As the use of private protocols becomes popular in distributed data acquisition system

it is urgent to test interfaces of these systems.The interfaces cannot be tested by general communication protocol testing equipments

so a simple strategy of how to develop an efficient custom interface testing system with a testing module based on PC is proposed.In this paper

we focus on the design and implementation of how to realize an interface testing module based on ARM.Analyses of the interface characteristics

basic structure and software processes of the interface testing module

and application method of interface testing with the PC and the interface testing module

are discussed.Experimental results show that the custom interface testing system well meets the testing requirements.This proposes a way to do a rapid development of custom interface testing systems.