Input Signal Requirements

Input Signal Requirements for XM2 Labs SLG-20 Retractable Landing Gear

The SLG-20 is controlled by a pulse-width modulation (PWM) input signal. The pulse width ranges for valid input events are shown in the table below.

PWM	Input Event
800-1199us	DOWN
1200-1800us	NEUTRAL
1801-2300us	UP
Other or No Input	FAILSAFE

If the input signal is not within a valid range, a FAILSAFE event will be triggered. If no input signal is detected for 500ms, a FAILSAFE event will be triggered. (This is configurable with the parameter FS_MS)

If a FAILSAFE event is triggered, the SLG-20 Legs will LOWERED.

UP events will cause the legs to RAISE.

DOWN events will cause the legs to LOWER.

NEUTRAL events will have no effect.

If the input signal is in the UP range on boot, the legs will not raise until the input is toggled to the DOWN range. This is a safety precaution for powering up the aircraft, in case the switch is in the wrong position.