A data communication method, system and gateway

Example discloses a data communication method, a gateway and a system according to the present invention, wherein the method comprises: receiving a gateway MVB MVB to control module sends the instruction information, the instruction information includes an object instruction and an instruction operation, said traction instruction object comprises identifying sub-module; the instruction information into MVB controller Area network CAN bus instruction information; subject according to the instruction traction converter comprises a sub-module identifier of the command information CAN the traction given sub-module corresponding to the identifier traction sub-module, so that the traction sub-module performs a corresponding operation according to the operation instruction. Accordingly, the present invention can solve the conventional gateway data transmission and processing time is long, and the problem easily lead to errors occurring during transmission of data.