GPS, UPS, Switches and other devices cables and adapters schematics
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

9 pin D-SUB male connector layout
9 pin D-SUB male connector
at the POS PC
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NCR serial powered port visual pinout:
NCR serial powered port diagram
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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