This invention relates to a data communication coding method used in radio communication and site bus communication transmission, in which, the transmission format protocol includes: OxAA, Ox55, a module kind of a receiving unit, the internal relative number, data packet length and ciphered algorithm numbers of the receiving unit, the model kind of the transmission unit, the internal relative number of the module kind of the transmission unit, the internal device control port number of the order-executing module/the key assignments kind internal number of a panel module device, the kind number of the order-executing module, the action instruction number, parameter number, parameter sequence number, slice numbers of the parameter of its standard instruction, sequence number of the action instruction of the standard instruction, content of the parameter data, a check code, OxFF and OxFF, in which, the OxAA and Ox55 are two starting identifying bytes of an instruction packet and the OxFF and OxFF are two ending identifying bytes of the instruction packet.