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Chapter 3 Operation
The A50 (or A51) supports 5 kinds of operations. They are:
v Point-to-point/4-wire Full Duplex
v Point-to-point/2-wire Half Duplex
v Multidrop/4-wire Full Duplex
v Multidrop/2-wire Half Duplex
v Simplex/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.