As you know that the RS-422 can drive as many as 10 receivers, so you can use the ADAM-4520 for the RS-422 network application. You have to setting the individual ID for those RE-422 devices. Following information just for your reference.
ADAM-4520 ID#1 ID#2 ID#3 ID#4 ID#5
Tx+ - - - - - Rx+ - - - - - Rx+ - - - - - Rx+ - - - - - Rx+ - - - - - Rx+
Tx- - - - - - Rx- - - - - - Rx- - - - - - Rx- - - - - - Rx- - - - - - Rx-
Rx+ - - - - - Tx+ - - - - - Tx+ - - - - - Tx+ - - - - - Tx+ - - - - - Tx+
Rx- - - - - - Tx- - - - - - Tx- - - - - - Tx- - - - - - Tx- - - - - - Tx-
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