RS485 resident

[rw_echo]

When I press the RS485 panel button, I can use the LM resident script to read the command message of the panel. The message received every time I press the button is the same. I want to control the light switch, and my script has implemented the light on action. How can I turn off the light? Can anyone help me? Thank you in advance. 

button cmd(hex): 02 20 10 11 00 01 00 80 4E E3 02 20 10 11 00 01 00 FF 0F 03

code:

Code:

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if not port then     require('serial')   port = serial.open('/dev/RS485-1', {     baudrate = 9600,     databits = 8,     stopbits = 1,     parity = 'none',     duplex = 'half'   })       function read()       local buf = {}         while true do         local timeout = #buf > 0 and 0.5 or 19         local char = port:read(1, timeout)                 if char then           buf[ #buf + 1 ] = char:byte()         else           return buf         end       end     end   end     res = read()   --log(res)     if #res == 20 then     for key, value in pairs(res) do            if res[4] == 0x11 and ( res[8] == 0x80 or res[18] == 0xFF ) then                  if grp.find("13/1/21")["data"] ~= true then                 grp.write("13/1/21",true)                 log("key1sucessfull")             end              end        end   end

[admin]

For loop after if is not needed otherwise you write might run 20 times in a row.
To invert the current value use this:

Code:

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if #res == 20 and res[4] == 0x11 and (res[8] == 0x80 or res[18] == 0xFF) then   value = grp.getvalue('13/1/21')   grp.write('13/1/21', not value) end