Quatech Asynchronous Communications Adapter... User manual

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:

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: 55675 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 (750,IND)

328.5 Half-Duplex/Full-Duplex Selection ......................... 318.4 AUXIN/AUXOUT Loopback ................................ 318.3 XCLK .......................................................... 308.2 RCLK .......................................................... 308.1 RTS/cts Handshake .......................................... 29

8 External Connections .....................................

7 OS/2 ............................................................

256.1.1 QTPCI.EXE ................................................. 25

6 DOS and Other Operating Systems ..................

245.6 Windows NT ................................................. 235.5 Using the "New Hardware Found" Wizard ................ 215.4 Windows 95 .................................................. 205.3 Windows 98 ................................................... 195.2 Windows 2000 ................................................ 185.1 Windows Millennium ........................................ 18

5 Windows Configuration .................................

174.4.2 Clock Rate Multiplier ..................................... 164.4.1 Enhanced Serial Adapter Identification ................. 164.4 Options Register .............................................. 154.3 Interrupt Status Register ..................................... 154.2 Enabling the Special Registers .............................. 144.1 Base Address and Interrupt Level (IRQ) ................... 14

4 Address Map and Special Registers .................

3 Hardware Installation ....................................

2.4.2 Force High-Speed UART Clock (X2, X4, or X8,

J10-J12) ...........................................................

112.4.1 Enable Scratchpad Register (SPAD, J13) ................. 112.4 Clock Rate and Optional Registers .......................... 102.3 Full-duplex/Half-duplex Operation ........................ 102.2 Signal Connections ........................................... 92.1 RS-422 or RS-485 Signal Line Termination .................. 9

2 Hardware Configuration .................................

81.1.1 "IND" Option --- Surge Suppression Upgrade ........... 81.1 Features ........................................................ 7

1 General Information ........................................

11 Troubleshooting .........................................

10 Specifications ..............................................

9 PCI Resource Map ..........................................

358.7 RS-422/485 Peripheral Connection .......................... 348.6 Termination Resistors ........................................

1General 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. Aspecial 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.

Quatech DSC

-200/300 User

s Manual

1.1Features

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"IND"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 40A20us peak transient surges, a clamping voltage of 30V and a peak

energy dissipation of 0.1 Joules.

Quatech DSC

-200/300 User

s Manual

2Hardware 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-9connectors, control special options.

Any changes from the factory default should be made before installing the

DSC-200/300 in the computer.

2.1RS-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.

RS-422 termination

(100 ohms)

(factory default)

Jumpers J1-J4

Figure 1--- Factory default signal termination settings

Quatech DSC

-200/300 User

s Manual

2.2Signal 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.

2.3Full-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.

Loopback RTS to CTS

Loopback AUXOUT to AUXIN

Loopback XCLK to RCLK

CTS

AUXIN

XCLK

RTS

AUXOUT

RCLK

Full Duplex Operation

RTS

DTR

Tx ENABLE

Tx ENABLE Rx ENABLE

(spare jumpers supplied)

JumpersJ5,J7

JumpersJ6,J8

Figure 2--- Factory default signal interface settings

Quatech DSC

-200/300 User

s Manual

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