Dear list,
This wish has been a longtimer. The first time I requested this feature was
in LV 2.2. We now happily arrived at 7.1 but this useful feature is still
not there. Not enough requests could be the the answer from the developers.
You can do these kind of things with the picture control but
I need to generate a continuous waveform (sine, square, triangle) that
is less than 1 Hz. I have tried doing it manually by sending out a 100
point array, one point every X ms based on the frequency setpoint. For
example if the frequency is 0.1 Hz I send a point out every 1 ms. The
problem I have
Have you tried making the LED you want to illuminate a Global
variable?
Ah, yes, serial communication is supposed to be simple, but it is
often frustrating. I have done a fair amount of this, but none under
LV7.
Whether or not you get errors depends on the nature of the
communication. For instance, suppose you send a request for status
information to your serial
When I paste a part of one diagram to another, Labview 7 crashes with
The thread 'Win32 Thread' (0x910) has exited with code 0 (0x0).
Unhandled exception at 0x0084d46e in LabVIEW.exe: 0xC005: Access
violation reading location 0x8168592c.
vicky,
I am unfamiliar with the lv_vfw.llb, and have not used it before.
However, I noticed that you stated that you are able to grab in color,
just not snap in color. If this is the case, why not just perform a
grab and then extract a single buffer from this grabbed data, which
would likely be
The timeout value was just set at the default. How do you know how
long your stream of data is?
The purpose of my application is to input a setpoint temperature to
the refrigerator/heating circulator and also read what temperature the
circulator is actually at. The circulator recognizes certain
Greetings Nick:
You should be able to get good results with your technique.
(You're essentially doing a poor-man's
Direct Digital Sythesis, when reading a pre-constructed table like you
are doing) Another way to do this is generate a sine wave, using one
of the sine generator vi's and then
Thanks for responding, Shane. All of that was very informative. I
still have some comments:
1) Could you elaborate on the statement references [force] everything
through the GUI thread? This kind of makes sense to me, but I
haven't found much info on the web besides using references for
This can be done, but it will take some work. There are two
approaches. You can use the PICTURE functions, and build the diagrams
up a layer at a time. (Your PICTURE vi's are loop through, meaning you
can take the output of one, say a grid, and input it to another, to
overlay a pointer, for
Thanks Ed
Here i want to add something.
Rightnow i am doing the same thing what you said in your mail. I agree
with your statement.
But i am seeing some properties in property node which talks about
make current value default. From this how will i do that?
Is it possible to do with VI server?
thanks for the comments, ryan. It's always nice to hear from the
people who develop the software.
1) It seems to me that allowing people to pass pointers to complex
data structures would allow for more efficient memory management. I
know about refnums, but Shane and others seem to imply that
hi,
i shall explain my problem , i want to plot the SCR char with the
gate current applied (without gate current applied is done n working
fine) so , for a comparative study of the effect of gate current i
want to plot multiple curves , at the moment i m prompting the user to
enter
- Original Message -
From: John Brohan [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Monday, May 10, 2004 7:19 PM
Subject: Graphs placed over indicators causing slow operation.
Hello
I have an XY graph which is visible sometimes and not visible at others.
It
seems important what it
I really wonder who will win the contest...
/Andreas
Normally, it is located on the left bottom corner of the functions
palette
Hi Olga,
Finally, I decided to execute my Matlab program siparatly from LABVIEW
acquisition program.Since, when matlab P. is long, the time of
calculation by matlab is so long as compared with the time required
for LABVIEW execution. So, it is not possible to execute both deux
program in the same
Hello,
yes, I have edited the run time menus, and they work fine when the VI
is run from within labview, or built into an application. The trouble
comes when I view the panel remotely using the web server. None of the
run-time menus are there.
rgds
neil
Running under Linux, after having installed all packages, I still get
the above responce, when I click the Find examples... button.
Hello
I try to continously acquire data from two channels of PCI-6025E in
Win XP, stand alone LV7.1 application.
It works well on 100kS/s, but it got real difficulty with going to
maximum speed 200kS.
I set buffer to 1M, which is enough for 100kS, but soon is getting
overloaded in case of 200kS
how can I display on a string the symbol omega (ohms)
I would like that when you write lowercase char in a control string
these char be converted automaticaly in uppercase char in this string
My apologies for intruding on the list, but
we have an opening for a software engineer.
We are a National Instruments Alliance Member in Cary, NC (Raleigh-Durham
area). The qualifications for which we
are looking are LabVIEW programming skills (a must) and text-based language
capability
Bonjour,
Quel outil utilisez vous ? LabVIEW,CVI,Visual ...?
Une solution consisterait =E0 utiliser deux boucles en paral=E8lle sous
LabVIEW ou deux thread si vous utilisez le C ou C++ et mettre en
oeuvre un m=E9canisme de synchronisation tel que la notification.
Par exemple en LabVIEW, une boucle
Ok first go through the first list I posted here and work out what you
are missing. Post a list of what you are missing. i.e do you have the
manuals for the MUX2?
There is no reason that I am aware of that the student edition won't
do. At the moment I have not fully transferred to 7.X so 6.1
Friends
I used to run a very simple batch file that appends one file on to the end
of another. It was a scheduled task in the Task Manager under W98. Now I
have XP Pro SP1 and I can execute the batch file manually any time without
errors but when I execute it from the Task Manager, whether I let
I hav just returned from a week-long trip and will be moving forward with
the judging.
Regards,
-Jim Kring
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Andreas Nilsson
Sent: Tuesday, May 11, 2004 12:27 AM
To: Info-Labview Mailing List (E-mail)
In the case of the former do I use much more memory or slow down the
execution of my program more than in the case of the latter?
In part of your question you call the control a graph, and in other
parts a chart. The answer depends a bit on which you are showing and
hiding. Graphs only
Hi
Open the Block Diagram of the vi named Open Block Diagram Refnum.vi
and read the note I put in here. It says Exposed in several location:
ex: ..\National
Instruments\MAX\Assistants\LVCGen\LV70\mxwScript_ClusterConnector.vi
For more scripting utility and exposed primitive go to the LAVA forum
Sweet VI Good job. how did you get the ref to the block diagram. I
have been looking for it.
Hi,
the error 1003 normally indicates a not runnable subVI.
It wonder if the VI is running under LabVIEW 7 or if the error only
occures when building an executable? Perhaps you can post your VI, so
that I can check it on my computer?
A few weeks ago, I had a similar problem running a LV6.1 VI
Hi Nanorui,
Could you tell me a little more about your setup? Do you happen to be
running RedHat with LabVIEW 7.0?
To my knowledge, this issue has been fixed in LabVIEW 7.1.
You might also be seeing something similar if you installed LabVIEW
into a non-standard location.
If you run LabVIEW as
If you have multiple copies of LabVIEW on your computer, see if it was
installed to another version. If so, you can uninstall and then
reinstall making sure that the installer is pointed to the correct
LabVIEW folder.
We don't have a driver for this instrument, and I wasn't able to find
any LabVIEW drivers by the manufacturer, so you'll probably need to
program it using the user manual for the instrument. I think the user
manual you need is probably found here:
I think that this might have to do with your Shortcut if that makes Sense..
I had something similar happen, and I deleted my Desktop Shortcut Icon and
made another, and the issue went away.
WinXP also allows by right clicking and selecting properties a compatibility
mode in which the
Sorry if this is an stupid question, but I was wondering if someone
could tell me how to do the following: I'll be running two .vi's
simultaneously during some work I'm doing and rather than having both
front panels up at once I'd like to link them so that when a
particular property being
Hello,
It is possible to command a Modbus device with LabVIEW. You will need
some sort of OPC server that speaks Modbus. Once you have that, you
can use the Datasocket VIs in LabVIEW to communicate with your Modbus
device (via the OPC server). If you do not have an OPC server,
National
Hello jcnoble,
If you experience a crash in any National Instruments software
component (if you look at the Properties for nipalk.sys, you should
find a Company tag that says National Instruments Corporation or
similar), I would first recommend upgrading all software to the latest
available
Hi Jeremy,
Thanks for your reply. The LabView installation was the first install
on a brand new PC. I did some poking around yesterday with Windows
Explorer and was able to locate the PID conponents directories. The
PID control blocks show up with Explorer, but are not visible among
the regular
Pour le tableau c'est bon j'ai trouv=E9 cela venait en fait d'un mauvais
=E9chantillonnage; Merci
Sacha gave a valid answer but let me try to help.
1st
I do not have LV 7.1 on my machine yet so I can not open your example
VI.
2nd
...why is 2nd While Loop [and Enum to Interger and status's Enum
constant] in main State Case?
The small while loop inside one of your states is the logic used to
Bonjour,
Les cartes PCI-4472 et PCI-4474 ne sont pas dans la liste des cartes
compatibles avec l'exemple Multi-Device Synch-Shared Timebase-Cont
Acquisition.vi.
Ceci peut expliquer pourquoi le noeud de propri=E9t=E9 renvoie une erreur
DAQmx.
Vous pouvez utiliser l'exemple Multi-Device Sync AI
I have one numeric control in frontpanel. I am dynamically changing
the value of that control. Once if i quit the program and if i opened
again what ever value i entered before quitting the VI, it should
appear as a default value. Is it possible to set the current value as
default while VI is
I built a dll in LV 7. One of the inputs was an array of strings. LV
created the following typedef for this input:
typedef struct {
long dimSize;
LStrHandle elt[1];
} TD2;
typedef TD2 **TD2Hdl;
The function prototype generated by LV is:
void __stdcall AddRow(TD1
Hi fbrutus,
yes, I care! Your hack certainly works but pretty cumbersome.
I was looking for modifying a text file but I want the original date
not to be overwritten. I want to be able later to sort my measurement
data by the original date.
If LabView isn't capable of doing this task, isn't there
Redrawing XY Graphs
Is there any technique to add new points to an XY graph without re-drawing
the whole thing? Dropping points does not seem to be an option in this
application.
Yours Sincerely
John
John Brohan National Instruments LabVIEW expert in Montreal
Traders Micro We
I would also like to know the answer for that incase anyone replying
separately to John.
Thanks
Shankar
Shankar K. Subramanian
TSS ESG
Northboro RD Center
Saint-Gobain
-Original Message-
From: John Brohan [mailto:[EMAIL PROTECTED]
Sent: Tuesday, May 11, 2004 2:33 PM
To: [EMAIL
You cannot set a controls default value wihle the VI is running. Doing
this requires the VI to be recompiled, and that cannot be done while
the VI is running.
The easiest way to do what you want would be to read the controls
value as the VI shuts down and write it to a config file. Then when
the
I would like to do the following:
Have an xy graph with multiple plots. The plots are values over time.
The plots don't have sychronized or regular time updates which is why
I used an xy graph which works great.
I would like to have a vertical cursor that is free dragging that I
can move
Hello! I have a question of how to build correct labview structure. I
have a path control in my main vi and want to check if it is correct
in a sub vi. If not correct, ask the user for a correct one in the sub
vi. I see two different options of how to do it and I think no one is
realy good.
1.
Hi, I'm trying to control an F32 refrigeration/heating circulator
through LabView via an RS-232 cable but am having trouble. I keep
getting the error - 1073807246 at property node (arg1) in VISA
configure serial port. What does this error mean and how can I
correct it? I have already specified
Some other links to free W32 versions of the UNIX btouch/b
command:
a href=http://unxutils.sourceforge.net/GNU utilities for W32/a
a href=http://stevemiller.net/apps/Steve P. Miller's Win32 Console
ToolBox 1.0/a
I'm sure you'll find a few more if you do a quick web search.
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