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Availability: Obsolete
OBSOLETE - Addressable RS232 Interface 120 VAC

Production Specification

 "*** NOTE: This part is obsolete and no longer available. *** 
Please contact Opto 22 Pre-Sales engineers for more information.
Addressable RS232 Interface 120 VAC

AC31A, AC31B, and AC31C

Power Requirements


115 VAC ± 10 VAC @ 60 Hz
220 VAC ± 20 VAC @ 50 Hz
10 - 28 VDC; 10 VDC @ 0.75 amps,
24 VDC @ 0.25 amps

Power Dissipation

Less than 4 watts @ 25 °C

Temperature Range

0 to 70 °C
0 to 95% Humidity (non-condensing)

Interface Slave

Full duplex selectable RS232 & RS485/422
serial port

Interface Host

Full duplex RS-485/422 serial port

Baud Rate

300, 1200, 2400, 4800, 9600, 19200,
and 38400 baud


64,180 8-bit microprocessor

CPU Clock Frequency

6.144 MHz


32K bytes


32K bytes


Transmit, receive, and power

Jumper Selectable


Address (0 to 255)
Baud rates
Terminating and biasing resistors


Addressable RS232-RS485 Interface Data Sheet

*** NOTE: AC31A, AC31B and AC31C are obsolete and no longer available. *** 
Please contact Opto 22 Pre-Sales engineers to discuss options for your specific application.

The AC31 adapter card is a general purpose addressable interface that allows any slave serial device that uses asynchronous serial communications (terminals, printers, barcode readers, etc.) to be addressed and attached to a multidrop network.

AC31 Users Guide

The AC31 is an addressable interface for the OPTOMUX bus. Many devices incompatible with the OPTOMUX bus protocol can be made compatible by using an AC31.

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