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。
RS232 interface which is a standard serial interface mode has been widely used in computer communication.
RS232接口在计算机通讯中应用非常广泛，成为一种标准的串口通讯方式。
The standard Bus Couplers have an RS232 interface at the bottom of the front face.
标准总线耦合器具有在正面底部的 RS232 接口。
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