HP ProBook 6550b HP ProBook 6455b, 6555b, 6450b,and 6550b Notebook PCs - Maint - Page 206
Serial (select models only), Universal Serial Bus
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Serial (select models only) Pin 1 2 3 4 5 6 7 8 9 Universal Serial Bus Signal 1 Data carrier detect Received data Transmitted data Data terminal ready Signal ground Data set ready Request to send Clear to send Ring indicator Pin Signal 1 +5 VDC 2 Data 3 Data + 4 Ground 198 Chapter 8 Connector pin assignments
Serial (select models only)
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
Universal Serial Bus
Pin
Signal
1
+5 VDC
2
Data
3
Data +
4
Ground
198
Chapter 8
Connector pin assignments