This is a spare part for a Siemens PG 710, 730 or 750 field programmer. It talks PS/2 to the main unit, no USB. The original cables either had a 6-pin mini-DIN plug with standard pin-out or large 7-pin DIN-plug with the pin-out of pins 1-5 being identical to the IBM AT keyboard plug. If you don't have a cable, you'll need to trace the leads from the connector to the controller to identify the voltage and signal pins. With the signal pins, you'll have to do trial-and-error to find the proper matching of DAT and CLK lines.
