Modbus sent single value bit

[admin]

Try this:

Code:

require('luamodbus')
mb = luamodbus.tcp()
mb:open('10.30.0.242', 8000)
mb:connect()
mb:setslave(1)

value = mb:readregisters(1000)

function setbit(value, bitnr)
  local mask = bit.lshift(1, bitnr)
  return bit.bor(value, mask)
end

value = setbit(value, 8)

mb:writeregisters(1000, value)

mb:close()

The recommended approach is to use profiles.