Hi Milosh,

The settings I previously posted should of worked. The frequency resolution box needs to be checked for the WJ200, and frequency needs to be sent as a single holding register per manual and settings above will do this. The Wj200 Modbus parameter settings are easily found with a google search so I'm assuming these are set correctly.

99.9% of times when helping trouble shoot ModbusEZ or Huanyang plugin the RS485 converter was the problem. This can be checked easily with a free or trial Serial Port Monitor and see if WJ200 is reading and replying. I post a link for a trial version SPM below.

https://www.eltima.com/products/serial-port-monitor/


Dan