Sauna RS485 connection with LM

[Thinklight]

Evrithing is good its working code:

Code:

require('serial')
port = serial.open('/dev/RS485-1', { baudrate = 57600, parity = 'none', duplex = 'half', databits = 8, stopbits = 1 })
port:flush()


function readack()
 local line = {}

 while true do
   local char, err = port:read(1, 5)

   if char == nil then
     return nil, err
   elseif char == ';' then
     break
   else
     line[ #line + 1 ] = char
   end
 end

 return table.concat(line)
end

port:write('get sauna\r')
res, err = readack()
log(res, err)

port:close()