I'd like to Pilot Parallel Port an its seperate bits

Hi...
I'd like to pilot 8 relays with the normal parallel-port of a PC using LabView. In this case I have to pilot 9 bits of the parallel port. How can I realise to pilot the parallel port and the seperate bits and which VI should be used?
Message Edited by Sushi on 05-16-2006 11:05 AM
Message Edited by Sushi on 05-16-2006 11:05 AM

Hi Sushi,
The first thing to investigate is whether the PC's parallel port can actually drive that many relays due to loading conditions. Check out the specs of your PC's bus versus the loading requirements (typically mA) for a given relay.
As for controlling the relay using the parallel port, you can have a look at the example provided by Labview by searching within the Help menu, under "Find Examples", then search "parallel port". Although reading & writing to the parallel port is relatively easy, the nice thing with the examples is that it provides information on each line of the port (data vs control, etc). I also posted an attachment a few years ago on how to set up the port. This was used to open / close relays.. I will look for the thread.
Regards,
JLV

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hi ,
I met the same problem this morning, and searched the www.google.com in order to solve it, as a result, your article was shown on my screen. :)
Till now I have read some technical information and solved my problems. Maybe the solution be useful to you:
==============================
error message : (Environment : Tomcat 5, Windows 2003, Mysql5)
2006-3-29 11:53:48 org.apache.catalina.core.StandardWrapper unload
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==============================
cause: the number of connection to database exceeded.another word,too many connections.
==============================
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==============================
ps. Sorry for my weak English . hehe ....

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View Solution.

Hi khalidem,
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http://en.wikipedia.org/wiki/Parallel_port
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StartJob: filterfds[0] = [ 10 11 ]
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[Job 16] /usr/lib/cups/filter/foomatic-rip: No such file or directory
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[Job 16] ppd->num_fonts = 35
[snip]
[Job 16] ppd->fonts[8] = Courier
[Job 16] Page = 612x792; 0,0 to 612,792
[Job 16] slowcollate=0, slowduplex=0, sloworder=0
[Job 16] 0 %%BoundingBox: 0 0 612 792
[Job 16] 0 %%Creator: texttops/CUPS v1.1.20
[Job 16] 0 %%CreationDate: Thu Mar 18 18:13:15 2004
[Job 16] 0 %%Title: fstab
[Job 16] 0 %%For: root
[Job 16] 0 %%Pages: (atend)
[Job 16] 0 %%DocumentNeededResources: font Courier-Bold
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[Job 16] 0 %%DocumentSuppliedResources: procset texttops 1.1 0
[Job 16] 0 %%+ font Courier-Bold
[Job 16] 0 %%+ font Courier
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[Job 16] 0 %%BeginProlog
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[Job 16] 0 %%CreationDate: Wed Dec 22 1999
[Job 16] 0 %%EndResource
[Job 16] 0 %%BeginResource: font Courier
[Job 16] 0 %%CreationDate: Wed Dec 22 1999
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[Job 16] PageTop = 792.0, PageBottom = 0.0
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[Job 16] Saw EOF!
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Is it possible to access the parallel port in network computer using labview?
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ramkis wrote:
Is it possible to access the parallel port in network computer using labview?
because i am having laptop i dont have parallel port in it. If i connect my computer to network is it posible to access the parallel port in network computer.
Define "possible". Lots of people ask if something is possible. What you really want to ask is "how difficult is it"? The answer is "yes, it's possible". How difficult? VERY. You cannot directly access it. You have to set up a messaging system between the two computers. Feel like doing that?
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Perhaps a more complete model number would help. In looking with that limited model number there are several listed, even an AIO unit. In the models such as the small form factor model, there is no parallel port ( which is normally LPT ) shown. What actual output port is being addressed as the LPT?
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Please click "Accept As Solution" if my help has solved your problem. ----------}
This is a user supported forum. I am a volunteer and I do not work for HP.

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Hi all,
I know people have had this question before, but I don't seem to follow the responses.
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NI Services
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Hello all
I am having usb to 36 pin parallel port converter and i try to communicate with that to run a stepper motor.
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Hi,
First I would like to apologize for my English. I'm from Switzerland....
I'm trying to read out a 16Bit A/D in 1us steps. Serial Communication over a PIC is too slow, so I was looking for a faster option. I found out there is possibility to read from the parallel port:
I downloaded and installed the AccessHW drivers. I found 2 Vi's (see attached files) to read and write to the port. But this works only very slow. (100Hz read frequency).
By the way I need some advice how to use 16 bits in minimum as inputs. When I set the bit 5 in Baseregister+2 I can read the Baseregister. I can read the whole byte except bit 3. This bit stays always high (3.4 VDC).
The 5 status bits from Baseregister+1 I can
read with no problems but the read frequency is around 100Hz too...
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Hope there is anyone who can help me..!
Greets
Attachments:
Input_Byte_From_Port.vi ‏20 KB
Output_Byte_To_Port.vi ‏12 KB

If you're trying to acquire a 16-bit sample at 1MS/s, using the parallel port, it will not work. In fact, many full-fledged DAQ cards do not support this high sampling-rate/resolution combination. Look at what NI has available here, in the S and E series DAQ boards--this should give you a feel for what's out there and what a professionally manufactured piece of equipment is capable of:
http://sine.ni.com/apps/we/nioc.vp?cid=10955〈=US
http://sine.ni.com/apps/we/nioc.vp?cid=1038〈=US
As you noted already, a parellel port is going to be extremely slow for your needs, and likely not only be slow, but also have a pretty fair amount of timing jitter, since the timing of your read calls will be indeterminate. I would definitely recommend you look into som
e other hardware acquisition option besides your parallel port... it won't get you very far unfortunately, because that isn't what it's really designed for.

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.

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I am a new user of Labview and have very little experience. I am trying
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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
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Message Edité par Conseils le 07-13-2006 09:17 PM

I'd like to Pilot Parallel Port an its seperate bits

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