This is the cable connector for NCR powered serial connector, as found on the realpos series.
|Description (may be empty)|
|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