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A-5
D-620003-0-20 Rev J
CONFIDENTIAL
DB-25 to DB-9 Null Modem Cable
A.6
DB-25 to DB-9 Null Modem Cable
A DB-25 male to DB-9 female Null modem cable connects a 232 Port Expander to a
Unison Main Hub, or to connect a modem to the Main Hub when using OpsConsole
to monitor the system. Table A-3 lists the pinout of the cable for Unison and
Figure A-4 shows a diagram of its wiring.
Figure A-4
DB-25 Male to DB-9 Female Null Modem Cable Diagram
Table A-3
DB-25 Male to DB-9 Female Null Modem Cable Pinout
25-Pin
Signal
9-Pin
Signal
20
2
3
6,8
7
5
4
DTR
TX
RX
DSR, DCD
GND
CTS
RTS
1, 6
2
3
4
5
7
8
DSR, DCD
RX
TX
DTR
GND
RTS
CTS
DB-25 Male
Connector
Pin
DB-9 Female
Connector
Pin
1
2
3
4
5
6
7
8
20
1
2
3
4
5
6
7
8
9
