Serial Interface - Siemens simatic ipc227e Operating Instructions Manual

7.5.2.2

Serial interface

Pin assignment RS232
Pin
1
2
3
4
5
6
7
8
9
Pin assignment RS422
Pin
1
2
3
4
5
6
7
8
9
SIMATIC IPC227E
Operating Instructions, 11/2016, A5E35782395-AB
Short description
DCD
RxD
TxD
DTR
M
DSR
RTS
CTS
RI
Short description
TX-
TX+
RX+
RX-
M
nc
nc
nc
nc
RS 232
RS 422
RS 485
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
7.5 Hardware descriptions
107