On Sun, 2 Sep 2007, Rick Green wrote:
On Sun, 2 Sep 2007, Rick Green wrote:
Last spring at Dayton, I splurged and bought myself a refurbished Peet
Bros. weather instrument, an 'Ultimeter 500'. It has a 6-pin rj-style
connector on the side of the display unit, which according to the manual
can be used for the optional PC data logger.
/snip/
I eventually found some info on the peet bros. site itself:
http://www.peetbros.com/HTML_Pages/faqs.htm
Data is 2400/8/N/1
Pinout is:
1 - special
2 - +5v
3 - Output
4 - N/C
5 - Ground
6 - Input(U2000only), N/C(U100;U800)
My Ultimeter 500 appears to be an Ultimeter 100 with a built-in inside
temperature sensor.
Additional (Critical!) information: Peet Bros numbers their modular
connectors Backwards from the way I'm accustomed to. Looking at the
female 6-pin modular, pin 1 is on the RIGHT with the keyway on the bottom.
I've got a cable made up, and am looking at data with hyperterm on an old
win98 machine. Next step is to install a multi-port serial card in my
linux machine so I can feed the data to xastir.
Each data field is four ascii characters representing hex digits. When
I interpret the hex digits as a binary integer, it seems to make sense.
Temperature is in tenths of a degree F. I'm curious if they have a means
of representing negative values? From the manual, I see that Peet Bros.
is a Florida company - maybe they didn't realize it sometimes gets cold up
here!
--
Rick Green, N8BJX
"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."
-Benjamin Franklin
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