Multitech ISI551PC User manual

Intelligent Serial Interface (ISI)
Model ISI551PC Card
Owner's Manual
Multi
Tech

S
y
stems

82031702

NOTE: This equipment has been tested and found to comply
with the limits for a Class B digital device, pursuant to Part 15 of
the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is
operated in a residential installation. This equipment generates,
uses and can radiate radio frequency energy, and if not installed
and used in accordance with the instruction manual, may cause
harmful interference to radio communications. However, there is
no guarantee that interference will not occur in a particular
installation. If this equipment cause harmful interference to radio
or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different
from that of which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for
help.
WARNING: Changes or modifications to this unit not expressly
approved by the party responsible for compliance could void the
users authority to operate this equipment.
This device complies with Part 15 of the FCC rules. Operation is
subject to the following conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any
interference received, including interference that may cause
undesired operation.

Owner's Manual
P/N 82031702, Rev. C
ISI551PC
This publication may not be reproduced, in whole or in part, without
prior expressed written permission from Multi-Tech Systems, Inc.. All
rights reserved.
Copyright © 1995, by Multi-Tech Systems, Inc.
Multi-Tech Systems, Inc., makes no representation or warranties with
respect to the contents hereof and specifically disclaims any implied
warranties of merchantability or fitness for any particular purpose.
Furthermore, Multi-Tech Systems, Inc., reserves the right to revise
this publication and to make changes from time to time in the content
hereof without obligation of Multi-Tech Systems, Inc., to notify any
person or organization of such revisions or changes.
Record of Revision
C Manual revised with format and editorial
(2/6/95) changes
TRADEMARKS
Multi - Tech, MultiExpress, MultiModemII and the Multi - Tech logo:
Multi - Tech Systems, Inc.
i386, i486: Intel Corporation
PC-DOS: International Business Machines Corporation
Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, Minnesota 55112 U.S.A.
[phone] or [phone]
U. S. FAX [phone]
Technical Support [phone]
BBS [phone] or [phone]
Internet Address: http://www.multitech.com

i
TABLE OF CONTENTS
CHAPTER 1
INTRODUCTION & DESCRIPTION
1.1 Introduction ........................................... 1-1
1.2 Product Description .............................. 1-2
1.3 How to Use This Manual ......................1-2
1.4 Technical Specifications ......................1-3
CHAPTER 2
HARDWARE INSTALLATION
2.1 ISI Card Installation .............................. 2-1
2.2 Determining Current System Settings . 2-1
2.3 Hardware Installation Procedure .......... 2-3
CHAPTER 3
SERVICE, WARRANTY, AND TECHNICAL
SUPPORT
3.1 Introduction ........................................... 3-1
3.2 Limited Warranty .................................. 3-1
3.3 Tech Support ........................................3-2
3.3.1 Recording ISI551PC Information 3-3
3.3.2 Service ........................................ 3-4
3.4 About the Multi-Tech BBS .................... 3-5
3.4.1 How to Use the Multi-Tech BBS . 3-6
3.5 About CompuServe/Internet ................ 3-7
Appendix A:
I/O Address Switch Settings A-1

1-1
1.1 Introduction
The introduction of high speed, data compression
modems, such as Multi-Tech's MultiModemII TM
Series, has shown that many PC serial ports are
unable to keep up, essentially becoming a bottleneck
for the entire system. The ISI551PC card provides
processing power to reliably transmit data up to
115.2K bps. Using an ISI enables your system's
processortoperform moreefficiently.This isbecause
the ISI handles all of the byte-by-byte interrupts
generated by the asynchronous terminals and stores
the data in buffers. The ISI then generates one
interrupt for an entire block of information and
transfers the block to the system's microprocessor.
This manual provides the hardware installation
procedures for the ISI551PC card. The ISI551PC
card is used with Multi-Tech's high speed modems;
and is a high speed, buffered, single-port serial card,
with its own on board processor. The operation of
thecardprovides thebasis for itsname ISI(Intelligent
SerialInterface),551 indicatingtheprocessing power
of a 16550A UART and one port support, and PC
indicating that it is an ISA bus card (8 bit), which is
abletooperate in any286,386, 486 orPentium ISA or
EISA compatible bus personal computer. The
ISI551PC card can be accessed by any software
written to the 16550A specification.

1-2
This manual contains product specifications,
installation instructions, configuration and technical
support information which will assist you in the
operation process. It is assumed that you have basic
PC skills at the very least. Therefore, we have not
included step-by-step instructions for basic
operations such as logging in and file editing, etc.
1.2 Product Description
The ISI551PC card is a single port serial expansion
card which adds data buffering for enhanced serial
port performance. The ISI551PC features a 9 - pin
connector (one DB-9), and is a "half-size" expansion
card that supports a high-speed interface (up to
115.2K bps via 32K bytes of RAM). The ISI551PC
features a bank of 8 DIP-Switches for I/O address
selectionandone jumperblock for IRQlevel selection.
1.3 How to Use This Manual
Thischapterbegins with ashort introduction, product
description, followed by a guide (which you are now
reading) to the use of this manual, as well as the
ISI551PCs technical specifications.

1-3
This manual includes hardware configuration and
installation procedures described in Chapter 2.
Chapter 3 covers technical support, warranty and
BBS information. Appendix A describes complete
information on Base I/O addressing.
1.4 Technical Specifications
Computer Requirements
· 286-, 386- or 486- based PC or compatible
Operating Temperature
· 0° to 50°C (32° to 120°F)
Serial Interface
· RS232C, RS232D
Bus Type
· IBM PC standard (ISA bus) or EISA
Power Consumption
· 750 mAmps @ +5 VDC
· 100 mAmps @ +12 VDC
· 100 mAmps @ -12 VDC

1-4
Card Dimensions
ISI551PC
· 4.95" L x 2.375" W x .062" D
· 12.5 cm L x 6.0 cm W x .16 cm D
Baud Rates
· Up to 115.2K bps
Connector Types
· One DB-9 on ISI551PC
I/O Address
· Set by hardware DIP-Switch, valid range 100H to
3F8H (See Appendix A)
InterruptRequest
· Set by hardware Jumper, valid IRQs -- 2, 3, 4, 5,
7, 10, 11, 12, & 15

2 - 1
2.1 ISI Card Installation
This chapter provides you with the procedures to
install the Multi-Tech ISI551PC card in your ISA or
EISA bus personal computer.
Hardware installation involves:
1) Opening your PC.
2) Setting card configuration (determining
I/O address DIP-Switch setting and IRQ
jumper setting).
3) Installing the card into the PC.
2.2 Determining Current System
Settings
When you install a serial device into your computer,
the processor must have a means of routing
information to and from the device and the device
must have a means of gaining the processor's
attention. These are called Input/Output (I/O)
addresses and Interrupt Requests (IRQs),
respectively. The ISI551PC card requires eight I/O
addresses and one IRQ value which are not used
by any other device in your system. When selecting
a unique base I/O address, be sure that the other
addresses are also unused. (For example, if you