Siemens simatic ipc227e - Serial Interface

Technical specifications
7.5 Hardware descriptions
SIMATIC IPC227E
Operating Instructions, 11/2016, A5E35782395-AB
107
7.5.2.2
Serial interface
RS 232
RS 422
RS 485
Pin assignment RS232
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