Communication Ports
4.3 Serial Ports
The following is the pin-out description for ST, DB9 and RJ45 serial ports:
Fiber Serial Port
2
1
1
Tx Connector
2
Rx Connector
Figure 4.7
ST Port
Serial DB9 Port
6
9
5
1
Figure 4.8
Serial DB9 Port Pin
Configuration
Mode
Pin
RS232 DCE
RS485
RS422
1
2
TX/RX+
TX+
3
RX+
4
5
Common (Isolated) Ground
6
RX-
7
RTS
TX/RX-
TX-
8
CTS
9
Shield
Chassis Ground
The DSR, DCD and DTR pins are connected together internally.
In RS232 DCE mode, ports transmit to DTE devices on pin 2 and receive from DTE on pin 3.
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.
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RUGGEDCOM RS416F
Installation Manual, 04/2021, C79000-G8976-1354-04