def populate(self, priority, address, rtr, data):
        """
        -DB1    last 2 bits   = channel
        -DB1    first 6 bist  = pulses
        -DB2-5                = pulse counter
        -DB6-7                = ms/pulse               
        :return: None
        """
        assert isinstance(data, bytes)
        self.needs_no_rtr(rtr)
        self.needs_data(data, 7)
        self.set_attributes(priority, address, rtr)
        self.channel = (data[0] & 0x03) +1 
        self.pulses = (data[0] >> 2) * 100
        self.counter = (data[1] << 24) + (data[2] << 16) + (data[3] << 8) + data[4]
        self.delay = (data[5] << 8) + data[6]