This guide is intended for use by General Services Administration staff or design consultants when
preparing specifications for interoperable building control systems using BACnet technology. It
explains the issues that need to be considered when specifying the communication details and makes
some recommendations for the choices involved. It is not a sample specification and it does not
address all issues important for a good control system specification. The focus is on specific issues
related to the interconnection and interoperation of building automation systems and devices using
BACnet. It is intended to complement more general guidelines for direct digital control systems for
building automation applications.