485总线是通过单片机通过串口与上位机通信的总线，可以接受上位机发送的命令和返回操作，本程序为485总线通信的一个实例，希望对大家有所帮助~-485 bus through the single-chip microcomputer with the host computer through the serial communications bus, can accept PC to send commands and to return to operation, the procedur