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Operation l l Chapter 3
13
2-wire Half Duplex
In the graph, TA, TB, RA and RB could be either from RJ-45 or
Terminal Block. The settings of the switches for each A50 (or
A51) are as follows:
SW1 SW2 Pin1 Pin2 Pin3 Pin4
Half-duplex mode On TxD enabled by RTS Off On X X
RxD enabled by / RTS X X Off On
A50/A51
RA
RB RS-232
TB
TA
GND
DTE/
DCE
A50/A51
RS-232
TA
TB
RB
RA
GND
DTE/
DCE
RS-485
RS-485