Specifications

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