Programmable Instrument Common Interface And Gpib Bridge Design

This work is to develop GPIB—RS232, USB, LAN programming converter through which main control computer controls DSO(Digital Storage Oscillograph) with bandwidth 1GHz and sampling frequency 2GSPS. This paper gives the detailed discussion about the design principle of programming converter GPIB—RS232, USB, LAN in hardware and software. The programming converter GPIB using ARM7 is connected to main control computer through RS232 interface, or USB interface, or LAN interface. In this way the consuming time and resource of CPU in DSO can be saved in a certain extent. Also, most of the communication and decoding tasks can be partaken by GPIB programming converter. All these can facilitate the real-time working of DSO. Moreover, the converter can also be used by other program-controlled apparatus through which these program-controlled apparatus can be easily controlled by main control computer through GPIB or connected to the automatic test system through GPIB because of the converter's standard RS232 interface, or USB interface, or LAN interface.ARM7 that is the central of the converter serves as the bridge between the circuit of GPIB interface and the circuit of RS232 interface, or USB interface, or LAN interface. The principle chart of converter and the design of PCB had been completed.The design about monitor software between GPIB and RS232 is completed and debugged successfully. At the same time, the design about monitor software between GPIB and LAN is completed.Through on-line running of converter, main control computer and DSO debugging, we complete the debugging work of integration the hardware circuit of converter and part of monitor system software. The GPIB programming function of main control computer to DSO is achieved.