3. Push the button to scroll forward, you can install special functions.
Those functions are buzzer on „EIN“ (drawing Q1) or buzzer off „AUS“
(drawing Q2, silent alert for UPS warning) and self-test on „EIN“
(drawing R1) or self-test off (drawing R2, UPS makes the battery test
within 10 seconds. When the self-test was successful it indicates
drawing E1, if not it indicates drawing E2 and error message).