From what i have found in the forums so far, controlling the thermostat is a programmable function. (i.e. write a program to do what it is you want, depending on the thermostat. I am leaning towards the T1800 at this point.)
If you can force a button within the configuration screen, and have it run programs as if it was pushed locally, then I think I have the answer I have been looking for as my UI is the configuration screen, just controlled from Ohio or anyplace I currently have a computer to access, or my iPad and an internet connection.
The 4 smaller buttons on the keypad are more of a status indication rather then someone physically doing anything with them. Pushing those buttons would have no effect on anything. Using older programming terminology, I would write a master program that would be activated when the "occupied" button was pressed. This master program would "call" each sub program in the order needed, pausing when needed to allow things to do what was needed, then call the next program etc, etc, etc until everything was running. The occupied button push would also inform me when the people "check in", with the "unoccupied" button being the check out time. The unoccupied button would have the reverse effect of shutting the house back down.
Any button pressed, eventually, would be an alarm system that would cause all of the fixtures to beep like a security alarm. By using a calendar programmed into the ISY to set rental "times" and dates that the buttons would and would not alarm if pushed.
The refrigerator, stove etc., would also be a sub program called from the master start up program. Once started, the LED on the 6 button (one of the 4 remaining buttons) would stay on, indicating the completion of that portion of the start up sequence. During the start up process, the LED would blink.
Granted, as the system gets bigger, it gets better but also more complicated. For now, I just want to be able to control the HVAC system and maintain the humidity as needed from Ohio, with the water fans outlets etc., as modifications and new equipment allows.
Mainly I am only down there about 14 days a year, so installing the fixtures, syncing them with the ISY is about all I want to do on vacation unless it rains. Any physical buttons that need to be pressed to link them with the ISY I'll do when I install the fixtures, and them come back to Ohio and do the programming on the ISY from up here when I'm board.
Steam...