Integrate Noark 1F electricity meter and write to M-Bus to change tariff

[admin]

Try this, make sure that only one script is accessing the serial port at any time moment.

Code:

require('serial')

port, err = serial.open('/dev/RS232', {
  baudrate = 9600,
  parity = 'even',
  duplex = 'full',
})

port:flush()

addr = 0x01 -- short address
tariff = 0x02 -- selected tariff

data = { 0x53, addr, 0x51, 0x09, 0x7C, 0x01, 0x54, tariff }

len = #data

buf = { 0x68, len, len, 0x68 }
cs = 0

for _, char in ipairs(data) do
  buf[ #buf + 1 ] = char
  cs = cs + char
end

buf[ #buf + 1 ] = bit.band(cs, 0xFF)
buf[ #buf + 1 ] = 0x16

data = string.char(unpack(buf))

port:write(data)

res = port:read(1, 0.5)

if res then
  if res:byte(1) == 0xE5 then
    log('write ok')
  else
    log('reply error')
  end
else
  log('no reply')
end

port:close()