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Browse Prior Art Database

8-Port EIA-232C to EIA-422A Conversion Adapter

IP.com Disclosure Number: IPCOM000101726D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 3 page(s) / 92K

Publishing Venue

IBM

Related People

Cabezas, R: AUTHOR [+3]

Abstract

Disclosed is a communications conversion adapter that will allow eight EIA-232C (1) devices to interface with eight EIA-422A (2) devices. The conversion adapter is capable of transmitting and/or receiving up to eight ports simultaneously.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

8-Port EIA-232C to EIA-422A Conversion Adapter

       Disclosed is a communications conversion adapter that
will allow eight EIA-232C (1) devices to interface with eight
EIA-422A (2) devices.  The conversion adapter is capable of
transmitting and/or receiving up to eight ports simultaneously.

      EIA-232C devices do not directly attach to EIA-422A devices.
This conversion adapter provides the signal conversion necessary for
the two EIA standards to communicate to each other.  Errors can be
injected (see Table #1) in as many of the eight ports as needed,
having no effect on the other ports.  Errors are injected via Dual
In-Line Package (DIP) switches.

      The conversion adapter supports transmit, receive and ground
signals only (see Fig. 1).   All other signals must be handled by the
transmit/receive device.  The conversion adapter is a PS/2* form
factor adapter (see Fig. 2).  It uses the IBM Low End Parallel Bus to
obtain its ground signals and power.

      The conversion adapter is very helpful when monitoring and
injecting faults in communication adapters or/and networks.  The
conversion adapter meets the EIA standards 232C and 422A for the
signals it supports.
*  Trademark of IBM Corp.

      References
(1) Electronic Industries Association, "EIA-232C".
(2) Electronic Industries Association, "EIA-422A".