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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.


Description (may be empty)
1 DCD  
2 TX  
3 RX  
4 DTR  
5 GND  
6 DSR  
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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