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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 RS485 output terminal 120R resistors, enabled/disabled via DIP switch Onboard resettable fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, improves shock proof performance Aluminium alloy case with oxidation dull-polish surface, CNC process opening, solid and durable, well-crafted