Is HABmin showing no channels, or is it showing that there are no items linked to the channels? If the latter, you may be seeing the symptom of a HABmin bug. Refresh the page and it should show the linked items.
You could try putting the zwave binding into debug mode and check for activity in openhab.log when you press buttons on the device.
The database entry for this device was updated pretty recently. What version of openHAB are you running? If you’re on 2.3, it might make sense to upgrade to 2.4 M5 or a recent snapshot version. Be advised, if you are on 2.3 and you do upgrade, please read the post on changes to the Z-Wave binding.