Modbus TCP connection datakom d-200 mk2

[admin]

It's strange that you get "invalid data" first. This might indicate that the device is faulty.
I've made a mistake in the previous test script so it does not log communication in case of an error. Run this and post what you get in Logs tab:

Code:

if not mb then
  require('luamodbus')
  mb = luamodbus.tcp()

  mb:setresponsetimeout(5)
  mb:open('10.36.0.25', 502)

  res, err = mb:connect()
  if res then
    
    buffer = {}
    mb:setdebug(function(msg)
      buffer[ #buffer + 1 ] = msg
    end)
  else
    log('modbus connect failed ' .. tostring(err))
    mb:close()
    mb = nil
  end
end

if mb then
  reg10240, reg10241, reg10242, reg10243, reg10244, reg10245, reg10246, reg10247 = mb:readregisters(10240, 8)
  
  if reg10240 then
    mains_l1_voltage = reg10240 / 10
    mains_l2_voltage = reg10242 / 10
    mains_l3_voltage = reg10244 / 10
    genset_l1_voltage = reg10246 / 10
    log('voltage values', mains_l1_voltage, mains_l2_voltage, mains_l3_voltage, genset_l1_voltage)
  else
    log('modbus read failed ' .. tostring(reg10241))
    mb:close()
    mb = nil
  end

  log(table.concat(buffer))
  buffer = {}
end