DEFAULT_SLOT_VALUE is used to get the standard idle values for a device (good values to send when it's doing nothing else). For example, on a moving light, this would be pan and tilt at 50%, intensity at zero, Color at open-white, gobo rotation off, etc.
Generally the manufacturer for a responder will know what values are good to use for defaults.
> How do we retrieve the current value of a slot?
There's no standard way to get the current value. Generally, it's assumed that the RDM controller is also sending the Null-Start-Code DMX, so it should know what level it is sending.
Generally dimmers and relay don't need to support DEFAULT_SLOT_VALUE. It's really intended for more complicated devices where zero isn't necessarily what you want the console to send by default.
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