Siemens SIMATIC NET RUGGEDCOM RS416 Installation Manual page 35

Communication Ports
4.3 Serial Ports
The following is the pin-out description for ST, DB9 and RJ45 serial ports:
Fiber Serial Port
1
1
2
Figure 4.7
Serial DB9 Port
Figure 4.8
a
The DSR, DCD and DTR pins are connected together internally.
b
In RS232 DCE mode, ports transmit to DTE devices on pin 2 and receive from DTE on pin 3.
c
RI is not connected.
Note
Pins 1, 4 and 6 and pins 7 and 8 are connected internally. In RS232 mode, these pins
enter a high impedance state. A DTE that asserts RTS will see CTS asserted. However,
the device will not perform hardware flow control.
26
Tx Connector
Rx Connector
ST Port
5 1
9 6
Serial DB9 Port Pin
Configuration
2
Pin
RS232 DCE
1
2
3
4
5
6
7
8
9
Shield
Mode
RS485
a
DCD
b
TX TX/RX+
b
RX
a
DTR
Common (Isolated) Ground
a
DSR
RTS TX/RX-
CTS
c
RI
Chassis Ground
RUGGEDCOM RS416
Installation Manual, 04/2021, C79000-G8976-1018-10
RS422
TX+
RX+
RX-
TX-