串行口有RS232C/RS422/RS485等几种标准。RS232C是目前应用最广泛的 种标准。目前已广泛用于计算机与外设 间的近程连接 -RS232C/RS422/RS485 such as serial port has several standard. RS232C is the most widely used standard. Has been widely used in computer and peripheral connections between the