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ZL3AI > APRDIG 14.09.03 10:19l 286 Lines 9517 Bytes #999 (0) @ WW
BID : 1911-ZL3AI
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Subj: TAPR Digest, Sep 11, 2/3
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0AR<ZL2BAU<ZL3VML
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: Re: feeding serial input data to two programs
From: David VanHorn <dvanhorn@cedar.net>
Date: Thu, 11 Sep 2003 17:25:40 -0500
X-Message-Number: 13
>To diode split put one diode in each of the two legs from the output.
>No chance of voltage backlash that way but it's really not essential,
>just a good piece of protective work for both the computer and the
>device!
there's no reason to put diodes in there.
there is no 'voltage backlash'
rs232 is only designed to drive one receiver, but on short cables, and with
reasonable baud rates, and a tail wind, it will work.
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Subject: RE: feeding serial input data to two programs
From: "WalterH" <walterh@k5wh.net>
Date: Thu, 11 Sep 2003 17:38:35 -0500
X-Message-Number: 14
Try this out..
http://eltima.com/
I have never used the product, but it seems to claim to do what your
needing..
Walter/K5WH
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Subject: Re: feeding serial input data to two programs
From: "Scott Miller" <scott@opentrac.org>
Date: Thu, 11 Sep 2003 16:00:57 -0700
X-Message-Number: 15
I've noticed that a lot of devices these days (Garmin GPS units, for
example) are not true RS-232 - they use 0v for mark and 5v for space, rather
than a bipolar voltage. I don't remember what the spec says the minimum is,
but I think max is +/- 25v.
I've done this myself on some gadget designs because it's cheap. I can use
a single transistor, a diode, and a couple of resistors for the receiver,
set the microcontroller to invert TX polarity, and you've eliminated a
relatively expensive RS-232 driver. Causes problems with some computers,
though, and it's not 'real' RS-232.
As for breaking it out to two different programs, it ought to be possible to
use an appropriate driver to mirror one COM port to another virtual COM
port, at least under NT/2000/XP. Not sure where you'd find such a device
driver, though.
Scott
N1VG
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Subject: Jeep Navigation Radio
From: Tyler Griffiths <n7uwx@comcast.net>
Date: Thu, 11 Sep 2003 17:09:39 -0600
X-Message-Number: 16
I have a new 2004 Jeep Grand Cherokee with the GPS Navigation Radio.
Any body know if there is a way to get data out of this? I can not find
anything yet.
Tyler N7UWX
--
Find out where I am...
http://map.findu.com/n7uwx-13
+....................................................................+
| Tyler Griffiths Ham Radio, N7UWX |
| http://www.n7uwx.net Cache County EC |
| n7uwx@comcast.net Bridgerland Amateur Radio club |
| (435) 750-9222 (pager) |=| http://www.barconline.org |
| tyler@sficorp.com (o o) tyler@n7uwx.net |
+---------------------------oOO--V--OOo------------------------------+
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Subject: Re: APRS/AMSAT Transit of Venus
From: "Theodore A. Antanaitis" <WA7ZZB@arrl.net>
Date: Thu, 11 Sep 2003 16:39:41 -0700
X-Message-Number: 17
Try this link for Transit of Venus info:
http://skyandtelescope.com/observing/objects/planets/article_1021_1.asp
NEVER, NEVER, NEVER view the sun directly or through a telescope or
binocular without a solar filter specifically designed for that purpose.
Your eye cannot detect damaging levels of infra-red light that a homemade
filter might pass while filtering the visible light spectrum! Your eyesight
is too valuable to risk.
More info here:
http://skyandtelescope.com/observing/objects/sun/article_94_1.asp
Ted
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Subject: Re: APRS/AMSAT Transit of Venus
From: Gonzales Andy <agonzales@arc.nasa.gov>
Date: Thu, 11 Sep 2003 17:10:20 -0700
X-Message-Number: 18
PLEASE, EVERYONE
Be extremely cautious about viewing the sun directly. Homemade "filters"
are not a good idea. Devices that have the potential for slipping off your
face are also not good. There are numerous websites out there that discuss
this transit, solar eclipses and general solar viewing techniques. As a
point of reference, solar filters for amateur class telescopes cost on the
order of $100.
The technique of putting pinhole in a sheet of thin cardboard and holding
it between the sun and another, blank sheet of white cardboard will work
also, Just don't locate the sun by directly looking at it. A ham I know who
works in a large blimp hangar showed me how the projection of the sun on
the concrete floor of the hangar, from light coming through a small hole in
the hangar wall, could be used to INDIRECTLY view sunspots.
Also, don't forget sunscreen !
--
Andy Gonzales
NASA / Ames Research Center
Moffett Field, CA 94035-1000
Bldg. N-244, Rm. 240
MS 244-19
agonzales@arc.nasa.gov
650-604-0309
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Subject: RE: feeding serial input data to two programs
From: "Georgette Sampson" <georgette.sampson@cox.net>
Date: Thu, 11 Sep 2003 19:12:36 -0500
X-Message-Number: 19
Take a look at CommEmuDrv3.zip at:
http://www.mixw.net/related.htm
Seems like you can connect the wx station to com5 and then have
your other software connect to com6??
Jo
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Subject: Re: APRS/AMSAT Transit of Venus
From: Bob Bruninga <bruninga@usna.edu>
Date: Thu, 11 Sep 2003 20:22:16 -0400 (EDT)
X-Message-Number: 20
On Thu, 11 Sep 2003, Scott Miller wrote:
>Bob, what exactly are we going to see?
>Is Venus going to be a visible speck on the face of the sun?
Thats about it. So that's why no human ever saw it until Keppler
predicted it after figuring out the laws of planet motion (and
satellites).. And only 2 people saw the first one... and it was 3 years
after Keppler died (or something like that)...
Bob
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Subject: Re: feeding serial input data to two programs
From: "Mike Yetsko" <myetsko@insydesw.com>
Date: Thu, 11 Sep 2003 20:35:50 -0400
X-Message-Number: 21
>I've noticed that a lot of devices these days (Garmin GPS units, for
>example) are not true RS-232 - they use 0v for mark and 5v for space, rather
>than a bipolar voltage. I don't remember what the spec says the minimum is,
>but I think max is +/- 25v.
As near as I recall.
The spec is 25V either way max. However, most drivers try for at least 9v
either way. Years ago, 12v used to be the target.
There IS a spec that the voltage at input must be at least +3v or less than
-3v under certain load conditions. Anything between these two are NOT
guaranteed to be one value or the other.
However, circuitry being what it is, almost all receivers will 'switch'
states someone around 1v or so, which allows most of the 'pseudo' RS-232C
ports to work.
But not all.
I've seen tricks like pulling a cap on the pin to negative voltages from
the other end on other pins, that way your end doesn't have to provide
it. I've even seen a cap system that charges up, then pulls the + end to
ground, effectively taking the - lead to a negative voltage too.
But with the advent of the MAX series (and others) of integrated switching
RS-232C interfaces, why bother. Unless you are really critical for power.
Mike
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Subject: Re: feeding serial input data to two programs
From: David VanHorn <dvanhorn@cedar.net>
Date: Thu, 11 Sep 2003 19:49:27 -0500
X-Message-Number: 22
At 08:35 PM 9/11/2003 -0400, Mike Yetsko wrote:
>>I've noticed that a lot of devices these days (Garmin GPS units, for
>>example) are not true RS-232 - they use 0v for mark and 5v for space,
>rather
>>than a bipolar voltage. I don't remember what the spec says the minimum
>is,
>>but I think max is +/- 25v.
>
>As near as I recall.
3v is the minimum space, technically, -3v is minimum mark, but the motorola
1488/89 pair works perfectly with +3v and 0v, and totally ignores negative
voltages, so most devices built to that, rather than the standard.
>There IS a spec that the voltage at input must be at least +3v or less
>than
>-3v under certain load conditions.
one standard load, also defined in the spec.
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Subject: RE: feeding serial input data to two programs
From: Phil Reed <preed@dnaco.net>
Date: Thu, 11 Sep 2003 20:38:33 -0400
X-Message-Number: 23
That's the 100 euro product.
At 06:38 PM 09/11/2003, WalterH wrote:
>Try this out..
>
>http://eltima.com/
>
>I have never used the product, but it seems to claim to do what your
>needing..
>
>Walter/K5WH
--
...phil / w8sca
"For a list of all the ways technology has failed
to improve the quality of life, press 3."
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Subject: RE: feeding serial input data to two programs
From: "Ken Brown" <W2KB@comcast.net>
Date: Thu, 11 Sep 2003 21:39:35 -0400
X-Message-Number: 24
You need two ports, one for the Peet one for the TNC, but I run XP with
UIView32 and Weather-Display ( http://www.weather-display.com ) to create
the WX file for UIView32. The file will also work with the latest WinAPRS
and perhaps other software.
73,
---Ken
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