4.4.3 Serial Rs232/Rs485/Rs422 Fiber Ports; Connecting Multiple Rs485 Devices - Siemens SIMATIC NET RUGGEDCOM RS910W Installation Manual

system to operate in RS232, RS485 or RS422 mode. For more information, refer to
the RUGGEDCOM ROS Configuration Manual for the RUGGEDCOM RS910W.
The following is the pin-out description for the RS232/RS485/RS422 RJ45 ports:
8
Figure 4.9
a
No internal termination is provided.
b
Connected internally.
c
Connected internally.
d
In RS232 mode, this pin enters a high impedance state. A DTE that asserts RTS will see CTS asserted,
although the device will not perform hardware flow control.
4.4.3 Serial RS232/RS485/RS422 Fiber Ports
The RS910W can be equipped with serial RS232/RS485/RS422 fiber ports. Each
port can be set individually through the RUGGEDCOM RS910W operating system
to operate in RS232, RS485 or RS422 mode. For more information, refer to the
RUGGEDCOM ROS Configuration Manual for the RS910W.
The following is the pin-out description for the RS232/RS485/RS422 fiber ports:
1
Figure 4.10
4.4.4

Connecting Multiple RS485 Devices

Each RS485 port can communicate with multiple RS485 devices by wiring devices
together in sequence over a single twisted pair with transmit and receive signals on
RUGGEDCOM RS910W
Installation Manual, 04/2021, C79000-G8976-1031-12
1
RS232/RS485/RS422 RJ45
Serial Console Port
2
RS232/RS485/RS422 Fiber
Serial Console Ports
4.4.3 Serial RS232/RS485/RS422 Fiber Ports
a
Pin
RS232
Mode
b
1 DSR/RI
b
2 DCD
c
3 DTR
4 Common (Isolated) Ground
5 RX
6 TX
c d
7 CTS
c d
8 RTS
Shield
Pin
1
2
Communication Ports
Name
RS485 RS422
Mode Mode
RX-
RX+
TX/RX+ TX+
TX/RX- TX-
Chassis Ground
Name
Rx
Tx
29