Re: ot2m wx lacrosse 2350/2355 and ultimeter 100/2100
- This is all very confusing for someone just starting out. The bottom
line, which is the best-bang-for-the-buck weather system.
--- In email@example.com, Scott Miller <scott@...> wrote:
> > read the ultimeter
> > 2100 is the best and is working bt do i need the humidity sensor?
> > how is the wiring config
> It will work without the humidity sensor, it just seems to report
> incorrect value sometimes if it's missing. I haven't been able to
> down that bug yet.
> > from the ultimeter to ot2m??and how is the config in the ot2m??
can i use
> > the config i have on
> > lacrosse and how do i get the ot2m to TX,..?.. with the lacrosse
> > config i made some times
> > it did work and somt times not
> The LaCrosse interface seems to be just plain unreliable. It can
> many retries to get all of the required information. If something
> changed with the timing in the new models, it wouldn't surprise me
> doesn't read reliably.
> The Ultimeter stations, on the other hand, are very reliable. You
> need to set the port mode to AUTO and set the baud rate and it
> Davis Vantage Pro support is working now, and will be in the next
> firmware release.
> To: firstname.lastname@example.org
> From: tom@...
> Date: Tue, 20 Jan 2009 01:33:50 +0100
> Subject: Re: [tracker2] ot2m wx lacrosse 2350/2355 and ultimeter 100/2100
> On Wed, 03 Dec 2008 00:51:23 +0100, Scott Miller <scott@...>
> > Both of those Ultimeter models should work, though I've got at least one
> > report of a problem when the humidity sensor isn't attached.
> > How do you have the LaCrosse stations connected?
> I've been trying to help Stephan with his LaCrosse problems.
> As far as I can tell, the LaCrosse violates the RS-232 standard,
> as there is no connection to pin 5 on DB-9, which is GND.
> Instead they use pin 4, DTR and pin 7, RTS when connecting to the PC.
> Those two are both output signals from the PC, and negative when idle.
> This is probably a devious scheme to save a few cents (eurocents) on the
> When you tested the LaCrosse function, did you have the WS connected
> without a Y-cable?
> If the LaCrosse needs a negative voltage to function, it would not work on
> the Y-cable.
> Let's hope they use diodes, otherwise there could be a problem with pin 4
> being +5V/+12V
> and pin 7 being -10V.
> BTW I found an error in the Tracker2 manual. It says pin 7 is CTS, and pin
> 8 is RTS.
> It's the other way around. The schematic is correct.
> Email: tom@... (ttwist@..., lb8x@...)
> Phone: +47 21688655/90662366, Ham call sign: LB8X Locator: JO49UA
> Snail: Tom Twist, Kirkeveien 8A, N3970 Langesund, Norway
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