Pin-outs 149
Modem Cable 9-pin to RS-232 25-pin
RJ-45 Pin
Assignments
Pin assignments are identical for 10BASE-T and 100BASE-TX RJ-45
connectors.
Table 13 Pin Assignments
Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR
Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR
Shell
3
2
7
8
6
5
1
4
1
2
3
4
5
6
7
8
20
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Cable connector: 9-pin female
RS-232 Modem Port
Cable connector: 25-pin male
Pin Number Signal Function
Ports configured as MDI
1 Transmit Data + Bidirectional Data A+
2 Transmit Data + Bidirectional Data A-
3 Receive Data + Bidirectional Data B+
4 Not assigned Bidirectional Data C+
5 Not assigned Bidirectional Data C-
6 Receive Data – Bidirectional Data B-
7 Not assigned Bidirectional Data D+
8 Not assigned Bidirectional Data D-
Ports configured as MDIX
1 Receive Data + Bidirectional Data B+
2 Receive Data - Bidirectional Data B-
3 Transmit Data + Bidirectional Data A+
4 Not assigned Bidirectional Data D+
5 Not assigned Bidirectional Data D-
6 Transmit Data – Bidirectional Data A-
7 Not assigned Bidirectional Data C+
8 Not assigned Bidirectional Data C-
