Data transmission method and device for instrument lower computer

The invention discloses a data transmission method and device for an instrument lower computer. The method comprises the steps of numbering data with independent physical meanings in each lower computer storage space; selecting the content of the data according to communication protocol demands of an upper computer and selecting the data needing to be transmitted; adjusting the sequences of the data according to the communication protocol demands of the upper computer, thereby generating communication data; storing communication data to an upper computer to-be-read space in the lower computer; and transmitting the communication data in the upper computer to-be-read space to the upper computer. According to the method and the device, the data with the independent physical meanings is extracted from the instrument lower computer storage space, the data is numbered, selected and adjusted according to the onsite protocol demands and then the data is transmitted. The problem that the transmission data content of t