Moxa Technologies A51, A60 manual Chapter Operation

The A50 (or A51) supports 5 kinds of operations. They are:

vPoint-to-point/4-wire Full Duplex

vPoint-to-point/2-wire Half Duplex

vMultidrop/4-wire Full Duplex

vMultidrop/2-wire Half Duplex

vSimplex/Transmit, Receive Only

All the operations are to be described below. And TA, TB, RA and RB represent TxD A, TxD B, RxD A and RxD B signal lines of the RJ-45 RS-422/RS-485 connector or the Terminal Block, respectively.

Note : If possible, connect GND of both sides together to gain better signals. That is, you may need one more GND connection in addition to 4-wire or 2-wire connection.

Note : For A51, connecting GND at the Terminal Block to the earth ground to provide a ground path to prevent electric shock caused by lightning, no matter RJ-45 or Terminal Block RS-422/RS-485 is used.

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