The only parameter settings that appear to be possibly related to this are these ones.
I am not 100% sure about the difference between “Automatic Control” and “Manual Control” presumably automatic control is when the dimmer is controlled by another device via a Z-wave association group.
There are different user manuals for different firmware versions of the Dimmer 2 modules. The latest is v3.5. The Dimmer in my lounge is v3.3.
Within the Dimmer device in Vera, under Device Options, I added Parameters 5,6,7,8 as monitor only initially expecting it to show me the current values of these parameters however it did not which was unexpected.
I then attempted to set parameter 8 to 20 with 2 bytes Dec. The default value is 5 = 50ms. So 20 = 200ms.
However after saving, reloading and refreshing the browser the parameter value is not set.
The correct user manual for a Dimmer 2 module with v3.3 firmware does have these four parameter settings, so I am not sure why its not being set ?
EDIT: I’m an idiot LOL. Automatically Configure was set to NO. I have changed this back to Default Behaviour and now the values are showing correctly.
I think my ceiling light now turns only more slowly but kinda hard to tell. I will try increasing Parameter 8.
EDIT 2: I have changed Parameter 8 to 255 with 2 byte Dec. Its maximum value.
This parameter makes no difference to the ramping when turning on or off the light.
All it appears to do is slow down the dimming or brightening.
Changing Parameter 7 from a value of 1 to 10 with 1 Byte Dec. this changes the dimming step. It now Dims / Brightens in 10% steps rather than 1% steps.
I don’t think any of these parameters are for altering the “Ramping” so the light turns on from off gradually and doesn’t just jump to fully on right away.
I can’t see any other parameters in the user manual that are related.
It might be possible some other way, I seem to recall there was an old plugin for ramping or it might be possible with some LUA code ? It needs more research.