SST Automation GT200-HT-RS, User Manual

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②
Each subsection can be connected up to 32 sites;
③
The farthest two end of the bus has a terminal resistor—120Ω 1/2W to ensure reliable operation of the
network.
Serial interface uses 5-pin pluggable open terminal and user can wire it according to the wiring instructions
on the panel.
5-pin terminal:
GND
D-
D+
1
2
3
4
5
R-
R+
Pin Function
1 R-, RS-422 Receive Negative
2 R+, RS-422 Receive Positive
3 GND
4 D-, RS-485/RS-422 Transmit Negative
5 D+, RS-485/RS-422Transmit Positive
3.4.3 RS-232 Interface
RS-232 interface uses one 3-pin pluggable open terminal, and its pin description is shown as follows:
RX
TX
GND
1
2
3