Read the parallel port

Hello,
I am working with LabView 7.0 and with Windows 98. I want to read the
parallel port, but I don't get it. I am using the I Saw In port.Vi but
I don´t read anything, but however with the function Out Port.vi if
that get
to write in the port. Is somebody able to throw a hand?
Thank you

Hi,
Hope this gives some light to your problem:
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/c80752c53094c296862565f3007ac765?O...
Regards,
Jaime Cabrera
Ni Applications Engineering Spain
Regards,
Jaime Cabrera
NI Applications Engineering Spain

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Can we read the status of a particular pin in the Parallel port(LPT1)?

Hi,
I have a Camera.I'm trying to read the status of the camera by connecting it to the parallel port.The camera has a DB26 ,high-density I/O connector .A high level on pin 19 indicates that the camera power is switched on(+5v =on ,0v=off).I want to read the status of this pin by connecting it to the parallel port.Can i read the status of a particular pin in parallel port thru LABVIEW? if so how ? Any help in this regard is appreciated.

Rajesh,
You may find the following tutorial useful:
http://zone.ni.com/devzone/conceptd.nsf/webmain/72C6FC6CE4AD4D1386256B1800794596?opendocument&node=DZ52058_US
Regards,
Khalid

How can I write to the parallel port using LabVIEW 6.0.2

I have tried updating the labview.ini file and also using the parallel.llb available on the site. When I execute the program it gives me error 37 saying,"device not found". I am running this code on windows 98. I tried to use VISA write,serial port write (using port 10) but nothing seems to work. I also tried to develop a sample code using inPort and outPort, but no success, it is not able to read the data back from the parallel port, even if it seems (????i don't know any way to cross-check it though????) to write.
Does anybody know the problem here?
THanks.
Pari.

Thanks Brian.
Well here is the next problem. I got a VI (attatched) off ni.com and it works fine on a windows98 platform. But quits working on NT.
I can write perfectly (which i checked by hooking an LED display unit at the other end of the parallel port cable). I observed that the LEDs respond to the toggling of individual bits (data bits). But the error occures at the "out port.vi", when I try to run it on a NT machine (where I actually wanna use it). Are you aware of any changes to be made in order to run a VI on NT that works on 98?
Thanks again.
Pari.
Attachments:
parallelPortSwitcher.vi ‏124 KB

How can i us the parallel port of the printer to control a frequenz-generator?

Hello all !
I like to control with LabVIEW 8 student-version, the Frequenz-generator gadget . For this challenge i like to us the parallel port of the printer. I need for data flow only 2 cable. The frequenz-generator gadget need two signal : Low and High.How can i us the parallel port of the printer to control a frequenz-generator gadget? I have us the VIs-Visa (Visa-Serial, write, Close ), but i dont no what command i have to write on the Visa-Write so that the Signal can be in the low or high position.
Thanks

Hi Jeanjac,
first, look here:
http://en.wikipedia.org/wiki/Parallel_port
to get the port numbering. also, be sure not to leave pin unconected, sometimes you might get an error message otherwise (i remember pin11 has to be always connected or so for windows...)
second, just run the test panel in MAX and write something to your device to check if it works.
then in LV, you have to decide to which pin is connected your instrument. in any case you have to address all 8 output pins together! this is a parallel...
if you prefere to use only one pin, then you can use the serial port, with just pin 2 and 3 connected. it would work easier for you, since you address only one bit.
Gabriel
... And here's where I keep assorted lengths of wires...

Why does this loop used to write values to the parallel port keep going forever?

Have a look at this VI guys. I'm trying to send a sequence of bits (used to trigger an IC). I'm interested in the last bit of the data port (D0). so I'm sending either 0 or 1 to that pin to trigger the IC. it works, but the problem is that the loop keeps going forever and i cant control it. if i send 3 to the loop count, I'm expecting to get: 1 0 1 0 1 0, but it doesnt stop and keeps going forever.
It seems that the problem is not with the loop. because i deleted the loop and just left the flat sequence so that it executes only once, but still it keeps repeating. How can i make the flat sequence execute only once?
I'm using a parallel port monitor (parmon.exe) and a LED connected to D0 of the parallel port to check.
If anybody has an alternative or better method to send the bits to the parallel port, I'd be very thankful.Message Edited by krayzie on 05-14-2005 04:33 PM
Attachments:
pport.vi ‏24 KB

It works just fine here. Place an indicator to the iteration terminal [i] to watch how things progress. Do the number ever increase above N-1 to what you wire to N? I don't think so!
Also make sure you don't run the VI with the "Continuous run" button. In this case the VI would immediately restart whenever it is finished. use the "Run" button.
LabVIEW Champion . Do more with less code and in less time .

Errors with the parallel port

I am trying to communicate with a robotic arm which is attached to the parallel port.

and... ?
See:
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=205&HUSERSHADE=0&HOID=5065000000110000006D070000&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0
2006 Ultimate LabVIEW G-eek.

How can I use the parallel port as an input channel to communicate with a SPECTROMETER?

Hello,
The sensing system we use is called: FieldSpec Pro from www.asdi.com.
The spectrometer has a LPT terminal. I'd like to use LabVIEW to acquire signals from the spectrometer for further analysis.
Thank you!

Dennis,
I appreciate your time.
I have asked the copmany for such infos, but it seems to be confidential.
Do I need an I/O DAQ-Card?
Dennis Knutson wrote:
About all that tells me is
that I'm located in the same town as the manufacturer. You'll need to
find some specification that describes the parallel port protocol.
Without that, you're just wasting your time. Even if the instrument is
constantly sending data, you'll need to know how to interpret the data
and there's nothing that says it has to be sending constantly. Maybe
you first have to write something to the port first. Talk to them and
tell them you want to replace their software with software of your own
and need to be able to read the data.

Writing a String to the Parallel Port

I am a new user of Labview and have very little experience. I am trying
to write an arbitrary string (that I can input) to the parallel port.
Basically, I need to communicate with a device that connects to it and
will accept commands as plain strings. I have read the article "using
the parallel port with labview" but it hasn't helped me as I am so
inexperienced. I was hoping that someone could help to learn how to do
this and if there's a vi that already does this. It seems like a simple
enough task. Thanks.

Rather than simply present an answer from which you will learn little, I will try and out line what it is that you should investigate......
First have a look at a string control
You might want a button and a case structure to tell the code when to start decoding the string
Put the following code inside the case structure say on the true state
Then, taking data from this string control get the strings length
Then using this and a loop index through the string using the string subset VI on the string pallette, use the length of 1 and index the position in the loop
Now figure out how to convert the character to an ASCII value
Send this to the parallel port
This should be a reasonable frame work to empower you to learn for yourself.
"Give a man a fish and you feed him for a day, teach a man to fish and you feed him for life", enjoy the free meals!
Message Edité par Conseils le 07-13-2006 09:17 PM

Using stand alone executables to send data to the parallel port

I have a executable that uses the parallel port to activate an alarm. The program works well on the base machine which is running windows XP. However when I try to run the stand alone executable on a windows NT machine there is nothing sent to the parallel port. I have updated the Cvirt file on all machines. I don't get any error messages when running the stand alone executable.

I have the same situation using parallel port to control a hot swap PCI extender card and no error showed. I can turn on/off and read correct voltages from the card in base machine. After creating executables, I can turn on/off the card, but got wrong voltages in target machine.
I've installed AccessHW in both machines and copied AccessHW.dll and cvirte.dll to system32 folder and the folder same with executables. I also tried installer with port support and serial support checked.
Windows XP is in both machines and LV 7 in base machine. I use "Output Byte to Port.vi" and "Input Byte from Port.vi" in AccessHW lib.
One thing I observe is initiation. The card manufacturer provides a program with same functions. After running their program, the voltage readings from the executables become correct. The readings remain good after closing their program. I close the executables and run the executables again and still see good results unless restarting the target machine.
Any solution for the problem? Thanks in advance!

Is it possible to control the parallel port with Lookout 5.0

I want a simple demo setup on a PC, so I can control the 8 data bits of the parallel port. Example, to use START p/b that would toggle bit 0 and data returned on bit 1.

It is possible to send bytes to the parallel port using the ASCII object within Lookout. However, it is presently not possible to control the state of the individual bits on the parallel port with Lookout.
If you need to control the individual bits on a parallel port, consider using LabVIEW. It is much more powerful when programming serial and parallel ports.

Programming the parallel port

Hi. I need to send some bytes to the parallel port. I don't want to print any documents. I found a method called public static void setOut( PrintStream out ). Can I use this method? And if so, how do I do it? What PrintStream sould I use? Thank You!

Interesting...
http://mindprod.com/jgloss/parallelport.html
Well, I'm not sure if that's really true (not that I don't trust that site, it has lots of good info)... My impression was (I've only used serial ports with it before) that since ParallelPort extends CommPort, that it would at least work by using it's CommPort's methods and that the ParallelPort stuff (which is all printer related) was just there for convenience, since most of the time it is a printer there.
Well, the OP could try it, I guess, but if not, then JNI is the only hope... or another parallel port package if one was ever written.

Problems accessing the parallel port

Dear All,
I'm having problems to access to the parallel port using the VI write /
read to the serial port, it returns the error code 37. As far as I've
seen in the documentation this error code is for UNIX systems and we're
using Windows 95.
Anybody know what's going on?
Cheers,
Ernest
Ernest Mendoza
Institut de Ciencia de Materials de Barcelona
Consejo Superior de Investigaciones Cientificas
Campus de la UAB. E-08193 Bellaterra (Barcelona)
Tel- 34- 93 580 18 53
Fax- 34- 93 580 57 29
http://www.icmab.es/dmag/new/index.html

This is the device not found error. It is platform independant. It means
that you are addressing a serial port that LabVIEW cannot find. This is
becuase the port is not there or LabVIEW cannot access it. Make sure the
serial port you are addressing is configured in Windows device manager and
then make sure you have the file serpdrv in your LabVIEW (or compiled executable)
directory.
-Jim
Ernest Mendoza wrote:
>Dear All,>>I'm having problems to access to the parallel port using the
VI write />read to the serial port, it returns the error code 37. As far
as I've>seen in the documentation this error code is for UNIX systems and
we're>using Windows 95.>>Anybody know what's going on?>>Cheers,>>Ernest>>>-->____________________________________________
_______>>Ernest
Mendoza>Institut de Ciencia de Materials de Barcelona>Consejo Superior de
Investigaciones Cientificas>Campus de la UAB. E-08193 Bellaterra (Barcelona)>Tel-
34- 93 580 18 53>Fax- 34- 93 580 57 29>http://www.icmab.es/dmag/new/index.html>___________________________________________________>>

How can i use the parallel port

I was wondering how to adress my PC´s
parallel port. I did'nt find a suitable
VI in the palettes.
Do I have to read/write somehow directly
to the port adress in memory 0378 ...?
If so, how can this be done ?
Thanks for any help,
Holsch

Use VISA to read/write to the parallel port just like you would read/write
to the serial port. I would staty away from the inport/outport stuff. I believe
there's some articles in the KnowledgeBase if you get stuck.
[email protected] (Helmut Hullen) wrote:
>Hallo, Holger,>>Du meintest am 29.07.00 zum Thema how can i use the parallel
port>> I was wondering how to adress my PC's>> parallel port. I did'nt
find a suitable>> VI in the palettes.>>Look at "in port" and "out port".>Under
Windows NT/Windows 2000 you need a special library for direct port >access,
look for "hwaccess" or "accesshw".>>Viele Gruesse!>Helmut>

Format of the parallel port base address

Just wondering if someone could please help with what I'm sure is a simple question
I'm currently trying the control the first 3 bits of the parallel port using the Out Port sub vi.
Using the Labview examples and help I can see how to find the base address of the port. My LPT1 port is 378 like most.
However the parallel port I'm trying to control is a added in extra PCI card and looking in the Device Manager this is LPT3 with 2 an address ranges starting at CF00 and CE00 . I understand how the address range of starting at 0378 becomes 378 for the base address. But whatabout CF00 asnd 2 ranges? What do I need to put as the base address for the Out Port for CF00?
thanks in advance
Nick

duplicate post. why did you feel the need to repeat the question, especially since it has already been answered.

Problems Reading/Writing Parallel Port Data, Status & control Registers Using In Port.vi and Out port.vi

Hi,
Can anyone there help me Please with the problem. I am trying to
communicate with the parallel port using my program which i have
attached to the message. I am running LabVIEW 7.0 Professional with
application builder. All the program does is reads and writes to the
three parallel port registers. It runs FINE!!! in my computer. But when
i built an executable (see attached) and tried running on a different
computer (with LabVIEW Runtime engine 7.0 installed) the program does
not read/write to the registers. The target PC had the parallel port in
SPP mode just like mine. I can't seem to understand whats going wrong?
Can anyone please help me if you know the right answer.
Thanks
Attachments:
Programs.zip ‏119 KB

Hi Guys,
I too have a problem using "Out Port.vi", but of a diferent kind. I use this VI to control the Parallel Port which in turn controls a small circuit. I use only two data pins, DP-2 and DP-4 for this purpouse. I use LV 7.1 Professional Development version in a Windows 2000 operating system. Now, my main problem is that my code runs fine (both is development and .exe forms) in my development computer, but when I try to run the .exe version in other computers (Windows XP operating system), it asks for a "protocol file" while starting (look at the attached picture).
Now, I really have no idea what kind of a protocol file it asks for and just click "ok" and proceed to work, the most interesting part is that the code works well as I expected. So, my only problem is that it asks for a protocl file which I want to avoid. As with the application building, I do all that is required like including the sub VIs (self developed), creating an installer, enabling the port access, and creating a proper .ini fine. I also use the Out Port.vi from the AccessHW library.
I have my doubts on two fronts,
1) With the version conflict, since my development computer runs with Windows 2000 and my target computers all run with Windows XP
2) With the Out Port.vi which further contains a small VI "Output Word to Port.vi" in it and that further contains Call Library Function Node, which might call soem external files, like what my problem is.(look at the attached picture)
I don't have answers to these questions and may be my problem is in different place, but I would like to hear from anyone who could give me a helping hand. I am in a situation where I could not disclose my code.
Thanks in advance,
mohan
Attachments:
protocol file.zip ‏153 KB

Read the parallel port

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