Chapter 3
Communication Ports
RUGGEDCOM RS416
Installation Guide
22
Serial Ports
Fiber Serial Port
2
1
Figure 24: ST Port
1.
Tx Connector
2.
Rx Connector
Serial DB9 Port
6
9
5
1
Figure 25: Serial DB9 Port Pin Configuration
Mode
Pin
RS232 DCE
RS485
RS422
1
DCD
a
2
TX
b
TX/RX+
TX+
3
RX
b
RX+
4
DTR
a
5
Common (Isolated) Ground
6
DSR
a
RX-
7
RTS
TX/RX-
TX-
8
CTS
9
RI
c
Shield
Chassis Ground
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.
