GPIB（General-Purpose Interface Bus） is a type of common Device Communication Interface. It was developed by HP in 1965 and named as HP-IB at first. Until 1975, the HP-IB was defined as an IEEE-488 Standard by the IEEE Association and renamed as GBIP. In 2003, the IEEE-488 was updated to the IEEE-488-2003 and defined the 8-bit Digital Parallel Communication Interface. So the Transmission Speed can be up to 8Mbps, the distance of the cable can be up to 20m and fourteen Devices can be connected at most.