Access PCI-COM422-4 User Manual

ACCES I/O PRODUCTS INC

10623 Roselle Street, San Diego, CA 92121 TEL (858)550-9559 FAX (858)550-7322

MODEL PCI-COM422/4

USER MANUAL

FILE: MPCICOM422-4.E1b

Notice

The information in this document is provided for reference only. ACCES does not assume any liability arising out of the application or use of the information or products described herein. This document may contain or reference information and products protected by copyrights or patents and does not convey any license under the patent rights of ACCES, nor the rights of others.

IBM PC, PC/XT, and PC/AT are registered trademarks of the International Business Machines Corporation.

Page iii

Warranty

Prior to shipment, ACCES equipment is thoroughly inspected and tested to applicable specifications. However, should equipment failure occur, ACCES assures its customers that prompt service and support will be available. All equipment originally manufactured by ACCES which is found to be defective will be repaired or replaced subject to the following considerations.

Terms and Conditions

If a unit is suspected of failure, contact ACCES' Customer Service department. Be prepared to give the unit model number, serial number, and a description of the failure symptom(s). We may suggest some simple tests to confirm the failure. We will assign a Return Material Authorization (RMA) number which must appear on the outer label of the return package. All units/components should be properly packed for handling and returned with freight prepaid to the ACCES designated Service Center, and will be returned to the customer's/user's site freight prepaid and invoiced.

Coverage

First Three Years: Returned unit/part will be repaired and/or replaced at ACCES option with no charge for labor or parts not excluded by warranty. Warranty commences with equipment shipment.

Following Years: Throughout your equipment's lifetime, ACCES stands ready to provide on-site or in-plant service at reasonable rates similar to those of other manufacturers in the industry.

Equipment Not Manufactured by ACCES

Equipment provided but not manufactured by ACCES is warranted and will be repaired according to the terms and conditions of the respective equipment manufacturer's warranty.

General

Under this Warranty, liability of ACCES is limited to replacing, repairing or issuing credit (at ACCES discretion) for any products which are proved to be defective during the warranty period. In no case is ACCES liable for consequential or special damage arriving from use or misuse of our product. The customer is responsible for all charges caused by modifications or additions to ACCES equipment not approved in writing by ACCES or, if in ACCES opinion the equipment has been subjected to abnormal use. "Abnormal use" for purposes of this warranty is defined as any use to which the equipment is exposed other than that use specified or intended as evidenced by purchase or sales representation. Other than the above, no other warranty, expressed or implied, shall apply to any and all such equipment furnished or sold by ACCES.

Page iv

Table of Contents

Chapter 1: Introduction .............................................. 1-1

RS422 Balanced Mode Operation ......................................... 1-1

COM Port Compatibility .................................................. 1-1

Communication Mode ................................................... 1-1

Baud Rate Ranges ..................................................... 1-2

Specifications ......................................................... 1-2

Chapter 2: Installation .............................................. 2-1

CD Installation ......................................................... 2-1

3.5-Inch Diskette Installation .............................................. 2-1

Directories Created on the Hard Disk ....................................... 2-2

Installing the Card ...................................................... 2-4

Input/Output Connections ................................................ 2-5

Chapter 3: Option Selection .......................................... 3-1

Chapter 4: Address Selection ......................................... 4-1

Chapter 5: Programming ............................................. 5-1

Sample Programs ...................................................... 5-1

Windows Programming .................................................. 5-1

Initialization ........................................................... 5-1

Reception ............................................................ 5-3

Transmission .......................................................... 5-4

Chapter 6: Connector Pin Assignments ................................ 6-1

Page v

List of Figures

Figure 1-1: PCI-COM422/4 Block Diagram ................................ Page 1-3

Figure 3-1: Simplified Termination Schematic .............................. Page 3-1

Figure 3-2: PCI-COM422/4 Option Selection Map ........................... Page 3-3

List of Tables

Table 5-1: Baud Rate Divisor Values ..................................... Page 5-2

Table 6-1: Connector Pin Assignments ................................... Page 6-1

Page vi

Chapter 1: Introduction

The PCI-COM422/4 Serial Interface Card was designed for effective transmission in RS422 (EIA422) protocol. The card is 6.1 inches long and may be installed in PCI-bus slots of IBM PC or compatible computers. The card features four independent, asynchronous RS422 serial ports, type 16550 buffered UARTs, and, for Windows compatibility, automatic control to transparently enable/disable the transmission drivers.

There are two I/O connector options. The standard model PCI-COM422/4 includes a single DB25 male connector on the mounting bracket plus a breakout cable that terminates in four 9-pin female connectors. Optional model PCI-COM422/4S1 has two 9-pin male connectors on the card mounting bracket plus a second mounting bracket with two more 9-pin male connectors with ribbon cables to connect them to headers on the card.

RS422 Balanced Mode Operation

The PCI-COM422/4 supports RS422 communications and uses differential balanced drivers for long range and noise immunity. PCI-COM422/4 also has the capability to add load resistors to terminate the communications lines. RS422 communications requires that a transmitter supply a bias voltage to ensure a known "zero" state. Also, receiver inputs at each end of the network should be terminated to eliminate "ringing". The PCI-COM422/4 supports biasing by default and supports termination by jumpers on the card. If your application requires the transmitter to be un-biased, please contact the factory.

COM Port Compatibility

Type 16550 UARTs are used as the Asynchronous Communication Element (ACE). These include a 16-byte transmit/receive buffer to protect against lost data in multitasking operating systems, while maintaining 100 percent compatibility with the original IBM serial port. The system assigns the address(es).

A crystal oscillator is located on the card. This oscillator ensures precise selection of baud rates up to 115,200 or, by changing a jumper, up to 460,800 with the standard crystal oscillator.

The driver/receiver used, the SN75176B, is capable of driving extremely long communication lines at high baud rates. It can drive up to ±60 mA on balanced lines and receive inputs as low as 200 mV differential signal superimposed on common mode noise of +12 V or -7 V. In case of communication conflict, the driver/receivers feature thermal shutdown.

Communication Mode

PCI-COM422/4 supports Full-Duplex and Half-Duplex communications with a 4-wire cable connection. Half-Duplex allows traffic to travel in both directions, but only one way at a time.

Manual MPCICOM422-4.E1b

Page 1-1

PCI-COM422/4 Manual

Baud Rate Ranges

The card has capability for two baud rate ranges and you can select which you wish to use on a port-by-port basis. One range is for up to 115,200 baud applications and the other is up to 460,800 baud applications.

Specifications

Communications Interface

• I/O Connection: 9-pin D-sub connectors

• Serial Ports: Four shielded male D-sub 9-pin IBM AT style connectors compatible with RS422 specifications. (Note: On model an external "spider" or breakout cable terminates with four female D-sub 9-pin connectors.)

• Character length: 5, 6, 7, or 8 bits.

• Parity: Even, odd or none.

• Stop Interval: 1, 1.5, or 2 bits.

• Serial Data Rates: Up to 115,200 baud, Asynchronous, A faster range of rates up to 460,800, is achieved by jumper selection on the card. Type 16550 buffered UART.

• Address: Continuously mappable within 0000 to FFFF (hex) range of PCI bus addresses (Conforms to PCI Specification 2.1).

• Receiver Input Sensitivity: ±200 mV, differential input.

• Common Mode Rejection: +12V to -7V

• Transmitter Output Drive Capability: 60 mA, with thermal shutdown.

Environmental

• Operating Temperature Range: 0 °C. to +60 °C.

• Storage temperature Range: -50 °C. to +120 °C.

• Humidity: 5% to 95%, non-condensing.

• Size: 6.1" long (155 mm) by 3.9" (99 mm).

• Power Required: +5VDC at 125 mA typical, -12VDC at 5 mA typical, +12VDC at 5 mA typical, 750 mW total power consumption.

Page 1-2

Manual MPCICOM422-4.E1b

Figure 1-1: PCI-COM422/4 Block Diagram

(Only One Serial Channel Shown)

Manual MPCICOM422-4.E1b

Page 1-3

+ 19 hidden pages