Rs232/rs485/rs422 via db9, Figure 19: db9 female port pin-out, Table 6: db9 female dce port pin-out – RuggedCom RS416 User Manual
Page 25
Serial Ports
25
RuggedCom
®
RuggedServer™ RS416 Family Installation Guide rev118
3.2 RS232/RS485/RS422 via DB9
Each port is individually selectable via software to be RS232, RS485 or RS422. The
DB9 port pin-out diagram and listing are shown below.
Figure 19: DB9 female port pin-out
Pin
RS232 DCE Mode
RS485 Mode
RS422 Mode
1
DCD
2
-
-
2
TX
4
TX/RX+
TX+
3
RX
4
-
RX+
4
DTR
2
-
-
5
Common (Isolated) Ground
6
DSR
2
-
RX-
7
RTS
2
TX/RX-
TX-
8
CTS
2
-
-
9
RI
3
-
-
Shield
Chassis Ground
Table 6: DB9 Female DCE Port pin-out
NOTES:
1. No internal termination is provided.
2. In RS232 mode, pins 1, 4, and 6 are connected internally, and pins 7 and 8 are connected internally.
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. RI is not connected
4. In RS232 DCE mode, ports transmit to DTE devices on pin 2 and receive from DTE on pin 3.