I have not found the manufacturers of devices to be a useful source of info. Best thing to do is to ping your controller through its API. The command will vary with difference controllers, but with an ISY994i controller, as an example, I would use the following command:
192.168.X.YYY/rest/nodes
X.YYY is the local address of your controller on the network.
With my controller, this lists all devices and their sub-devices. For example:
AEON LABS SMART ENERGY SWITCH (DSC06106-ZWUS)
<node flag="128" nodeDefId="UZW0019">
<address>ZW004_1</address>
<name>ZW Main Computer</name>
<pnode>ZW004_1</pnode>
<cat>121</cat>
<property id="ST" value="0" formatted="Off" uom="78"/>
<node flag="0" nodeDefId="UZW002B">
<address>ZW004_143</address>
<name>ZW Main Computer Meter</name>
<pnode>ZW004_1</pnode>
<cat>143</cat>
<property id="ST" value="104991" formatted="104.991 Watts" uom="73" prec="3"/>
Again, it's going to be completely different for your controller, but you get the idea. Look to the controller's API, not the device manufacturer, for details on what variables you can set in Z-wave devices. Also, some controllers will support functions that other controllers don't support. Which z-wave chip is in the controller vs the device will also change what you see through the controller API.