I notice my DS18S20 and DS18B20 sensors, if there's a network failure or.. 
perhaps a hardware failure from overheating the sensor when I'm soldering wires 
onto the leads, reports "85" as the temperature.

As far as I can tell the "crc8" value is correct in these instances.

a) why does it do this?
b) this really is not a helpful number. if it was -999 then I could say, "ah 
that's an error value" but 85 is a reasonable temperature for the stuff I'm 
doing
c) is there any way to tell that this is an error 85 as opposed to the sensor 
actually being at 85°C ?

Many thanks.
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