Get information about the USB-ISS

        Querying will return three bytes;
        - the module ID (7),
        - firmware version (currently 2),
        - the current operating mode.

def get_iss_info(self):
        """
        Get information about the USB-ISS

        Querying will return three bytes;
        - the module ID (7),
        - firmware version (currently 2),
        - the current operating mode.
        """
        self.write_data([self.ISS_CMD, self.ISS_VERSION])
        response = self.read_data(3)
        if len(response) == 3:
            response = self.decode(response)
            self.module = response[0]
            self.firmware = response[1]
            self._mode = response[2]
        else:
            raise USBISSError("Could not get version details")