Simple parallel port control

Hi, I am new in programing and what I need to do is to maintain 5V on 4(any 4, cause I can hook the wires to any pins I wanna to) of the 25 pins of the parallel port. and at specific time I need to press a button to let the voltage drop(a signal) to active the machine I am working on. Can any one give me a lift on what vi to use? I check the NI tutorial but it all talks about how to send and recieve 8 bits info over the parrallel port while what I really need is just a simple program to control 4 pins. I am using windows XP pro and labview 7.0
Can a computer learn how to program?

First of all read this arcticle about the Parallel Port
http://zone.ni.com/devzone/conceptd.nsf/webmain/72C6FC6CE4AD4D1386256B1800794596
After that downaload the Accesshw.zip which allows you to write and read from any computer's port under windows.
Now if you want lets's say to write to the 1st bit of the parallel port you have to put to the parallel's port data address the value 1. In order to leave the other bits unaffected you have to keep somewhere the state of the parallel port and use the following condition [state OR 2***bit_number] if you want to turn on (1) this number. On the other hand if you want to turn it of use [state AND NOT(2***bit_number)]
Please let me know if you need more information
There are 10 kind of persons. Those who understand binaries and the others.

Similar Messages

  • Simple parallel port question

    Dear everyone,
    I want to control some pins of the parallel port to be high voltage. So I read this NI webpage
    http://zone.ni.com/devzone/conceptd.nsf/webmain/72C6FC6CE4AD4D1386256B1800794596?opendocument&node=DZ52058_US
    I follow the instruction to connect pin 11 & 12 to ground and checked my LPT1 address is 378, but error message comes out when I run the program. Could you please help me to solve the problem
    thanks
    Attachments:
    2.JPG ‏73 KB

    It seems you are running windows XP.
    The old inPort and outPort VIs are not supported under Windows NT/2000/XP.
    You should upgrade to LabVIEW 7 (or higher) or follow the instructions HERE to install the accessHW utilities.
    LabVIEW Champion . Do more with less code and in less time .

  • Accessing Parallel Port Control and Status Registers with VISA and Win7x64

    Hello all,
    I've posted this in the I/O forum for VISA, but this main forum seems to get a lot more traffic so I'm posting here too.
    Wondering if anyone has a solution for accessing the Control and Status registers on a parallel port with VISA, now that Win7 has locked down the I/O ports and In Port.vi and Out Port.vi don't work anymore.  I've been looking all over for a solution and haven't found anything that will help; either the VISA solution is shown but doesn't mention if the Status and Control registers are accessible, or the solution is for a 32 bit system.
    The one thing I found was under Instrument I/O>VISA>VISA Advanced, there is a group of functions called Register Access; but, when I investigate that, it seems to need an address that the detailed help describes as "VXI, VME, and GPIB-VXI" or "PXI" with no mention of Parallel Port usage, so I'm pretty much at the end of what I can figure out.
    Basically what I need to do is use the data lines to send info, and watch the status lines for incoming discrete signals.  Since parallel ports are half duplex, I can't have the data lines be both inputs and outputs simultaneously, which is what I need.  A cheap D I/O card would be the easiest solution, but to make a long story short I'm dealing with a legacy system and that's something my higher-ups want to avoid.
    Any help is greatly appreciated!

    Hello,
    I was able to solve this problem using software from Entech Taiwan; it's called TVicPort and it's available for free for personal use, and very cheaply for commercial license.  If you have questions let me know, I'll do my best to answer them but investigate Entech's solution and see if it'll work for you:
    http://www.entechtaiwan.com/
    http://www.entechtaiwan.com/dev/port/index.shtm

  • Controlling the ouput of my parallel port to control a simple LED display

    I am trying to produce a running light (using 8 LEDs) from my parallel port. How should I start if I want to program using Java. Can I anyone give me a simple program to start with?

    I am trying to produce a running light (using 8 LEDs) from my parallel port. How should I start if I want to program using Java. Can I anyone give me a simple program to start with?

  • 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.

  • Anybody knows how to control parallel port to generate digital line ?

    All,
         I have found at some website, there are a software can generate corresponding signal (I suppose that is digital line) to driver a relay board, the relay board is 8 channels. which out put is pin 2, pin3, pin 4, pin5, pin 6, pin7, pin8 and pin 9 of parallel port to control it . it is well control, how can it do ?  and I want to simulate it at LV with parallel port too , how can it achieve ? which command, or a simple sample which you provide will be appreciated.
    thanks in advance.

    You forget to search through NI Web site. Here are some links.
    http://zone.ni.com/devzone/conceptd.nsf/webmain/72C6FC6CE4AD4D1386256B1800794596
    http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B123AE0CB9CB111EE034080020E74861
    Sergey

  • Could you help me to control a DC motor with the parallel port and windows 2000?

    I have labview 5.1 and i want to control my application throught the internet

    I would recommend upgrading to LabVIEW 7.0 for a couple of reasons. First, LabVIEW 6.1 introduced remote front panels which allows you to control a VI through a web browser. Setting up remote front panels is very simple and that alone is worth the upgrade. As far a using the parallel port you can use VISA to send/receive commands via the parellel port if you are using a motor controller with a parellel interface. If you are talking about using the port on a bit level to control the motor, LabVIEW 7.0 ships which an example of how to do basic digital input output with the parallel port.
    Regards,
    JR A.
    Application Engineer
    National Instruments

  • Control Parallel Port using Python!

    Hello, I've coded a new library for python which only purporse is to control the parallel port natively. It uses a C lib ported to python by me(although the C functions to handle this are really simple, all credits go to its original author Juan Gabriel del Cid Portillo) and what I like more about it in python is the interactive mode it offers! check sample code and more information at http://devpower.blogsite.org (in spanish).
    By the way, this is for linux only by now, windows is supported too but I don't have a windows system to compile it, if you want to you can compile it your self since the code for the C lib is included. I hope anyone can find this useful (say goodbye to pyparallel! no more Java deps!). Direct Download Link: http://devpower.blogsite.org/data/files … arport.zip
    Edgar Merino

    This is a frequently asked question. I'd dare say it probably gets asked once each month. You should look at this article:
    Using VISA to Access the Parallel Port in LabVIEW
    In a nutshell: You have to write/read by port. You cannot read/write by bit. This means that if you want to change the value of a single line you have to read the current value of the port, mask it to get the new value that has the line you want changed, and then write out the new value of the port.
    If you also do a search in this board, or on the NI site for "parallel port labview" you will find lots of hits.
    Message Edited by smercurio_fc on 04-09-2007 04:18 PM

  • Control parallel port (data and control lines)

    I need to control the output on the parallel port (LPT1) - Both data and control lines.  Once the data is written (Pins2-9), I then need to toggle the Sprocket signal (PIN1) - on the parallel port. The sprocket signal is also referred to as the Data Strobe Output.
    The required method is as follows:
    1. Lower the sprocket signal on PIN1
    2. Send the data (Pins2-9) and wait
    3. Raise the sprocket signal and wait.
    4. Repeat.
    I am looking for a method to control the data on LPT1 pins 2-9 and then be able to toggle PIN1 - Strobe signal - without the data falling from the other pins. What I have found is that whenever the state is changed on the strobe - the data that was written to Pin2-9 falls to zero. This will not work for my application - the strobe tells the hardware device that the data is ready. If it falls to zero when I toggle the strobe - that will not work.
    Regards,
    Guy

    Hello Adam,
    I am familiar with both references.  If you look more closely at the library reference - it allows me to communicate using VISA across the parallel port pins 2-9.  It does not permit direct communication to pin1 (the strobe signal) - property nodes don't allow the strobe to be refereced either (similar to control lines/signals for COM ports).
    Worse, I have also located examples using OUT PORT that does enable pin1 to be toggled.  The problem is, when those VIs are used, the data falls from the data pins when the strobe signal is written, even if its value is not changed.  For example, if the strobe is already high, if another high value is passed, the data falls from the data lines.  The other issue, when using VISA, as soon as the data is writen, the strobe signal automatically goes high even though I need a wait before setting the strobe high.  This is in complete contradiction to the second article you referenced which clearly discusses writing data to pins2-9 then taking the strobe high to indicate to the printer that new data is available.  It must be possible since this is the typical handshake.
    I am still looking for a more complete answer/solution.
    Regards,
    Guy

  • 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...

  • How to use the Control lines of a parallel port as Input lines to be read using Labview ?

    The details are :
    NI Software : LabVIEW
    Version : 5.0
    OS : Windows 95
    NI Hardware : N/A
    Drivers : N/A
    CPU : Pentium
    RAM : 48
    Vendor : darcom
    Customer Information :
    SPEL TESTING
    SPEL, INDIA
    [email protected]
    Ph: (91) 4114 53818
    We do not have any DAQ cards within the PC. We have the parallel port which is EPP and ECP compatible having the address 278h on LPT2 and we are trying use this port for reading 8bit data from an external circuit. We developed a vi program in Labview 5.0 to control the parallel port.We tried with the Data lines to send signals from PC to external device through this parallel port with the addr
    ess 278h (which
    is Data lines) and it works fine. We also tried using reading 4bit data from external
    device to PC through this port with the address 279h (which is Status lines) and it
    is also working fine.
    But it was not possible for us to read through Control lines whose address is 27Ah. Whereas when line printer (dot matrix printer) was
    connected, it was possible for us to take print out. Thus printer was working. This
    informed us that the control lines are all OK!
    Can you please clarify, how to use both control lines and status lines to read 8 bit data through this parallel port using the Labview software.

    There are several Knowledge Base entries about this on the NI site, but probably the most detailed document is on the Advanced Measurements (www.advmeas.com) website. Try looking at this page, I think you will find it useful.
    http://www.advmeas.com/goodies/parallelport.html

  • Controlling XY stage connected to parallel port using labview

    Hi,
    I have a XY stage which I can control using mach3 software. I want to control a signal generator, VNA and the XY stage at the same time. I have programmed SG and VNA using Labview but I am having difficulties controlling XY stage using Labview. I have never controlled an instrument connected through parallel port using labview.
    Can anybody give me some ideas to start with? How do I use VISA to control the parallel port? I really appreciate your help. Thank you in advance.

    Hi srms,
    Since your question is related to using VISA, I would try posting your question on the Instrument Control Board. You're likely to have better luck there.

  • Controlling pins on the parallel port

    Hey
    I'm writing a program in  labview to controll a matrix card with labview. For that I'll use the parallel port. On  the datasheet it says  that only one off the pins shall send data serial into the card, and others are pins for update. clk etc.
    So I need help on how to configure the parallel port to  send different  things to the dedicated pins.
    jonas

    Hi Jonas,
    your task is a typical  SPI - communication ( like it is used for many chips - A/D  or D/A- converters; µC's etc. )
    Find attached a SPI-example-program (LV7.1.1), ( 16 Bit in this case )  - there you will see the mechanism, how to
    serialize Data @ LPT - Port and how a clock and /CS signals are added.
    I think with all my comments inside the Diagram you should understand, how it works.
    Switch the yellow light bulb "ON" and step through the program in Debug mode - every single clock and
    Data change can be observed  .............. or use a scope in "loop mode".
    If there are still open questions - let me know.
    Regards
    Werner
    P.S. Next time you should first simply type "parallel port" or "SPI"  in search line.... on this forum you will
    find a lot of threads about this issue........
    Attachments:
    project xx SPI.zip ‏92 KB

  • 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

  • How to control a parallel port with labview

    Hi. I'm trying to control a dc motor with a parallel port using labview. the program has to be able to vary the out put voltage of the computer (0 - 5V) through the parallel port into a circuit which will step up the voltage for the motor. Any help would be greatly appreicated. garreth

    Do you want to output and varying signal from the parallel port pins? If so you can't do it, the port pins are digital and can only be high or low, not inbetween. You can control the individual lines high or low using the In/Out Port vis in Advanced>>Port I/O. For more help on doing this search the message archives (I know I've answered a few) and NI's site, there is some good info on it out there. Try some of these for starters:
    http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/0989d3d9dafae64e8625680400679736?OpenDocument
    http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/f4146c66990c46388625695f00726581?OpenDocument
    http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/f3c4ee6ee2c23ef386
    25646b007882c8?OpenDocument
    http://www.advmeas.com/goodies/parallelport.html
    I hope this helps get you started
    Brian

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