You need to do something like this:
Press button A on your DSD Black Max II -> Simulate keyboard key press of CTRL+SHIFT+A
You need a software that supports your USB device (DSD Black Max II) and recognizes if you press the buttons on it, so you can assign any keyboard shortcut to it.
An example website with an example software would be something like this:
http://keysticks.net
Assign keyboards shortcuts to the buttons and then go to ESO, enable the addon that Votan mentioned above so ESO supports keystrokes like CTRL+SHIFT + ....
Go to the control settings, choose a keybind to assign, enable it and press the key on your DSD Black Max II. It should recognize the CTRL+SHIFT+A e.g. then and assign it to the keybind.