BatiBus was a network protocol for

building automation Building automation (BAS), also known as building management system (BMS) or building energy management system (BEMS), is the automatic centralized control of a building's HVAC, HVAC (heating, ventilation and air conditioning), electrical, light ...

that was introduced in 1989 and has since been succeeded by KNX. It was a relatively simple low-cost

protocol Protocol may refer to: Sociology and politics * Protocol (politics) Protocol originally (in Late Middle English, c. 15th century) meant the minutes or logbook taken at a meeting, upon which an agreement was based. The term now commonly refers to ...

that did not rely on dedicated

chips ''CHiPs'' is an American crime drama television series created by Rick Rosner and originally aired on NBC from September 15, 1977, to May 1, 1983. After the final first-run telecast on NBC in May 1983, the series went into reruns on Sundays fr ...

. The system was run by the BatiBus Club International (BCI), which was founded by the Swiss company Landis & Gyr and the French companies AIRELEC, Electricité de France and Merlin Gerin (who originated the concept). Predominately used in France and captured by French Electrical Standard NF C 46620, it provided layers 1, 2 and 7 of the

OSI model The Open Systems Interconnection (OSI) model is a reference model developed by the International Organization for Standardization (ISO) that "provides a common basis for the coordination of standards development for the purpose of systems inter ...

. Approximately 500,000 BatiBus network units were installed, mainly in France. BatiBus communicated over

twisted pair Twisted pair cabling is a type of communications cable in which two conductors of a single circuit are twisted together for the purposes of improving electromagnetic compatibility. Compared to a single conductor or an untwisted balanced ...

lines and in topologies that could be divided into several segments. Each segment was powered with a 15 volt power supply rated at 150 milliamps. A device (

node In general, a node is a localized swelling (a "knot") or a point of intersection (a vertex). Node may refer to: In mathematics * Vertex (graph theory), a vertex in a mathematical graph *Vertex (geometry), a point where two or more curves, lines ...

) could be reached at one of 240 possible addresses. In addition, 16 group addresses could be established under which all nodes in a group could be reached. The nodes avoided data collisions via

CSMA/CA Carrier-sense multiple access with collision avoidance (CSMA/CA) in computer networking, is a link layer multiple access method in which carrier sensing is used. Under CSMA/CA, nodes attempt to avoid collisions by beginning transmission only af ...

and had data flow controls. The maximum data transfer rate was 4800 bits/s.

References

Network protocols Building automation {{compu-network-stub