The RVD-102 takes a mark bit of -5 to -15V and a space bit of +5 to +15V

I do not have the optional loop interface. I suppose to use this with my model 14 TD I would need to build a circuit to take 100V/0V and convert to 10V/-10V or similar, correct? (AKA low voltage serial)

Also, I have a Xitex UDT-170, but no manual. Anyone seen one before?

Thank you,

-Eric