ABSTRACT
In effort to standardize communications between different vendors’ building automation systems, Public Works Canada (PWC) has developed and published in 1992 a standard known as Canadian Automated Building (CAB) protocol. The CAB standard was published by PWC and offered as public domain. Vendor-specific controllers on a CAB network can share information on a backbone LAN — either via so-called CAB-Gateways or directly, if the controller or PC operating work stations (OWS) is CAB compatible. Vendor-specific controllers with CAB protocols or CAB-Gateways are so called “network node devices” residing within their respective “areas.” A CAB point is a representation of a physical point or point defined in the program residing in CAB-compatable controllers or CAB gateways. Every CAB-Controller, CAB-Gateway, and OWS on a CAB network is uniquely identified by a network address. The application layer is designed to support communications among application programs residing in different vendor’s controllers or OWS’ over the network.
