I'm having an issue getting timed events to work with my Aprilaire + XP8 2-way. In Canada we use Celsius and even though you can set the driver to Celsius the Driver commands are only in Farenheit so the Thermostat must get confused as it does not change set points throughout the day as I have specified in my events. Any help would be great!

I ran into this myself. You can use the driver in Celsius and it will feed back properly and it will control the 8870 but you need to use a RS-232 string to set the temperature from a timed event. For example I have created a macro to set the temperature to 17° Celsius and used the command:

SN1 SH=17\r

That is a workaround and I have made tech support aware of this issue. Seems they forgot the rest of the world uses metric.

You got that to work, I tried that myself and it still didn't work???

Have you set the thermostat ID? Does it respond to a RS-232 command through a terminal program? Make sure that you are sending ot through the right port on the XP-8. Is this just a single thermostat? If so set it to 1. Have you set up the driver. I know these may be silly questions but ...

Yes the the ID's are set, it responds to RS-232 although there's about a 5 second delay between button pushes and the action, the port is correct, there are 2 thermostat's, one set to ID1 and the other ID2, yes the driver is set up. I tried everything I could possibly think of when the timed events wouldn't work because that was a main selling feature for the client.

Can the thermostat be controlled via Hyperterminal? I am assuming the 8870 is reading Celsius on the display. Make sure the thermostat is not in Network Override mode. Try an RS-232 command only on a key and see if it responds.