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$315.00 (USA and Canada only)

Availability: In stock
ISA Bus Serial Port RS422/485, Isolated

Production Specification

ISA Bus Serial Port RS422/485, Isolated


Power Requirements

250 mA at 5 VDC
150 mA at 12 VDC
150 mA at -12 VDC

Operating Temperature Range

0 °C to 60 °C
95% relative humidity, non-condensing


4,000 VAC


RS-422/485 (9-pin, D-shell female connector)

Baud Rate

up to 38,400 baud


up to 5,000 feet


full duplex over two twisted pairs and a ground
additional twisted pairs for RTS and CTS


transmit, receive, RTS, and CTS


PC-Based I/O Overview

This document shows examples of system architecture for PC-based I/O control systems and lists Opto 22 products that work together for PC-based control. System examples include:

  • Ethernet systems using SoftPAC, a software-based programmable automation controller programmed with PAC Control
  • Ethernet systems using the OptoMMP protocol
  • Direct control of I/O using no I/O processor (no brain)
  • Serial control using a brain and the mistic or Optomux protocol
  • High-speed control using the Pamux protocol

ISA Bus RS-422/485 (with Isolation) Adapter Card Data Sheet

The AC24AT is an RS-422/485 adapter card that plugs directly into the IBM PC bus and provides up to 4,000 VAC isolation between the PC bus and the communications link.

AC24AT_AC422AT Users Guide

The AC24AT and AC422AT cards provide an asynchronous RS-422/485 communications port for the ISA bus. The adapter cards are seen by the computer as standard COM ports.

Declaration of Conformity (EMC, RoHS)

This document is the Manufacturer's Declaration of Conformity for the products listed herein, in accordance with European, international, and/or national standards and regulations.

Opto 22 RoHS 3 Statement of Compliance - Restriction of Hazardous Substances

This document is a statement of compliance with the EU Directive 2015/863/EU, Restriction of Hazardous Substances (RoHS 3). This document lists Opto 22 products that comply with the substance restrictions of the RoHS 3 directive.

CE Declaration: Component

This document is the Manufacturer's Declaration for the listed products as mentioned in the attachment - to which this confirmation refers - that they are in accordance with the mentioned European, international and/or national standards and regulations.

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