Somfy RS-485 Protocol

[Joep]

With the script below i now can control one motor. But that motor was already programmed by a remote control. Now my question is if someone can tell me if and how it's possible to program a new motor from scratch on please as i totaly don't understand the protocol and all of its functions. There is no manuel explaining the RTS protocol so i'm really confused..

value = event.getvalue()

require('serial')
port = serial.open('/dev/RS485', {
  baudrate = 4800,
  databits = 8,
  stopbits = 1,
  parity = 'odd',
  duplex = 'half'
})

if value == false then
res, err = port:write(string.char(0x7F,0xF2,0xFA,0xC9,0x7B,0xFA,0x00,0x00,0x00,0xFE,0xFE,0x06,0xA5))
else
  res, err = port:write(string.char(0x7F,0xF2,0xFA,0xC9,0x7B,0xFA,0x00,0x00,0x00,0xFE,0xFD,0x06,0xA4))
end

log(res, err)

You should know address of motors and implement your sendRS485 function with your connection parameters. 
Check code below it would be great if it works you, but I can't be responsible for it. 
It work with my motors.

Code:

-- 1/0 up/down
function rs485windowControl(value, address)
  msg = bit.bxor(0x80, 0xFF)
    len = bit.bxor(0x0D, 0xFF)
    con = bit.bxor(0x05, 0xFF)
    sr1 = bit.bxor(0xFE, 0xFF)
    sr2 = bit.bxor(0xFF, 0xFF)
    sr3 = bit.bxor(0xFF, 0xFF)
    de1 = bit.bxor(0x72, 0xFF)
    de2 = bit.bxor(0xBB, 0xFF)
    de3 = bit.bxor(0x05, 0xFF)
    da1 = bit.bxor(address, 0xFF) -- address

    local da2
    if value then
      da2 = bit.bxor(0x01, 0xFF)
    else
        da2 = bit.bxor(0x02, 0xFF)
    end

    sum = msg + len + con + sr1 + sr2 + sr3 + de1 + de2 + de3 + da1 + da2
    sum1, sum2 = Int16ToBytes(sum, 'little')

    sendRS485(string.char(msg, len, con, sr1, sr2, sr3, de1, de2, de3, da1,da2, sum2, sum1))
end


function rs485windowStop(address)
  msg = bit.bxor(0x80, 0xFF)
    len = bit.bxor(0x0D, 0xFF)
    con = bit.bxor(0x05, 0xFF)
    sr1 = bit.bxor(0xFE, 0xFF)
    sr2 = bit.bxor(0xFF, 0xFF)
    sr3 = bit.bxor(0xFF, 0xFF)
    de1 = bit.bxor(0x72, 0xFF)
    de2 = bit.bxor(0xBB, 0xFF)
    de3 = bit.bxor(0x05, 0xFF)
    da1 = bit.bxor(address, 0xFF) -- address

    da2 = bit.bxor(0x03, 0xFF)
    sum = msg + len + con + sr1 + sr2 + sr3 + de1 + de2 + de3 + da1 + da2
    sum1, sum2 = Int16ToBytes(sum, 'little')

    sendRS485(string.char(msg, len, con, sr1, sr2, sr3, de1, de2, de3, da1,da2, sum2, sum1))
end

function rs485windowSetChannel(address)
  msg = bit.bxor(0x97, 0xFF)
    len = bit.bxor(0x0C, 0xFF)
    con = bit.bxor(0x05, 0xFF)
    sr1 = bit.bxor(0xFE, 0xFF)
    sr2 = bit.bxor(0xFF, 0xFF)
    sr3 = bit.bxor(0xFF, 0xFF)
    de1 = bit.bxor(0x72, 0xFF)
    de2 = bit.bxor(0xBB, 0xFF)
    de3 = bit.bxor(0x05, 0xFF)
    da1 = bit.bxor(address, 0xFF) -- address



    sum = msg + len + con + sr1 + sr2 + sr3 + de1 + de2 + de3 + da1
    sum1, sum2 = Int16ToBytes(sum, 'little')

    sendRS485(string.char(msg, len, con, sr1, sr2, sr3, de1, de2, de3, da1, sum2, sum1))
end

function rs485windowMy(address)
  msg = bit.bxor(0x80, 0xFF)
    len = bit.bxor(0x0D, 0xFF)
    con = bit.bxor(0x05, 0xFF)
    sr1 = bit.bxor(0xFE, 0xFF)
    sr2 = bit.bxor(0xFF, 0xFF)
    sr3 = bit.bxor(0xFF, 0xFF)
    de1 = bit.bxor(0x72, 0xFF)
    de2 = bit.bxor(0xBB, 0xFF)
    de3 = bit.bxor(0x05, 0xFF)
    da1 = bit.bxor(address, 0xFF) -- address

    da2 = bit.bxor(0x04, 0xFF)
    sum = msg + len + con + sr1 + sr2 + sr3 + de1 + de2 + de3 + da1 + da2
    sum1, sum2 = Int16ToBytes(sum, 'little')

    sendRS485(string.char(msg, len, con, sr1, sr2, sr3, de1, de2, de3, da1,da2, sum2, sum1))
end

function rs485windowHeight(value, address)
  local tilt = 1
  if value <= 127 then
    value = 128 - value
  else
    tilt = 0
    value = 256 - value + 127
  end
  msg = bit.bxor(0x81, 0xFF)
    len = bit.bxor(0x0D, 0xFF)
    con = bit.bxor(0x05, 0xFF)
    sr1 = bit.bxor(0xFE, 0xFF)
    sr2 = bit.bxor(0xFF, 0xFF)
    sr3 = bit.bxor(0xFF, 0xFF)
    de1 = bit.bxor(0x72, 0xFF)
    de2 = bit.bxor(0xBB, 0xFF)
    de3 = bit.bxor(0x05, 0xFF)
    da1 = bit.bxor(address, 0xFF) -- address
  da2 = value

    sum = msg + len + con + sr1 + sr2 + sr3 + de1 + de2 + de3 + da1 + da2
    sum1, sum2 = Int16ToBytes(sum, 'little')

    sendRS485(string.char(msg, len, con, sr1, sr2, sr3, de1, de2, de3, da1,da2, sum2, sum1))
end

function Int16ToBytes(num, endian)
  if num < 0 then
      num = bit.band(num, 0xFFFF)
  end

  highByte = bit.rshift(bit.band(num, 0xFF00), 8)
  lowByte  = bit.band(num, 0xFF)

  if endian == "little" then
      lowByte, highByte = highByte, lowByte
  end

  return highByte,lowByte
end

Thanks for your answer and sharing your code. My biggest issue is how to set the correct channel? How is this done? First with a Somfy remote and once paired you can also control it by the script or how does it work?