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 - -
4 Common (Isolated Ground)
5 RX - RX+
6 TX 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. In
RS232 mode, these pins enter a high impedance state. A DTE that asserts DTR and
expects DSR or CD will operate correctly. A DTE that asserts RTS will see CTS
asserted, although the RuggedServer will not perform hardware flow control.
3. The Common terminals are optically isolated; however, there is transient voltage
protection circuitry between the Common terminals and chassis ground.
2010 RuggedCom Inc. 30 Rev107
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