RuggedCom RS900 用户手册

RS900 Family Installation Guide

4.2 RJ45 Serial Port

The RJ45 Serial port is selectable via software to be RS232, RS485 or RS422.

Figure 16: RJ45 Port pin-out

Pin

RS232 Mode

RS485 Mode

RS422 Mode

1 DSR - RX-
2 DCD -

3 DTR -

Common (Isolated Ground)

5 RX - RX+
6

TX/RX +

TX +

7 CTS - -
8

RTS

TX/RX -

TX -

Shield Chassis

Ground

Table 10: RJ45 Port pin-out

NOTES:
1. No internal termination is provided.

2. Pins 1, 2, and 3 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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