I have just installed the Cooper/Aspire RF9540-N dimmer with RF9542-Z accessory dimmer and have come across some issues with them losing sync. Once I figured out the association part I did get them to talk to one another, pressing the buttons on the switches themselves will always reflect the same on the other switch but once I use Veraedge to change the light level or on/off (on the master) the accessory switch does not reflect it on the switch itself… this creates problems as the switches get out of sync and then when I go to use the accessory dimmer it will want to move the light to next on/off status or light level as per the accessory switch (forgetting what the current master switch status/level was). Also, when I use the accessory dimmer it does not reflect that change in the Veraedge, so it seems that the accessory dimmer is just not being recognized properly by Vera. I went so far as to go into advanced settings for the accessory dimmer and changed all the appropriate files(I thought- device_type, device_file, & device_json) to match the master dimmer hoping it would then see it as an actual lighting device(it sets it up as a scene controller remote no matter what I select at setup) and thus start recognizing it appropriately, but this did not do anything although it does appear as a dimmer in Vera and I can move the level as seen on the accessory dimmer itself but it does nothing.
So, I would appreciate any help with this. I am new to this, but it seems that things just do not go very smoothly with all of this. I do not think the creators have spent enough time actually testing and working through any problems. I would not have thought when I bought these switches that this would have been an issue at all. I would think two ‘associated’ switches would always just be ‘associated’, not just some of the time.
Thanks in advance for any help!
Have no fear, they are working properly, there is just a little extra work you have to do!
First the Aux switch does not support Instant Status, so it will take a minute or so for the UI to update on the Vera if you turn on/off the light from the Aux. Most three way switches work this way unfortunately, there is no fix for it.
See this thread for a variety of options on how to keep your switches in sync (direct association does not work if you are trigger the lights from a scene or from the Vera UI which is also normal) but this one you can fix: http://forum.micasaverde.com/index.php?topic=31000.0
Just wanted to give an update on this. I did as shallowearth described in his linked post as a way of trying to keep these dimmers in sync and has almost completely done it for me. What I did was setup a scene that triggers when the master changes to on/off and have it simply execute the luup code as described by shallowearth(it grabs the level of the master and updates the accessory with it) and also as described in the post I added a scene executing the same code every minute as when I change the level mid-way to mid-way (no on/off change) the accessory will not update or in the case of using the accessory switch itself in the same manner that change will not make it back to Vera(quickly) so it would actually change back to the previous level (on the switch) and this would cause an issue if I would then go to change the level again on that same switch(would go opposite way first), so to kind of combat that I have decreased the amount of time between poll intervals of the master switch so that it will at the very most be only back to that old level very briefly. I have also hidden the accessory switch in the Vera display(method described many times in other posts) because it is not needed and so I don’t have to keep seeing the ‘success’ message every time the code executes. So, this is working for me as well as I guess I could have hoped (the whole system just seems a little imperfect and problematic). So, much thanks to shallowearth again! 
I do have one more question please…
with cooper switches, being that they are instant update(other than the accessory switches) do I have a need to have them set to poll at all? (other than these master switches I have in the situation described above)
I am trying to find a way to reduce the nodes being polled so I could hope for even faster refresh times on that master switch poll update.
Thanks
Is the only problem you are having is keeping the dimmer level on the Aux in sync? Do not change the polling values on the Vera it will destabilize your mesh and make it slow, set the polling values back to their defaults (usually 1 minute). I think you want to still poll, sometimes the instant status might not make it or get lost so the poll is you back up to keeping things in sync. I have found that trying to use a script every one minute doesn’t actually work as you have noted. I should remove that from my recommendations. There real is no legitimate way to make the Vera poll faster with out bad consequence later when you add more devices.
Changes is dimmer level only from the master does not support instant status and is mostly cosmetic, you can still dim up or down on the aux if it is a little out is sync. Remember that the only time the aux dimmer level is going to get out of sync is if you are using a scene or controlling the master from an app/web UI.
If keeping the dim level in sync is very important to you…
If you are updating the dimming level from a scene just update the Aux’s display at the same time in the scene using the advanced properties in the scene editor.
If you are updating the dimmer level a lot from an app/web UI. Let the aux get out of sync, it will catch back up the next time you do a off/on. Since dimming alone doesn’t support instance status it will just make you crazy as you have noted trying to keep it perfect.
Other less appealing options if the out of sync dimmer light is making you crazy. Replace the Aux dimmer with a Aux switch instead (obviously you lose the ability to set dimmer values from the Aux location). Use the battery powered Cooper dimmer (doesn’t have an led to get out of sync), but also does not fit in a gang box. use a different brand dimmer that supports association that does not have a led. Use a scene controller in the Aux location that just has some preset dimmer levels (lose full range of dimming values).
Honestly I have found that the aux dim level being slightly out of sync just doesn’t bother me that much, but I rarely if ever change the dimmer level from an app/web UI. So it just doesn’t happen all that often, and the on/off catches it up just fine.