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16 pin IDC male connector layout
16 pin IDC male connector
at the motherboard
Secondary COM port cable for the Hewlett Packard dc7900 series workstations.

The signals are 3.3V TTL not RS232.

Device 1
Pin Number		 Device 1
Pin Name		 Direction Device 2
Pin Number		 Device 2
Pin Name		 Description
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   

 

9 pin D-SUB male connector layout
9 pin D-SUB male connector
at the bracket
Pinout status: +2 -0
According to 2 reports in our database (2 positive and 0 negative) the HP dc7900 secondary COM port header cable pinout should be correct.

Is this pinout
NO DIY devices
HP dc7900 secondary COM port header cable visual pinout:click to enlarge
Source(s) of this and additional information: http://pinouts.ru/SerialPorts/Serial9_pinout.shtml; http://www.hp.com/ctg/Manual/c01549447.pdf
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