Design of Virtual Terminal for Agriculture Machinery Based on ISO11783

According to the virtual terminal (VT) technology specification of ISO 11783 standard, a virtual terminal product is designed. Through analyzing the type, definition and relationship of objects in the object pool of working set, the data structure of VT´s object pool is created based on the software development principle of object-oriented method. The parsing algorithm of events and processing algorithm of message are developed. A multi-node ISOBUS network including VT is constructed, which can correctly transmit the object pool, activate and display the mask, process the messages from ISOBUS network. When electronic control farm implements connect with the tractor, the VT can be used as man-machine interface for parameters adjustment and work data display.