Description
RS232C和RS422/485串行通信接口，RS232C地电气接口电路是单端驱动，单端接收地电路，有公共地线，这种接口电路不能区分有用信号和干扰信号，抗干扰能力差，故其传输速率和传输距离收到很大限制。RS422/485采用平衡驱动，差分接收电路，取消了信号地地接法，平衡驱动器相当于两个单端驱动器，当输入同意信号时其输出是反相的
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