Motherboard connectors  > HP pinouts
Secondary COM port cable for the Hewlett Packard dc7900 series workstations.


Device 1
Pin Number
Device 1
Pin Name
Direction Device 2
Pin Number
Device 2
Pin Name
1 DTR -> 4 DTR   
2 RX <- 2 RX   
3  CTS <- 8 CTS   
4   DSR <- 6 DSR   
5   TX -> 3 TX   
6   RI <- 9 RI   
7   GND   5 GND   
8   GND   5 GND   
9   +5.0V   NC No connect   
10   +3.3V_AUX   NC No connect   
11   RTS -> 7 RTS   
12   Comm B Detect   5 Pull this pin to GND  Must be connected to GND at boot time to enable 2nd the serial port.
13   DCD <- 1 DCD   
14   -12V   NC No connect   
15   +12V   NC No connect   


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16 pin IDC male connector
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HP dc7900 secondary COM port header cable visual pinout:
HP dc7900 secondary COM port header cable diagram
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