The is a proprietary USB-to-serial conversion cable that bridges your PC’s USB port with the serial programming port on Zelio Logic smart relays.

Even with the correct driver, you may encounter connection errors. The two most common errors are and DC46_86 . These occur when you attempt to use the new H2.x cable with the old driver from Zelio Soft V5.0 or earlier.

Expand , right-click Zelio SR2 USB01 H2.x , and choose Uninstall Device (checking the deletion box). Hardware Controller Layer 4

Look at the white plastic connector piece that inserts into the Zelio smart relay. If you see "SR2USB01 H2.0" or higher printed directly on it, you have the newer hardware variant.

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