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9 pin D-SUB male connector layout
9 pin D-SUB male connector
This is the cable connector for NCR powered serial connector, as found on the realpos series.

Pin
Number

Pin
Name
Description (may be empty)
1 DCD  
2 TX  
3 RX  
4 DTR  
5 GND  
6 DSR  
7    
8    
9 +12V  +12V if 1,4 and 6 are shorted

pc toggles a bit on the dtr line and check the dsr and dcd lines. if the lines are shorted, pin 9 (normally ri) is used to provide 12v power. see patent for more information

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NCR serial powered port visual pinout:click to enlarge
Source(s) of this and additional information: http://www.google.com/patents?id=L0QPAAAAEBAJ&printsec=abstract&zoom=4&dq=6651177+patent
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