Design of Portable Test Equipment Based on USB Technology

摘要

This paper describes the implementation of a field level test equipment for some kind of carrier system and analyses the hardware of the ATS based on USB interface. Aiming at some specific signals of the system, the paper introduces the circuit design of the data acquisition unit, the USB interface based on the special purpose interface chip (PDIUSB12 and AT89C52 MCU) and the interface changeover circuit between the RS-232 /USB. Depending on the new unit, we can use a notebook PC and a small box to test the system automatically and replaces the industrial control computer and the hand-operating device of the old test system.