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What is RS422?

April 26, 2017rs422

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What is RS422?

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RS530, RS449, RS422 / 422A – RS530, RS449, RS422 and RS422A are signaling specifications published by the Electronic Industries Association (EIA). RS422 defines electrical signaling characteristics. It references a companion standard RS449 that defines signal functions placed on a 37-pin (DB37) mechanical connector with specific pin assignments. Because of the cost of the DB37 connectors, manufacturers generally ignored that portion of the specification and placed a subset of the RS449 signals on a 25-pin (DB25) connector. The EIA subsequently legitimized this practice by publishing RS422A / RS530. As a practical matter, RS530 is simply ‘RS449 on DB25.