Development of data communication system applied to electrical instruments based on USB interface

In order to meet the requirement of large data processing and high speed data exchanging between the host computer and electrical instruments, a scenario about data communication system based on USB interface is designed and realized. The basic communication system configuration and architecture are discussed. The detail of hardware interface about a specific USB controller chip PIDUSBD12 is described. The method and workflow about the development of USB firmware, device driver and application software are emphasized. An example used in Spare Power Automatic Switching (SPAS) test instrument is shown. This scheme will accelerate the data communication speed and improve the communication system expansion flexibility of electrical instruments. The hardware interface technique and software programming method can be used for reference in designing other electrical instruments based on USB interface.