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9 pin D-SUB male connector layout
9 pin D-SUB male connector
at the POS PC
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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