LM5 3rd RS485 port does not work for Modbus

[Andrey Esaulov]

Ok, what about reading from a script? Do you have GND connected between LM and slave devices? Have you tried using different port?

YES, on other port it works fine without any phisical changes.

I tried reading the script on port 3. It works without problems in time.
   

Then I tried to read through the button on the Modbus tab. At first the reading was going on, then after a couple of minutes it stopped - CRC Error.