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Pin-outs
Modem Cable
9-pin to RS-232 25-pin
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Cable connector: 9-pin female
RJ-45 Pin
Assignments
Screen
TxD
RxD
RTS
CTS
DSR
Shell
3
2
7
8
6
Ground
DCD
DTR
5
1
4
RS-232 Modem Port
Cable connector: 25-pin male
1
2
3
4
5
6
7
8
20
Screen
TxD
RxD
RTS
CTS
DSR
Ground
DCD
DTR
Pin assignments are identical for 10BASE-T and 100BASE-TX RJ-45
connectors.
Table 12 Pin Assignments
Pin Number
Signal
Function
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 MDI
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-
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