Technical specifications
6.4 External interfaces
SIMATIC ITP1000
80
Operating Instructions, 05/2017, A5E37340160-AB
6.4.4
RS232 (COM1)
Pin no.
Short description
Meaning
Input / output
1
DCD
Data carrier detect
Input
2
RxD
Received data
Input
3
TxD
Transmit data
Output
4
DTR
Data terminal ready
Output
5
GND
Ground
-
6
DSR
Ready for operation
Input
7
RTS
Request to send
Output
8
CTS
Clear to send
Input
9
RI
Incoming call
Input