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
Figure 16: DB9 Female DCE Port |
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Pin | RS232 Mode |
| RS485 Mode |
| RS422 Mode |
1 | CD |
| - |
| - |
2 | TX |
| TX/RX+ |
| TX+ |
3 | RX |
| - |
| RX+ |
4 | DTR |
| - |
| - |
5 |
| Common (Isolated Ground) |
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6 | DSR |
| - |
| RX- |
7 | CTS |
| TX/RX - |
| TX- |
8 | RTS |
| - |
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| RI |
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9 | (No Connection) |
| - |
| - |
Shield |
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| Chassis Ground |
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Table 5: DB9 Female DCE Port |
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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.
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2008 RuggedCom Inc. All rights reserved | Rev104 |