RuggedCom RS900 Manuel D’Utilisation

RS900 Family Installation Guide

4 Serial Ports

Serial ports can be either DB9 Serial ports, RJ45 serial ports or Fiber Serial ports

4.1 DB9 Serial Port

The DB9 port is selectable via software to be RS232, RS485 or RS422.

Figure 15: DB9 Female DCE Port pin-out

Pin

RS232 Mode

RS485 Mode

RS422 Mode

1 DCD

2 TX TX/RX+ TX+
3 RX

RX+

4 DTR

Common (Isolated Ground)

6 DSR

RX-

7 CTS TX/RX

- TX-

8 RTS

RI (No Connection)

Shield Chassis

Ground

Table 9: 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.

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