USB to RS-485 Converter protection circuitsu

From the shop's description

Industrial grade RS485 to USB converter which can withstand tough working enviroment. The housing is made of hardened ABS plastic with a reinforced terminal header for easy connection of communication wires. This RS485 to USB converter is electrically protected against static electricity, high voltage spikes and other dangerous voltage spikes which can damage your equipment or data signaling. This protection is accomplished by four Transient Voltage Suppressors, one for each data line. Automatic send data control is enabled by default so no external flow or handshake control is needed. Specifications Directional control: Automatically determine and control the data transmission direction. Baud rate： 300-921,600bps, Automatically adapt serial port signal speed. Transmission distance: 1.2KM (at 9,600bps) I nterface protection: 600W lightning strike, surge protection and ±15KV ESD protection Operating system: Windows, Mac OS, Linux Environment: -40℃-85℃, relative humidity 5%-95%