data selection method in multistage bus data transmission

The invention belongs to an aviation electromechanical bus data transmission technology, and relates to a data selection method in multistage bus data transmission. According to the invention, the equipment communication state on the data transmission path is combined with the data validity judgment of the data source end to form a multi-level data validity judgment mechanism, so that accurate selection of data in multi-level bus data transmission is realized. Wherein the multi-stage data validity judgment mechanism is divided into a first-stage data validity judgment, a second-stage data validity judgment and a third-stage data validity judgment, and the data is considered to be valid only when the three-stage data validity judgment is valid. According to the data selection method in multi-stage bus data transmission, the communication states of all devices on the data transmission path and the data validity of the data source end are comprehensively considered; A multi-level data validity judgment mechanism