Operational principle of Barcode Scanner --S EUIC Comparing to traditional manual acquisition equipment, barcode scanner could connect with WIFI, PC and server, which improve the efficiency of collection. Barcode scanner, also called handheld terminal, industrial pda, handheld pda, could improve the real-time and high efficiency of communication data. Barcode Scanner has two core functions, they are wireless data transmission function and data acquisition function. About the acquisition data, they are most output signal sent from sensor, such as voltage signal, current signal, and conditioning circuit. About the wireless data transmission internet, there are WIFI, GPRS, 3G, 4G, which are low cost and stable. It is suitable for the outdoor conditions. With the combination of the two functions, barcode scanner could realize data acquisition and wireless data transmission. There are many advantages of barcode scanner, such as wireless transmission, short installation per...