1. The FT232RNL chip is adopted, and high-speed communication is stable, reliable and compatible. Support multiple communication interface conversion: USB to RS232, USB to RS485, USB to RS422, USB to TTL 2. The on-board self-recovery fuse and protection diode can the stable output of current and voltage, prevent over-current and over-voltage, and improve the impact resistance 3. On-board automatic ceiver conversion circuit ensures fast and stable communication between USB terminal and different interfaces without mutual interference. Onboard TTL serial port 3.3V and 5V level conversion circuit, users can switch TTL communication level through switch Product type: industrial digital isolated converter; USB interface: Working level: 5V; Interface type: USB-B interface; Interface protection: 200mA self-recovery fuse, isolated output; RS232 interface: Interface type: DB9 male; Interface protection: tube protection, surge and static protection; mission mode: point-to-point; Communication rate: 300bps~3Mbps RS485/422 interface: Interface type: terminal block; Direction control: the hardware automatically determines and controls the data mission direction; Interface protection: provide 600W -protection, surge and 15KV static protection (leave two 120R balance resistance jumper caps to enable) mission mode: point-to-many (485 mode can connect up to 32 nodes, and repeaters are recommended for more than 16 nodes; 422 mode can connect up to 256 nodes, and repeaters are recommended for more than 16 nodes) Communication rate: 300bps~3Mbps TTL (UART) interface: Working level: 3.3V/5V Interface type: terminal block Interface pins: TXD, RXD, GND, 5V/3.3V Interface protection: clamping protection diode is provided to prevent overvoltage and negative pressure and impact interference mission mode: point-to-point Communication rate: 300 ~3Mbps indicator light: PWR: power indicator