Read RS232 send to KNX Group adress

[AndersH]

Hi.

Is it anyone who knows how to read from RS232 and send forward to a KNX group adress.

i will receive 4 different values that should call for a scene on the KNX side....

0/r, 1/r, 2/r and 3/r, i have seen some script examples but how do i make it send to the KNX group adress

require('serial')
port = serial.open('/dev/RS232', {
  baudrate = 38400,
  databits = 8,
  stopbits = 1,
  parity = 'none',
  duplex = 'full'
})


This must be to open the port, but the rest i don`t know how, i think it must be some "port:read" and  "write to"

Best regards