User`s guide

Introduction
OMG-ISO-COMM Page 1
Introduction
Overview
The OMG-ISO-COMM provides the PC with additional ground isolated serial
ports for terminals, modems, printers, etc. Isolation is important in installations
where the equipment being connected to the PC is either far from the PC, or on a
different power transformer circuit. Ground loop current is a commonly neglected
and misunderstood phenomena that leads to the failure (and destruction) of
communication interfaces. The OMG-ISO-COMM isolated boards provide up to
500 volts DC of isolation.
The OMG-ISO-COMM provides two or four DOS and Windows compatible
serial ports, and also offers extended ‘AT’ interrupts. Each port is independently
addressable as COM1: through COM4:, or any other I/O address up to 3FF Hex.
What’s Included
The OMG-ISO-COMM is shipped with the following items. If any of these items
are missing or damaged, contact the supplier.
• OMG-ISO-COMM Serial I/O Adapter
• Cable providing 2 DB-9 connectors.
• Software
Factory Default Settings
The OMG-ISO-COMM factory default settings are as follows:
Port # Base Address IRQ
Port 1 3F8 4
Port 2 2F8 3
Port 3 3E8 4
Port 4 2E8 3
For your reference, record installed OMG-ISO-COMM settings below:
Port # Base Address IRQ
Port 1
Port 2
Port 3
Port 4