20 CP620, CP630, CP635, CP651, CP661, CP665, CP676
Serial Port
The serial port is used to communicate with the PLC or with another type of controller.
Different electrical standards are available for the signals in the PLC port connector: RS-232, RS-422,
RS-485.
NOTE
It is always necessary to use the correct cable type to connect on the PLC.
If the proper cable is not used, communication with the PLC will not be possible.
The serial port is software programmable. Make sure you select the appropriate interface in the pro-
gramming software.
Serial port.
RS-232 RS-422, RS-485
Pin Description Pin Description
1 GND 1 GND
2 2
3 TX 3 CHA-
4 RX 4 CHB-
5 5
6 +5 V output 6 +5 V output
7 CTS 7 CHB+
8 RTS 8 CHA+
9 9
The communication cable must be chosen for the type of device being connected.
Ethernet Port
The Ethernet port has two status indicators.
Ethernet Port
A OFF: Valid link has not been detected
ON: Valid link has been detected
B ON: No activity
OFF: Activity
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