HP ProBook 6545b - Serial; Universal Serial Bus

9–4 Maintenance and Service Guide
Connector pin assignments
Serial
Universal Serial Bus
Pin Signal
1 1 Data carrier detect
2 Received data
3 Transmitted data
4 Data terminal ready
5 Signal ground
6 Data set ready
7 Request to send
8 Clear to send
9 Ring indicator
Pin Signal
1+5 VDC
2Data
3Data +
4 Ground