Toggle”.

2.2.5 RXEN0_SEL, RXEN1_SEL (J16, 23)

With NO jumpers on J16 or J23 the mode selection is RXEN=1. With Jumpers installed

on J16 or J23 the mode selection is RCLK=!TXEN.

Quatech DSC-200/300 User's Manual 9

2.3 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.

SPAD

X8 J4 J5

Figure 3 --- Factory default clock rate and options settings

2.3.1 Enable Scratchpad Register (SPAD, J2)

In the default configuration, an Interrupt Status Register and an Options Register (see page 15) 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.

SPAD

J4 J5

X8 X4

Figure 4 --- Enable scratchpad registers

2.3.2 Force High-Speed UART Clock (X2, X4, or X8, J3-J5)

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 section 4.5).

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.

Quatech DSC-200/300 User's Manual 10

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.

Figure 5 --- Clock multiplier jumper options

SPAD

J4 J5

Factory defaults

J4 J5

X8 mode

X8 X4

X4 mode

SPAD

J4 J5

X8 X4

X2 mode

Quatech DSC-200/300 User's Manual 11

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. 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 a pair of 9-pin D-connectors.

Serial

Port

Serial

Port

Figure 6 --- Jumper/connector locations

Quatech DSC-200/300 User's Manual 12

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