USB V2.0 compatibility, full-speed USB device interface, and standard USB-A male design; direct power supply from the PC via a USB connection. For upgrading original serial peripherals or adding more serial ports via USB, use an analog standard serial port; The serial application supports both 3.3V and 5V TTL target systems and is completely compatible with Windows-based computers without requiring any changes; To accommodate odd, even, blank, and no parity, support 5, 6, 7, or 8 data bits; Allow the serial port to transmit control signals, transmission rate MODEM liaison signals, and serial receiver ready signals; RS232, RS485 and other interfaces are supported by the plus level conversion module; (Separate sales are available for supporting modules.) EPP mode and MEM mode are two parallel port interface methods;