User's Manual

A-4 InterReach Unison Accel Installation, Operation, and Reference Manual PN 9000-10
620021-0 Rev. A
A.4 DB-9 to DB-9 Null Modem Cable
A DB-9 female to DB-9 female null modem cable is used to connect the AdminMan-
ager PC to an Accel Hub. A cable is included with AdminManager. Table A-2 lists
the cable pinout and Figure A-3 shows a diagram of its wiring.
Figure A-3 DB-9 Female to DB-9 Female Null Modem Cable Diagram
Table A-2 DB-9 Female to DB-9 Female Null Modem Cable Pinout
From Signal To Signal
P1-4 DTR P2-6, P2-1 DSR, DCD
P1-6 DSR P1-1, P2-4 DCD, DTR
P1-3 TXD P2-2 RXD
P1-2 RXD P2-3 TXD
P1-5 GND P2-5 GND
P1-7 RTS P2-8 CTS
P1-8 CTS P2-7 RTS
P1-9 N/C N/C N/C
Note that for each DB-9 connector, pins 1 and 6 are tied together and sent to pin 4
of the opposite connector; thus, providing the required handshake signals.
DB-9
Connector
Pin
DB-9
Connector
Pin
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9