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communicating with an another DCE device, such as another RUGGEDCOM RS401,
the RX and TX pins must be crossed-over using, for example, a NULL modem cable.
The following is the pin-out description for the RS232 DB9 ports:
Figure 4.8
4.4.2
Serial RS232/RS485/RS422 DB9 Ports
The RUGGEDCOM RS401 can be equipped with serial RS232/RS485/RS422 DB9 ports.
Each port can be set individually through the RUGGEDCOM RS401 operating system
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 DB9 ports:
Figure 4.9
a
No internal termination is provided.
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.
RUGGEDCOM RS401
Installation Manual, 11/2022, C79000-G8976-1017-12
5
1
9
6
RS232 DB9 Serial Console Port
5
1
9
6
RS232/RS485/RS422 DB9 Serial
Console Port
4.4.2 Serial RS232/RS485/RS422 DB9 Ports
Pin
Name
1
Reserved (Do Not Connect)
2
TX
3
RX
4
Reserved (Do Not Connect)
5
GND
6
Reserved (Do Not Connect)
7
Reserved (Do Not Connect)
8
Reserved (Do Not Connect)
9
Reserved (Do Not Connect)
a
Pin
RS232
Mode
1
CD (No
Connection)
2
TX
3
RX
4
DTR (No
Connection)
5
Common (Isolated Ground)
6
DSR (No
Connection)
c
7
CTS
c
8
RTS
9
RI (No
Connection)
Shield
Communication Ports
Description
Transmit Data
Receive Data
Common Ground
Name
RS485
RS422
Mode
Mode
—
—
TX/RX+
TX+
—
RX+
—
—
b
—
RX-
TX/RX-
TX-
—
—
—
—
Chassis Ground
25
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