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How do I reset Omni LT controller board which is not responding to serial port/PC Access? Is there a way to do it without disconnecting the battery?   I access the serial port of our old Omni LT controller via an external serial-to-ethernet board (so that I can access it from anywhere).  The...

Our 2001-era Omni LT presently works fine with two HAI Omnistat RC-80s controlling our 2 independent HVAC units.  I am thinking of replacing RC-80s with Nest thermostats as our local power company is almost giving Nest for free. Is it possible to replace RC-80 with a Nest thermostat and still be...

Our 2001-era Omni LT's console has been constantly showing the error message "BATTERY LOW TRBL NOW". It gives an audio alarm (on console) at oddest hours of night one can imagine, almost every night, as well.   The Owner's Manual says I should replace the battery; recommended battery type is a...

Does anyone has experience with HAI/Leviton Cellular Communication Center (C3) http://dealerqa.leviton.com/sites/dealer.leviton.com/files/C3-Instruction-Sheet-English.pdf ? It uses GSM network though. Actually you don't need any high speed LTE network for this; reliability is the most important...

Hi, I have been observing that the clock on my Omni LT was drifting a few seconds every day and as a result I have to re-synch clock every week using PC Access Dealer (via Communications -> Set Controller Time).     I noticed that there is a field called "Clock Adjust" under Miscellaneous...

I need some help with debugging X10 control functions of a 2001-era Omni LT system. (This is somewhat a continuation of a request I made here some time ago. I could download the config files from the Omni LT controller board using Dealer version of PC Access as suggested by pete_c and ComponY)...

Where can I find a copy of the "official" specification of X10 standard, both physical layer and network protocols?   Internet search gave me, among several non-technical/layperson blurbs about X10 history and whatnot, the following technical...

Hi there! I'm trying to get an HAI Omni LT system with X10 devices that came with our house accessible via PC Access.  The previous owner of the house gave me all the user manuals, PC Access CD (and floppy disks :-)), invoices, etc dating back when the system is installed in 2001.  I could get...