User Guide

Operation l l Chapter 3
17
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
3.3 Simplex/Transmit, Receive
Simplex configuration means that more than two devices
(Max. 10 for RS-422; Max. 32 for RS-485) can be linked all
together to communicate through many A50/A51 devices. Its
configuration is like the Multidrop's, but the master device can
talk only and the slave devices can listen only.