此程序是及iic、rs485、rs232于一身的单片机c语言编写，通过rs与外界通信，rs485与内部设备通信，iic与6320通信，控制声音输出db值。-this procedure is and iic, rs485, rs232 in an MCU c language, rs through communication with the outside world, rs485 and internal communications equipment, and 6,320 iic co