RS485 stopped working on windows 7 after many years

Hello All,

I have a custom built instrument that uses two RS485 items and two RS232 items. I wanted to service the instrument and updated a driver on the windows or something like that, and the RS485 connections do not respond and run into timeout. What would be the solution?

The voltage on the RS485 wires are very low 100-500 mV.

Thanks
A
 
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