The Ethergate Mk2 dip switches are : off-on-off-off (normal inoput mode with no universe setting).
Just read the manual, and i think if you use the device in 'input' mode - it defaults to using the ESP protocol. page 8.

So you have to run it in web configured mode off-off-off-off with artnet?
And configure it to use artnet using the web browser?