USB to RS485 communication; Adopt original FT232RL, fast communicating, stable and reliable, better compatibility Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostatic Onboard self-recovery fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, improves shock resistance 3 LEDs for indicating the power and transceiver status Development resources download: www.waveshare.com/wiki/USB_TO_RS485