Can I turn on/off RS-232 control from the front panel of an AVR/M processor?

Can I turn on/off RS-232 control from the front panel of an AVR/M processor?

YES – By pressing and holding the DIRECT button for about 5 seconds. This will toggle RS-232 Control ON or OFF. If the Control setting is set to IP then pressing the DIRECT button for 5 seconds will set Control to OFF, pressing the Direct button again will turn RS232 Control ON.