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25-Pin D to 9-Pin D Null Modem Cable
9-Pin D to 9-Pin D Null Modem Cable
DB-25S
Connector
to P.C.
DB-9S
Connector
to P.C.
DB-9P
Connector
to Adapter Cable
DB-9P
Connector
to Adapter Cable
2
3
4
5
6
7
8
20
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
TXD
TXD
TXDTXD
RXD RXD
RXDRXD
RTS
RTS
RTS
RTS
CTS
CTS
CTS
CTS
DSR
DSR
DSRDSR
GND
GND
GNDGND
DCD
DCD
DCD
DCD
DTR
DTR
DTRDTR
Null Modem Cable Pinouts