IBM LPCI-COM232-4, LPCI-COM-4SM, LPCI-COM-8SM, LPCI-COM232-8 User Manual

10623 Roselle Street, San Diego, CA 92121 • [phone] • FAX [phone]

[e-mail] • www.accesio.com

MODEL LPCI-COM-8SM

LPCI-COM-4SM
LPCI-COM232-8
LPCI-COM232-4

USER MANUAL

FILE: MLPCI-COM-8SM.B1f

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Manual LPCI-COM-8SM

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.

Printed in USA. Copyright 2004, 2005 by ACCES I/O Products Inc, 10623 Roselle Street, San Diego, CA

92121. All rights reserved.

WARNING!!

ALWAYS CONNECT AND DISCONNECT YOUR FIELD CABLING WITH

THE COMPUTER POWER OFF. ALWAYS TURN COMPUTER POWER

OFF BEFORE INSTALLING A CARD. CONNECTING AND

DISCONNECTING CABLES, OR INSTALLING CARDS INTO A SYSTEM

WITH THE COMPUTER OR FIELD POWER ON MAY CAUSE DAMAGE

TO THE I/O CARD AND WILL VOID ALL WARRANTIES, IMPLIED OR

EXPRESSED.

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Manual LPCI-COM-8SM

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.

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Manual LPCI-COM-8SM

Table of Contents

Chapter 1: Introduction................................................................................................. 6

Specifications ............................................................................................................ 8

Figure 1-1: Block Diagram (Only one serial channel shown) .................................. 9

Chapter 2: Installation................................................................................................. 10

Chapter 3: Option Selection....................................................................................... 12

Figure 3-1: Simplified Termination Schematic....................................................... 12

Figure 3-2: Option Selection Map.......................................................................... 14

Chapter 4: Address Selection .................................................................................... 16

Chapter 5: Programming............................................................................................ 17

Table 5-1: Baud Rate Divisor Values..................................................................... 18

Chapter 6: Connector Pin Assignments.................................................................... 19

Appendix A: Application Considerations.................................................................. 20

Table A-1: Connections Between Two RS422 Devices......................................... 20

Figure A-1: Typical RS485 Two-Wire Multidrop Network...................................... 22

Appendix B: HVDCI D-Connector Pinout Reference................................................ 23

Table B-1: HVDCI D-Connector Pin Assignments................................................. 23

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Manual LPCI-COM-8SM

Chapter 1: Introduction

This serial interface card was designed for effective multipoint transmission in any one of three modes on
each channel. These modes are RS232, RS422 and RS485 (EIA485) protocol.
The RS485 mode may be run in three manners. It may be run as a standard RTS controlled channel, an
“Auto RTS (referred to by some as Auto RS485)” mode or as a “4 wire RS485 mode channel.

The card is 6.60 inches long and may be installed in 3.3 or 5-volt PCI-bus slots of IBM PC or compatible
computers. The card features eight independent, asynchronous serial ports, type 16788 buffered UARTs.

This series of cards are available in 4-port and RS-232 only versions.

RS422 Balanced Mode Operation

The card supports RS422 communications and uses differential balanced drivers for long range and
noise immunity. The card 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
card 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.

RS485 Balanced Mode Operation

The card supports RS485 communications and uses differential balanced drivers for long range and
noise immunity. RS485 operation involves switchable transceivers and the ability to support multiple
devices on a single "party line". The RS485 specification defines a maximum of 32 devices on a single
line. The number of devices served on a single line can be expanded by use of "repeaters".

The card also has the capability to add load resistors to terminate the communications lines. RS485
communications requires that one transmitter supply a bias voltage to ensure a known "zero" state when
all transmitters are off. Also, receiver inputs at each end of the network should be terminated to eliminate
"ringing". The card 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

Eight Type 16550 compatible UARTs incorporated within a single octal UART are used as Asynchronous
Communication Elements (ACE). These include 64-byte transmit & receive buffers 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 permits precise selection of baud rate up to
115,200 or, by changing a jumper, up to 921,600 with the standard crystal oscillator.

The driver/receiver used, the SP841 in non-RS232 modes, 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.

The driver/receiver used in RS232 mode is the SP211.

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Manual LPCI-COM-8SM

Communication Mode

The card supports Half-Duplex communications with a 2-wire cable connection. Half-Duplex allows traffic
to travel in both directions, but only one way at a time. RS485 communications commonly use the Half­Duplex mode since they share only a single pair of wires.

Baud Rate Ranges

The card has capability for two baud rate ranges and you can select which you wish to use for all ports on
the card. One range is up to 115,200 baud and the other is up to 921,600 baud.

Note

Refer to Table 5-1, Baud Rate Divisor Values in chapter 5 of the manual.

Auto-RTS Transceiver Control

In RS485 communications, the driver must be enabled and disabled as needed, allowing all cards to
share a two wire cable. The card controls the driver automatically. With automatic control, the driver is
enabled when data is ready to be transmitted.

With this card, the driver remains enabled for an adjustable period. It may be disabled at the completion
of the transmission of the character (default), or can be set to wait up to one additional character's
transmission time after data transfer is complete and then disabled.

The receiver is, therefore, normally enabled, then disabled during RS485 transmissions, and then re­enabled after transmission is completed (adjustable from zero to plus one character transmission time).
The card automatically adjusts it's timing to the baud rate of the data. (NOTE: Thanks to the automatic
control feature, the card is ideal for use in Windows applications)

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Manual LPCI-COM-8SM

Specifications

Communications Interface

• I/O Connection: 68 Pin HVDCI SCSI style -Connector

• Serial Ports: Eight cable terminated shielded male D-sub 9-pin

connectors with standard IBM AT connectors compatible

with RS485 specifications

• 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 921,600, is achieved by jumper selection on

the card. Type 16788 buffered UART.

• Address: Continuously mappable within 0000 to FFFF (hex) range

of PCI bus addresses.

• 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.

• Power Required: +5VDC at 125 mA typical total power consumption.

• Size: 6.6 inches long (167.6 mm) by 2.2 inches high (55.8 mm).

Note

The 16750 compatible UART uses 64-byte first-in-first-out buffers which are programmed through
commands sent to the FIFO control register.

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Manual LPCI-COM-8SM