User guide

Serial Ports
27
RuggedCom
®
RuggedServer™ RS416 Family Installation Guide rev118
3.4 RS232/RS485/RS422 via RJ45
Each port is individually selectable via software to be RS232 (EIA-561 DTE), RS485 or
RS422. The RJ45 port and pin-out is shown below.
Figure 21: RJ45 port pin-out
Pin RS232 Mode RS485 Mode RS422 Mode
1 DSR
2
- RX-
2 DCD
2
- -
3 DTR
2
- -
4 Common (Isolated) Ground
5 RXD
3
- RX+
6 TXD
3
TX/RX + TX +
7 CTS
2
- -
8 RTS
2
TX/RX - TX -
Shield Chassis Ground
Table 8: 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 DCD will operate
correctly. A DTE that asserts RTS will see CTS asserted, although the RuggedServer will not perform
hardware flow control.
3. In RS232 mode, the RJ45 ports conform to EIA-561 DTE, which transmit on TXD and receive on RXD.