Siemens RUGGEDCOM RS416P Installation Manual page 28

Chapter 3
Communication Ports
Fiber Serial Port
Figure 24: ST Port
1. Tx Connector 2. Rx Connector
Serial DB9 Port
Figure 25: Serial DB9 Port Pin Configuration
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.
22
1
5 1
9 6
2
Pin
RS232 DCE
a
1 DCD
b
2 TX
b
3 RX
a
4 DTR
5 Common (Isolated) Ground
a
6 DSR
7 RTS
8 CTS
c
9 RI
Shield Chassis Ground
RUGGEDCOM RS416P
Installation Guide
Mode
RS485 RS422
TX/RX+ TX+
RX+
RX-
TX/RX- TX-
Serial Ports