Andrew: WXT to WeeWx via SDI-12
dlr
Andrew,
You have all the tools at hand, it
looks like.
That print out is an excellent guide.
Vaisala does a nice job with
documentation.
I'm no protocol expert, but having the
voltage to the WXT means it
will run. The three output wires
include a ground, so the receiving
unit does NOT need any connection back
up to the power from the solar
battery you mention, just the three
wires.
I run RS232 and RS 465 (I think those
are the numbers) and I just afix
them to the three terminals on a
serial to usb dongle that I use for a
Win10 PC.
I have a RaspPi system running with an
IP address to a Rainwise, and
after telling WeeWx (in the station
driver) where to look, WeeWx just
goes out and reads the incoming data
stream.
I will take a look at the WeeWx WXT
driver to see if there is much in
the configuration header, but I think
you are just about ready to roll.
I would wire the M12 pins to the
RaspPi (I don't know if there are
multiple to choose from, that's where
the configuration on the WXT
configuration in WeeWx comes in) and
it should just listen to that
input and start parsing the string
once it gets a start location on
the input. I know it does that for
another type of situation I have
too, so I wonder if you are
overthinking it, just as I did to start
with.
The final thing is to use your WXT
configuration cable and software to
make sure that you have chosen the
type of output you want, and that
it is a constant output, no polling,
and again I didn't open up the
manual yet to look, that may be the
only way that the SDI12 runs,
maybe not.
I had one configuration early on in
which I had it set to poll and of
course the weather display software
didn't know to send a poll
request, and the WXT was sitting
waiting for a request to send and
nothing happened.
You sure can just wire it and see how
it goes, and have the WeeWx
station set, but I think you said you
already have data flowing in,
that it was working with a different
interface?
I have to run, will promise to look
this afternoon to see if I can
make sure the advice I have given you
is OK, and that the WXT
configuration is as you've said you
have and needed.
Dale
Andrew Terhorst
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