BatiBus was a network protocol for building automation that was introduced in 1989 and has since been succeeded by KNX.
It was a relatively simple low-cost protocol that did not rely on dedicated chips.
[1] The system was run by the BatiBus Club International (BCI),[2] 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.
BatiBus communicated over twisted pair lines and in topologies that could be divided into several segments.