Occurs when an external event is received from a Rangefinder extension.
Use this event to write code that performs any desired action when an external event is received from a Rangefinder extension.
A Rangefinder extension can trigger this event by setting the EventMask in the INSTRUMENT structure. The ID of the OnExEvent is based on the bits set in the EventMask. Up to 32 event flags (enumerated 0 - 31) can be set by setting any of the bits of the EventMask member of the INSTRUMENT structure. The OnExEvent event will fire for each bit set and the event ID can be determined in a script by reading the ID property of the ThisEvent object.