Abstract: The connection between jacquard and loom based on communication protocols has advantages over the traditional one in many aspects,including reliability,expansibility and standardization,etc.,but it is more complex than the latter.This paper is devoted to an all-round discussion on the data interaction between jacquard control system and loom on the basis of the communication protocols,involving hardware interface,basic information,sessions in communications and so on.Taking Picanol and Vamatex looms for examples,it explains how the jacquard control system to communicate with the loom during weaving.Finally,the solution for applying a protocol controller to the jacquard control on the basis of the communication protocols is put forward.