Pinout wiring of Photmultiplier variable HV power supply?

[VintageCollector]

Hello everyone!

I have this variable Photomultiplier High Voltage power supply (K and M PN 1037). It is rated for 8kV @ 0.1mA max. I do not see any potentiometers to make any voltage adjustments either, which leads me to believe it maybe controlled remotely via the serial plug. There are 9 wires as in the picture. I can think of the following connections ( LV +, LV -, Pot-REF, Pot - WIPER, Pot - COM, HV COM) no idea what could be the other, just my wild guess  .

Any one has come across this power supply and could possibly help with the pinout if so? I think it maybe an Agilent- Bruker PSU, but I could be wrong.
Thanks guys!