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ISY won't connect to 2477S

clyford454
in ISY994

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Hello,

I had a 2476ST go bad and replaced it with a 2477S. When trying to add a new insteon device the ISY Admin Console says "Cannot determine Insteon engine"

It is a larger system and was in a remote building so I un-installed it and wired it into the plug next to the PLM. Same result.

So I tried another new 2477S I had, in both places, same result.

So, just for fun I tried a third new switch, 2477S, I had, this time only hardwired next to the PLM, still same result.

The last switch in the test series was a 2477S Rev 7.0

My ISY is 5.3.4

My system has multiple other 2477S switches, never had an issue.

Help.

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