Serial Rs232/Rs485/Rs422 Db9 Ports - Siemens SIMATIC NET RUGGEDCOM RS400 Installation Manual

communicating with an another DCE device, such as another RUGGEDCOM RS400,
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 RS400 can be equipped with serial RS232/RS485/RS422 DB9 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 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.
RUGGEDCOM RS400
Installation Manual, 01/2021, C79000-G8976-1016-11
5 1
9 6
RS232 DB9 Serial Console
Port
5 1
9 6
RS232/RS485/RS422 DB9
Serial Console Port
Communication Ports
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 Chassis Ground
Description
Transmit Data
Receive Data
Common Ground
Name
RS485 RS422
Mode Mode
— —
TX/RX+ TX+
— RX+
— —
b
— RX-
TX/RX- TX-
— —
— —
23