Serial Interface - Siemens SIMATIC IPC277E Operating Instructions Manual

8.5.2.2

Serial interface

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