HP Compaq nx5000 series Maintenance And Service Manual page 188

Connector Pin Assignments
Pin Signal
1 Carrier detect
2 Receive data
3 Transmit data
4 Data terminal ready
5 Ground
Pin Signal
1 Connector housing
2 Ground
3 TPB+
4 TPA+
A–6
Table A-9
Serial
Pin Signal
6 Data set ready
7 Ready to send
8 Clear to send
9 Ring indicator
Table A-10
1394
Pin Signal
5 TPA-
6 TPB-
7 Power
Maintenance and Service Guide