What Is an Object Access Method?

Object access service is a protocol specification service for exchanging data. It is a lightweight, simple, XML-based protocol service. It includes 9 services and provides methods for reading, modifying, and writing attribute values, and adding and deleting objects. BACnet provides services for reading multiple attributes and writing multiple attributes. It is convenient to combine read and write operations for multiple attributes in a BACnet device into a single message, thereby greatly reducing the network's load. The conditional read attribute service provides a more complex service function. The device tests each relevant attribute according to the conditions contained in the request, and returns the values of all the attributes that meet the conditions. ^[1]