Checks if the device is in configuration mode or not.

        Rad config starts with baseprompt>config.

def check_config_mode(self, check_string=">config", pattern=""):
        """
        Checks if the device is in configuration mode or not.

        Rad config starts with baseprompt>config.
        """
        return super(RadETXBase, self).check_config_mode(
            check_string=check_string, pattern=pattern
        )