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COM1: RS-422/485
This interface is used to connect the TOUCH/PPC to the host (PLC), via an RS-
422/485 cable. When you use COM1 RS-422/485 port, you must not use COM1
RS-232C port.
Connector
Pin No
Name
Description
1
TXD+
Transmit Data +
2
TXD-
Transmit Data -
3
GND
Ground
4
RXD+
Receive Data +
5
RXD-
Receive Data -
Select RS-232C/422/485
Type
Switch
RS-232
(Default)
RS-485
RS-422
If you connect the TOUCH/PPC to the host via an RS-485 cable
(2wire), you must connect TXD+ and TXD- lines.
The RS-485 of the TOUCH/PPC runs under auto toggle mode.
To reduce the risk of damaging the RS-422 circuit, be sure to
connect the SG terminal.