According to the BACnet protocol documentation:

Indicates whether (TRUE) this object will adjust the occupancy count of the zones for which it controls access, or not (FALSE). The occupancy count is decremented for the zone for which this Access Point is an exit point and incremented for the zone for which this Access Point is an entry point. Occupancy count shall be adjusted if the credential holder passes through the access point. How this is determined is a local matter. The occupancy count of the zones is adjusted by writing a negative amount to the Adjust_Value property of the exit access zone and the corresponding positive amount to the Adjust_Value property of the entry access zone. If this property is not supported, then the Access Point object behaves as if the value is FALSE.

Property occupancyCountAdjust of object accessPoint can be read and written using a single IOTag.

Text Parameters

Numeric Parameters

Tag Value

An integer value, where 0 corresponds to FALSE and any other value corresponds to TRUE.