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Advantech Usptl4 Rs-422/485 Inline Usb Converter - Non-Isolated (Usb Cable Included)Model USPTL4 is a USB to One-port RS-422/485 converter that supports 2-wire RS-485 or 4-wire RS-422/485 Communications. It is ideal for applications requiring long-range or multi-drop capabilities. Model USPTL4 uses Pluggable terminal blocks on the RS-422/485 side.T..