Communication Ports
4.4.3 Serial RS232/RS485/RS422 RJ45 Ports
Pins 7 and 8 are connected together internally. In RS232 mode, these pins enter 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 RJ45 Ports
The RUGGEDCOM RS400 can be equipped with serial RS232/RS485/RS422 RJ45
ports. Each port can be set individually through the RUGGEDCOM RS400 operating
system to operate in RS232, RS485 or RS422 mode. For more information, refer to
the
RUGGEDCOM ROS Configuration Manual
for the RUGGEDCOM RS400.
The following is the pin-out description for the RS232/RS485/RS422 RJ45 ports:
1
8
Figure 4.10
RS232/RS485/RS422 RJ45
Serial Console Port
Name
Pin
RS232
Mode
RS485
Mode
RS422
Mode
1
RX-
2
DCD
3
4
Common (Isolated) Ground
5
RXD
RX+
6
TXD
TX/RX+
TX+
7
CTS
8
RTS
TX/RX-
TX-
Shield
Chassis Ground
No internal termination is provided.
The DSR, DCD and DTR pins are connected together internally.
In RS232 mode, the RJ45 ports conform to EIA-561 DTE, which transmit on TXD and receive on RXD.
4.4.4
Serial Insulated Terminals
The RUGGEDCOM RS400 can be equipped with serial RS485 insulated terminals. The
terminals are terminated by default from the factory. Termination provided is AC
Termination style 120 Ohm resistor in series with a 10nF capacitor. The following
details the appropriate jumper configuration for each RS485 port.
Jumper Position
Port
Jumper Number
No Termination
AC Termination
1
JP5
2
JP6
3
JP7
4
JP8
Removed
Installed
24
RUGGEDCOM RS400
Installation Manual, 01/2021, C79000-G8976-1016-11