Siemens SIMATIC IPC427E - 8.6 Hardware Descriptions

Technical specifications
8.6 Hardware descriptions
SIMATIC IPC427E
112 Operating Instructions, 09/2017, A5E37454814-AB
8.6
Hardware descriptions
8.6.1
External ports
8.6.1.1
COM1 / COM2
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