Festo CPX Series Manual page 23

3.5 Pin allocation of the RS232 interface
(CPX-CEC-S1-V3)
Socket
Festo CPX-CEC-Z6 1407b English
Pin Signal
1 n.c.
2 RxD
3 TxD
4 n.c.
5 GND
6 n.c.
7 n.c.
8 n.c.
9 n.c.
Screened Screened
Explanation
Not connected
Received data
Transmitted data
Not connected
Data reference potential
Not connected
Not connected
Not connected
Not connected
Connection to functional
earth
23