[Hai-users] Blew up some Omnistats by accidentally using a toner on them?

[Roger Sampson]

Dan,
First, I don't have a known solution, but I certainly would try a total
power down reset, which I suspect you have already done.

Out of curiosity, I did look at the toners that I have to see their output,
both are about 1000Hz square waves, one had an RMS amplitude of 3.5 VAC and
the other about 5 Volts. Your 12VAC does seem high if it is an RMS value. 

My experience with HAI is that they are very robust, but of course not
bullet proof, or we could not afford them.  I have to think that what you
did gets repeated at least a few times by various installers, so I am
surprised at your described outcome.  I would expect, based on the
environment they are in that there would be some type of front end
protection to the RS-485 transceiver.

-----Original Message-----
From: hai-users-bounces at tssi.com [mailto:hai-users-bounces at tssi.com] On
Behalf Of Dan Butterfield
Sent: Sunday, November 09, 2008 10:01 PM
To: hai-users at tssi.com
Subject: [Hai-users] Blew up some Omnistats by accidentally using a toner on
them?

I recently had an issue where my OmniPro II had lost communication with an 
outdoor temperature sensor.  To verify connectivity between the outdoor 
sensor and the panel, I disconnected my thermostat wiring from the panel, 
and disconnected the wiring from the outdoor temperature sensor, and then 
attached a toner (sending a 12VAC tone frequency) to the 12V+ wire and the T

wire at the outdoor temperature sensor.

While I was able to verify the connectivity this way (and traced it to a 
break in the wire in the attic), I had an unfortunate circumstance.  What I 
forgot was my two Omnistat RC-80's were also connected to that wire when I 
connected the toner at the outside end.  So, while I had isolated the panel 
and the outdoor sensor in my test, I had not isolated the Omnistats, and had

sent the 12VAC tone into them via their own 12V+ and T terminals (the green 
and yellow wires).

So, when I took the toner off and connected everything back up, the outdoor 
temperature sensor works fine.  However, the OmniPro II says it can not 
communicate with the Omnistats.  At the Omnistats themselves, they seem to 
work fine in local mode, but do not communicate with the main panel (no 
outside temperature displayed, for example).

I guess I have blown the comm portion of the Omnistats by injecting that 
tone?  Is there anything else I can check?  I am assuming there's nothing I 
can do, but on the very outside chance, can anyone think of a possible fix 
for these Omnistat RC-80's?

- Dan Butterfield  (dan at butterfields.net) 

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