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500 and 600 do NOT come with remote start, 550 does.
On the datasheet, do you know what the significance of (+/-) (dual polarity) versus built-in relay is? Some of them have dual polarity, some of them have built-in relays, some have both. These are usually for things such as power door locks.
I might look into the 300 anyways, though, it's got most of the same stuff as the 5/600, but doesn't have as many zones or built-in relays for things....
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