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Andover Infinity T-Stat Reads -327 Degrees

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Andover Infinity T-Stat Reads -327 Degrees boisenative 12-01-2006
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Posted by Jake on December 1, 2006, 7:46 pm
>
>         It's a simple thermistor in a stock pre-configured VAV box
> controller, I forget the specs offhand. I seem to recall it does that
> -327 on open, and will show 999 on short. All depends on how the
> point is mapped in software, of course - you could scale it any way
> you want. So, 'open' is most likely, as you say.
>
>

A lot of 8 bit cards will do that... 32767 being the biggest number (or
-32767 being the smallest) they can handle... without tricks (-;...

Jake

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Posted by thrugoodmarshall@hotmail.com on December 4, 2006, 11:50 am

Jake wrote:
> >
> >         It's a simple thermistor in a stock pre-configured VAV box
> > controller, I forget the specs offhand. I seem to recall it does that
> > -327 on open, and will show 999 on short. All depends on how the
> > point is mapped in software, of course - you could scale it any way
> > you want. So, 'open' is most likely, as you say.
> >
> >
>
> A lot of 8 bit cards will do that... 32767 being the biggest number (or
> -32767 being the smallest) they can handle... without tricks (-;...
>
> Jake

Gee, I've always needed 16 bits to go from -32768 to 32767. Howdja do
it in 8?
And, if a 32-bit device wants you to call Dallas, TX, you know it's
broke!


Posted by on December 4, 2006, 11:58 am
On 4 Dec 2006 08:50:56 -0800, "thrugoodmarshall@hotmail.com"

>
>Jake wrote:
>> >
>> >         It's a simple thermistor in a stock pre-configured VAV box
>> > controller, I forget the specs offhand. I seem to recall it does that
>> > -327 on open, and will show 999 on short. All depends on how the
>> > point is mapped in software, of course - you could scale it any way
>> > you want. So, 'open' is most likely, as you say.
>> >
>> >
>>
>> A lot of 8 bit cards will do that... 32767 being the biggest number (or
>> -32767 being the smallest) they can handle... without tricks (-;...
>>
>> Jake
>
>Gee, I've always needed 16 bits to go from -32768 to 32767. Howdja do
>it in 8?

        Compression :-)


>And, if a 32-bit device wants you to call Dallas, TX, you know it's
>broke!

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Posted by Jake on December 4, 2006, 6:23 pm
> Gee, I've always needed 16 bits to go from -32768 to 32767. Howdja do
> it in 8?
> And, if a 32-bit device wants you to call Dallas, TX, you know it's
> broke!
>

I'm not a microprocessor engineer, but I believe it was done with a
swapping-bit scheme.

Many, many PLC systems are (were) based on Zilog Z80 architecture... and
they did one heck of a lot of creative things with that little 'invention'.

Jake

Posted by AKS on December 1, 2006, 2:46 pm
Re Hello
It would be nice if you can gave little more info.
for example what type is it ?
Liquid/Gas fill sensor ?
RTD sensor ?
Thermistor sensor ?
Thermal couple sensor ?
Process input sensor ?
Digital readout scale ?
Analog readout scale ?
Make / Model ?
Read only ?
Read and Control ?
Range of Temp. is to be use at ?
Suspected problem old age like me !!!

> Hello all,
>
> I have a thermostat that's going to a cooling only box above an office
> in an eleven story building that's reading a temperature of -327.68
> degrees, and I'm pretty sure that's not quite right. Any idea what the
> cause is, and what the fix might be?
>
> Thanks
>



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