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What is the difference between RS485 and RS422?

April 26, 2017difference rs422 RS485

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What is the difference between RS485 and RS422?

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RS422 and RS485 are both balanced (differential) interfaces. The major differences lie in the load that may be driven and the common mode voltage tolerated. RS422 will drive a maximum of ten devices RS485 will drive 32 devices. The “common mode” voltage tolerated by RS422 is ±7Vdc and for RS485 common mode voltage tolerated is +12 to -7Vdc. Common mode voltage is defined as the mean voltage of terminals A and B with respect to signal ground.