Read/Write Parallel port

I need to write to several different pins of the parallel port and then read back 2 different signals simultaneously. inp and outp do not seem to give me the capability to do this. Any help is appreciated

Hi Clayton,
That's NOT correct. The output pins of the parallel port are between 2(lsb) and 9(msb).
You cannot control pin 14 as ouput and I thnik you misunderstood the connection between the data (the second parameter to the outp function) you write and the pins effected.
The data byte is 8 bits and each bit correspond to a pin from 2 to 9. So writing 0x0D = "0000 1101" to the port will send a logic 1 to pins 9,7 and 6.
The attached drawing may help to clarify further.
I also recommend a little reading from the internet. You can start with: http://logix4u.net/Legacy_Ports/Parallel_Port/A_tutorial_on_Parallel_port_Interfacing.html
Hope this helps.
S. Eren BALCI
www.aselsan.com.tr
Attachments:
parallel.gif ‏6 KB

Similar Messages

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

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 from parallel port

I know it's possible to write some data to the parallel port using
LabVIEW, but I don'y know if it's possible to read from the parallel
port.
If someone knows, please advice.
Thanx for reading.
Paul
Sent via Deja.com http://www.deja.com/
Before you buy.

[email protected] wrote:
>I know it's possible to write some data to the parallel port using LabVIEW,
but I don't know if it's possible to read from the parallel port. If someone
knows, please advice.
Thanx for reading.
Paul
Yes, it is very easy to read from the parallel port. There have even been
some VIs floating around allowing you to use the parallel port for digital
I/O using the inport and outport VIs.
To just use it to communicate, just use the VISA VIs with the proper resource
name for the port you are using.
Bob Young - Test Engineer - Lapsed Certified LabVIEW Developer
DISTek Integration, Inc. - NI Alliance Member
mailto:[email protected]

Parallel port under linux

could anybody help a linux-labview beginner?
i'm trying to write to my parallel port. but labview is obviousely not set
up for this. does anywone happen to have a vi which can do that?
best of regards
michael h. fischer
============================================
cell: +43 664 1254415
fax: +34 664 1265930
icq: #61578912
vienna university
institute of geology
geochronology laboratories
althanstrasse 14 / 2a482
a - 1090 vienna (austria)
web: www.univie.ac.at/geologie/fischer/
wap: www.univie.ac.at/geochron/wap/
============================================

"michael h. fischer" writes:
> maybe i didn't comunicate here.
> i don't intend to print anything out but i want to set each pin of the port
> hi or low. i'm trying to turn some electrical relay-switches on and off.
>
> thanks anyway, all these hints are useful to me
Michael,
So using an true ASCII printer or dircetly /dev/lpx is the easiest
solution. Just "print" the ASCII charakter representing the bits to
set.
Johannes Nieß
>
> "Johannes Niess" wrote in message
> news:[email protected]..
> > "michael h. fischer" writes:
> >
> > > could anybody help a linux-labview beginner?
> > > i'm trying to write to my parallel port. bu
t labview is obviousely not
> set
> > > up for this. does anywone happen to have a vi which can do that?
> >
> > Michael,
> >
> > I'm not sure how you adress the parallel port.
> >
> > Writing directly to an I/O port is not allowed for security
> > reasons. There are VI's to do the required system calls.
> >
> > You might be able to use the (old) serial VI's with a high serial port
> > number. You can look up the port number on a LV version for Windows.
> >
> > I'd use a completely different strategy: VISA can address parallel
> > ports. With Windows you just use ASRL10. You might need some tweaking
> > of the VISA preferences files to do it.
> >
> > Printing data to a parallel port should be done with the tools
> > designed for it: System Exec: lpr file.txt
> >
> > Does someone have a summary of the options for reading the parallel
> > port and setting control lines via the described methods?
> >
> > Johannes Nieß

How can I do to communicate to parallel port using labview 5.0 and NT ?

I am trying to write and read from parallel port using Labview 5.0. It does not work with NT.
How can I do to communicate to parallel port using labview 5.0 and NT ?
Thank you in advance.
Regards,

If you are trying to use In/Out port functions that come with LabVIEW they will not work with NT. I think the AccessHW file at the following link will fix that problem:
http://zone.ni.com/devzone/explprog.nsf/6c163603265406328625682a006ed37d/49664743ded6f1da862564bc004e3a7f?OpenDocument
Try also this link:
http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/0989d3d9dafae64e8625680400679736?OpenDocument
and do some searchs at NI.com for parallel port, you should find some more usefull info.
Good luck
Brian

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 write a vi in using parallel port for digital inputs

Dear all,
i am a beginner user of LabVIEW and i want to write a vi in using parallel port for digital I/O. After reading the article "Using the Parallel Port in LabVIEW
" and download the parallel.zip, i know how to write the vi for output, but i still don't know how to write the input one.i've try to use a Inport.vi to test, but nothing change when i set pin2-9 to high. (my computer:win2K & LabVIEW 6.1)
Can anybody teach me how to write it?
Can anyone write the vi for me too?
Thanks all!
p.s.i've already install the "accessHW.exe"

Are you using VISA or the accessHW VIs? You may need to goto the bios and set the parallel port to run in spp mode or standard mode. This is the simpliest configuration and where you should start.
As far as writing the VI goes, just copy the diagram out of the tutorial you mentioned.

I want to write data into eeprom(93LC86) in parallel port using labview?

I want to write data into eeprom(93LC86) in parallel port using labview? Also I want to read data from EEprom.

Hi Mr. Mz,
after having a look to 93LC86-Datasheet I do not see a problem. The self-timing programming cycle of this Chip avoids timing problems; the rest is only logical stuff.
If you need more general info, how to use the parallel port, I recommend: http://[email protected]/ or
in case you need an example of SPI-Interface in LabVIEW with paraport - then write to: [email protected]
You are welcome
regards
wha

RE: Write to Parallel port

First you have to change the labview.ini file and add the line:
serialDevices="COM1;COM2;COM3;COM4;COM5;COM6;
COM7;COM8;COM9;LPT1;LPT2;LPT3;LPT4;"
Then you can use the LabVIEW Serial Port Write.vi using port number 10,
and it will send a string to the parallel port. But, if you have not
yet modified your "labview.ini" file, you may receive an error -37.
I haven't use this method yet, so if it works, please email me.
Paul
[email protected]
Sent via Deja.com http://www.deja.com/
Before you buy.

Hallo, palma,
Du (x) meintest am 14.08.01 zum Thema RE: Write to Parallel port:
> I would like to know where can i found the IV
> of Labview: "write to parallel port.vi".
> I found it in "parallel 8-bit digital output
> port" but when I try to open it appear this:
Which OS do you use? Windows NT and Windows 2000 don't like direct port
access. For these OSs you need a special file from the NI website
("hwaccess.xxx" oder "accesshw.xxx").
Greetings!
Helmut
Please excuse my gerlish!

UDP Parallel Read/Write

I have an application where I am trying to receive and transmit data using UDP on the same port. Ideally, I'd like to have this functionality separated out into separate loops so that sending out data is not dependent on receiving data and vice versa. The code I have written works fine on my RT system (cRIO VXWorks) and is able to execute these task in parallel but fails on my Windows XP machine. I have attached a highly simplified version to illustrate the issue.
On the Windows machine, the UDP Read VI will terminate execution (even with a timeout of -1) if the UDP write VI is called and return error 66. On my RT system, the UDP Read VI will continue to wait until it receives data (as expected), even if the UDP write VI is called. Is this expected? Anyway to get the code to execute the same way on my Windows machine?
Thanks,
Damien
PS. I've tried it on both LabVIEW 8.6.1 and 2011.
Attachments:
UDP Parallel Read Write.vi ‏14 KB

Hey Guys,
In case any of you are interested or if anyone else is experiencing the same issue, I finally had an oppurtunity to dig into this issue a little deeper. The issue is more basic than just trying to read and write data in parallel using the UDP primitives. See attached VI, run with highlight execution.
The attached VI represent a client application which uses "UDP write" to send a message to a server and "UDP read" to read a response from that server (it is actuallu a slightly modified version of a NI example). Now, lets say the server goes down and the client is still trying to communicate. The client should still send out its message using the "UDP write". This operation does not return an error since UDP is connectionless and it doesn't care if anyone is listening. The next function, UDP read, should wait for the full timeout and then return error 56. However, if you run the code, you will see that it does not wait for the full timeout but rather it immediately returns errror 66. This is the cause of the bug. I have confirmed that LabVIEW running on a realtime system (VXworks) and running on MacOS does not exhibit this behaviour but rather both function properly, returning error 56 only after waiting for the full timeout period. This bug is what causes my original code to error out even though a -1 is wired to the timeout of the UDP read (it just happens to be in parallel with the UDP write). There is something wrong with the UDP read function on Windows system. NI support has acknowledged this error on Windows systems and they are filling a corrective action request. I'll post that number once I get it.
(Just for fun, disable the write operation and watch that the read function will wait for the timeout?)
Attachments:
UDP Client_2 0.vi ‏12 KB

Reading Ascii charactors from Parallel port???

Greetings:
I have a question about instructing a third party vender who is writing code in VB6.0. (windows XP sp2)
They will be sending cycle counts thru the parallel port to my computer that i will be capturing using Labview 7.1.1 (windows XP sp2)
The format of the streaming will be Ex. *000000324*000000325*000000326*... etc. Continuously
I can tell him to get rid of leading zeros if need be.
I think i can capture this using VISA serial read.
a) But what should i tell the third party vender for him to write to the parallel port? Also should set the printer port to RAW
and/or bi-directional printing .
b) What is the pinout of the parallel cable between the two computers , is there a Null modem type of cable available, or is it pin to pin?
c) What about handshaking , such as printer not ready, buffer full, etc.etc.
Any help would be apreciated.
Thanks
Forrest
[email protected]
to modify thier software to a
Parallel port. so that i could capture.
I have a third party group that is running a process sending and receiving
data
> thru a USB port for control of a frequency test. They are keeping track of
> cycle counts that
> are important in there test. They are using Visual Basic 6.0.
>
> What I want to do is to send the cycle counts ( which could be up to
> 999,999,999 cycles)
> (on an older system I would capture the cycle counts from a RS232 port
that
> they were send to me on another computer[Running Labview 7.1.1])
>
> I need ( since RS232 ports are sort of going away on new computer system
> nowadays) to capture a streaming cycle count from the third Party system.
> etc which will be continuous. They can modify there Visual Basic 6.0 to
> incorporate USB drivers for your chips. I will be capturing the Data
either
> RS232 or USB into Labview 7.1.1 .
>
> I noticed you had drives on your web site with VB and Labview.
>
> Could you guys give me some suggestions if possible.
> Thanks
>
>

Hi Forrest,
Okay... that makes more sense. You are trying to communicate beetween 2 PC's. Something like LapLink.. And yes, it would be okay to do this with the parallel port, it may have more speed than the serial port. However for ease of implementation, you can use the serial port communication. It is actually quite easy to implement.
The first step (if you are using Windows), is to establish the communication between the PC's using Hyperterminal. You should be able to "chat" between the 2 PC's. Maybe I shouldn't use the word chat.. You can communicate (Tx/Rx - ASCII) between the 2 PC's. Once you verify that this works (at the desired speed - and configuration), you can implement it in Labview.
RayR

Urgent!!! Need help in file read/write data to a serial port

Hi,
I really need someone's help in order for me to complete my project. I have attached a vi which I have taken from an example and integrate to my project. In the vi, I have managed to get the encoder counts using Ni 9411. I need to read/write that data from ni9411 to ni9870 without using any serial port as they are connected to a NI 9104 chasis. May I know whether I am correct in writing the data to my ni9870 port using the vi I have attached? Does anyone know how i can convert the number of counts to a 8-bit data/byte so that I can send the data through the RS232 port? I really need someone's help as I need to finished in 2 weeks time.
I have also attached an vi on controlling the epos2 controller using instrument driver. Does anyone know how can i integrate this vi to the fpga vi (the one which I need to read/write data to 9870) as I need to send those data to control my epos2 controller.
Please help me!!!
Attachments:
Encoder Position & Velocity (FPGA).vi ‏23 KB
SINGLEMOTORMODIFIED.vi ‏17 KB

Afai,
As I allready suggested you here, call your local NI Office and ask for assistance!
You really need assistence in a higher level that we can provide via the forums. Otherwise I don't see a chance for you to finish your project in time.
1. Convert I32 to U8 to write it to the 9870 could be done like this:
2. The vi to control the epos2.
There is NO way ( absolutely NO way) to port this vi to FPGA. It's based on VISA calls, uses an event-structure, both are not available at the FPGA.
The only thing you could do is to analyze the VI, the instruction set and design an FPGA vi which handles the specific instructions you would need.
I have no experience with epos2 and I'm not 100% sure if this would work as you would like to use it. And doing this needs deep knowledge of LabVIEW, VISA, Instrument Drivers, the epos hardware, FPGA programming, and so on...
Christian

How can I write to port C and read from port A&B simultaneously using 6503 DIO-24

I attempting to read from Port A and B which are grouped together and at the same time I want to write to Port C. The problem I having now is that every time I want to read from Port A and B, Port C seems to be effected. I have only used the easy dio's vi this may be the root of my prblem

Hello,
You will need to use the advanced digital VIs to accomplish what you are trying to do.
The Easy DIO VI's are simply a combination of two DIO advanced VI, so you will use the same two advanced VI with a little different calling method. We want to call both PORT Config VI first to configure two ports for read and one port for write. Then we can simply read and write to the ports as desired, perhaps in a loop.
The best place to start would be to look at the LabVIEW examples for Digital Input and Output operations. In LabVIEW, go to Search Examples then under I/O interfaces select DAQ (or Data Acquisition)-> Digital Input and Output->Immediate Digital Input and Output. From her you will want to look at the examples under the 8255 chip which is the chip on
the DIO-24. I would recommend looking at Read from two digtial ports and the Write to one digital port VI's.
From here you will simply need to combine the two together. One note: you will want to make sure that both port config VI are called before either Port Read or Port Write VIs.

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 .

Read/Write Parallel port

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