USB is a new PC interconnection protocol and has many advantages, It is a tendency that USB replaces the RS232 as computer and peripheral standard interface.
USB作为一种新的PC机互连协议，因其诸多优点，有逐渐取代RS 232串口，成为计算机和外设标准接口之趋势。
USB(Universal Serial Bus) interface is a newly bus interface standard. It has flexible power supply mode, very high transfer rate and plug and play virtue.
接口是一种新兴的总线接口标准，它具有灵活的供电方式、较高的传输速率和即插即用等优点。
Adopt strict charge to manage the circuit, it can protect with overload, undervoltage, short circuit, etc. output for standard USB power supply interface.
采用最严格的充电管理电路，具有过载，欠压，短路等多重保护，标准usb电源接口输出。
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