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2008 RuggedCom Inc. All rights reserved Rev104
4.6.2 RS232/RS485/RS422 via DB9
Each port is individually selectable via software to be RS232, RS485 or RS422. The DB9 port and
pin-out is shown below.
Figure 16: DB9 Female DCE Port pin-out
Pin RS232 Mode RS485 Mode RS422 Mode
1 CD - -
2 TX TX/RX+ TX+
3 RX
-
RX+
4 DTR - -
5 Common (Isolated Ground)
6 DSR - RX-
7 CTS TX/RX - TX-
8 RTS -
9
RI
(No Connection) - -
Shield Chassis Ground
Table 5: DB9 Female DCE Port pin-out
NOTES:
1. No internal termination is provided.
2. Pins 1, 4, and 6 are connected internally. Pins 7 and 8 are connected internally. The pins are
permanently asserted to 5V so that DTE devices that require DCD, DTR, or CTS signals will
operate. However, hardware flow control via RTS is not recognized.
3. The Common terminals are optically isolated; however, there is transient voltage protection
circuitry between the Common terminals and chassis ground.