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USOPTL4 is a USB to one port RS-422/485 converter. Supporting 2-wire RS-485 or a 4-wire RS-422/485 communications, this device is great for any application that requires long range or multi-drop capabilities. It uses pluggable terminal blocks on the RS-422/485 side and has a pair of LEDs that indicate data being transmitted or received. USOPTL4 includes special circuitry that adds 2000 volts isolation protection against ground loops and voltage spikes. It draws power from the USB port so no power supply is required.