Introduction; Informing The Pc Of The Port Address - Brainboxes RS422 Manual

AT & OPTO DUAL RS422/485
AT DUAL RS422/485
SOFTWARE CONFIGURATION

Introduction

This section contains the installation procedures for the AT
Dual RS422/485 and AT Opto Dual RS422/485 cards, for the
operating systems DOS, Windows 3.x, Windows 95, Windows NT,
OS/2 version 2.x and OS/2 Warp
In each section, as an example, the AT Dual RS422/485
with its factory default address selection has been used in the listed
setup procedure. The IRQ selections have been changed for
indication only. You should change to these settings ONLY if your
PC configuration allows this, refer to previous chapters for details
on changing these settings. The setup procedures in this chapter
also assume that your PC has only one serial port present. For more
information on configuring AT Dual RS422/485 refer to Chapters 2
"AT Dual RS422/485 Hardware Installation Guide". If you
have changed the default settings of the cards in any way, then
substitute the appropriate values in the relevant sections.

Informing The PC Of The Port Address.

The BIOS of most new PC's automatically detects whether
serial ports COM1 - COM4 addresses are present in a machine.
Other, older PC's are capable of detecting serial ports COM1 -
COM2, but the problem comes with serial ports COM3 and
COM4. PC's have a table of information that stores the setup of the
PC, this is the BIOS data area. It has space for 4 serial port
addresses. The trick, for the older PC's, is to get the right
addresses into the third and fourth port areas. However, PC's are
not capable of recognising ports above COM4 - specific device
CHAPTER 4
Software Configuration
Chapter 4 Page 33