Siemens SIMATIC IPC277E

Technical specifications
8.5 Hardware description
SIMATIC IPC277E
Operating Instructions, 11/2019, A5E35783335-AE
115
8.5.2.2 Serial interface
RS232
RS422
RS485
RS-232 assignment
Pin
Short description
Meaning
1
DCD
Data carrier detect (I)
2
RxD
Received data (I)
3
TxD
Transmitted data (O)
4
DTR
Data terminal ready (O)
5 M Ground
6
DSR
Data set ready (I)
7
RTS
Request to send (O)
8
CTS
Clear to send (I)
9
RI
Incoming call (I)
Pin assignment RS422
Pin
Short description
Meaning
1
TX-
Transmit data - (O) for full-duplex mode
2
TX+
Transmit data + (O) for full-duplex mode
3
RX+
Receive data + (I) for full-duplex mode
4
RX-
Receive data - (I) for full-duplex mode
5
M
Signal ground
6
nc
7
nc
8
nc
9
nc