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Chapter 3 l l Operation
12
3.1 Point-to-point
Point-to-point configuration means two devices which locate at
two different places can be linked together to communicate
through a couple of A50 (or A51) converters.
4-wire Full 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
Full-duplex mode Off TxD always enabled On Off X X
RxD always enabled X X On Off
A50/A51A50/A51
RS-232
RA
RB RS-422/ RS-232
TB RS-485
TA
GND
TA
RS-422/ TB
RS-485 RB
RA
GND
DTE/
DCE
DTE/
DCE