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40 RS-422/485 Application Note

 Copyright B&B Electronics -- Revised October 1997

B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350

PH (815) 433-5100 -- FAX (815) 434-7094

Appendix B: EIA Standard RS-423 Data Transmission

RS-423 (EIA-423) is another standard used in point to point

communications. RS-423 data transmission uses an unbalanced line driver

that connects to an RS-422 type balanced line receiver as shown in Figure B.1.

The RS-423 line driver is unique to this system. It produces voltage similar to

RS-232 but has a slew rate control input that is used to limit rise times and

cross talk on the data lines. Typical adjustment on the slew rate control is

from 1 to 100 µs. This is done by the proper selection of one resistor on the

wave shape control input.

Figure B.1

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