The serial port application program under the Windows operating system of the computer is completely compatible and does not need to be modified.; Hardware full-duplex serial port, built-in transceiver buffer, supports communication baud rate of 50 bps ~ 2 Mbps.; Common MODEM contact signals RTS, DTR, DCD, RI, DSR and CTS are supported; USB device interface at full speed, compatible with USB V 2.0, The standard serial port is used to upgrade the original serial port peripheral equipment, or to add additional serial ports through USB; With additional level shifting devices, RS232, RS485, RS422 and other interfaces are provided