Tulikivi sauna heater relay board

[MikeBrignate]

Hello

Could somebody help me with Tulikivi relay board for the sauna heater, trying to read sauna temperature with CMD 11, but the result always 0. When I connecting my touch panel, then pannel starts asking for data from the relay board and a log is showing some values. So the connection is established, but the request is wrong.

Code:

require('serial')
port, err = serial.open('/dev/RS485', {
  baudrate = 9600,
  databits = 8,
  stopbits = 1,
  parity = 'none',
  duplex = 'half'
})
port:flush()

port:write(0xB)

data = port:read(2,3)

byte = string.byte(data)

log(string.format("%o, %x, %d", byte,byte,byte))

port:close()

protocol attached

Thank you