Siemens SIMATIC IOT Operating Instructions Manual page 117

Assignment RS 232
Pin
1
2
3
4
5
6
7
8
9
Assignment RS 422
Pin
1
2
3
4
5
6
7
8
9
Assignment RS 485
Pin
1
2
3
4
5
6
7
8
9
SIMATIC IOT2050
Operating Instructions, 03/2024, A5E39456816-AF
Short description
DCD
RxD
TxD
DTR
M
DSR
RTS
CTS
RI
Short description
TX-
TX+
RX+
RX-
M
nc
nc
nc
nc
Short description
Data-
Data+
nc
nc
M
nc
nc
nc
nc
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
Transmitted data - (O) for full-duplex mode
Transmitted data + (O) for full-duplex mode
Receive data + (I) for full-duplex mode
Receive data - (I) for full-duplex mode
Signal ground
Meaning
Transmit / receive data - (I/O) for half-duplex mode
Transmit / receive data+ (I/O) for half-duplex mode
Signal ground
Hardware descriptions
10.4 External Interfaces
117