Waveshare Industrial USB to 4Ch RS485 Converter, Multi Protection Circuits, Multi Systems Support, Aluminium Alloy Case, Wall-Mount & Rail-Mount Support

["Extending USB to 4CH RS485, allows concurrent and independent communication for each channel","Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightningproof & anti-electrostatic","Onboard resettable fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, improves shock proof performance","Onboard RS485 output terminal 120R resistors, enabled/disabled via DIP switch","Aluminium alloy case with oxidation dull-polish surface, CNC process opening, solid and durable, well-crafted"]