Serial interface is one of the major communication modes between microcomputer and peripheral equipment. Serial communication plays a very important role in the data transmission. In this communication mode only two signal lines are needed for unidirectional data transmission and can be operated simply. The serial control and transmission are accomplished by applying the McBSP serial mode in DSP. The data and instruction transmission are accepted by applying Object Oriented language VC++. This method has been applied in the technology of laser alarming detection and its efficiency has been proved by experieIrice.