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Communication Ports
4.4.3 Serial RS232/RS485/RS422 RJ45 Ports
b
The Common terminal is optically isolated. However, there is transient voltage protection circuitry
between the Common terminal and chassis ground.
c
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 RS401 can be equipped with serial RS232/RS485/RS422 RJ45 ports.
Each port can be set individually through the RUGGEDCOM RS401 operating sys-
tem to operate in RS232, RS485 or RS422 mode. For more information, refer to the
RUGGEDCOM ROS Configuration Manual for the RUGGEDCOM RS401.
The following is the pin-out description for the RS232/RS485/RS422 RJ45 ports:
8
Figure 4.10
a
No internal termination is provided.
b
The DSR, DCD and DTR pins are connected together internally.
c
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 RS401 can be equipped with serial RS485 insulated terminals. The
terminals are terminated by default from the factory. Termination provided is AC Ter-
mination style 120 Ohm resistor in series with a 10nF capacitor. The following details
the appropriate jumper configuration for each RS485 port.
26
1
RS232/RS485/RS422 RJ45 Ser-
ial Console Port
Port
Jumper Number
1
2
3
4
a
Pin
1
2
3
4
5
6
7
8
Shield
No Termination
JP5
JP6
Removed
JP7
JP8
Name
RS232
RS485
Mode
Mode
b
DSR
b
DCD
b
DTR
Common (Isolated) Ground
c
RXD
c
TXD
TX/RX+
CTS
RTS
TX/RX-
Chassis Ground
Jumper Position
AC Termination
Installed
RUGGEDCOM RS401
Installation Manual, 01/2020, C79000-G8976-1017-09
RS422
Mode
RX-
RX+
TX+
TX-
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