Parallel port sample rate

Hi,
I`m desperately in need of your help.
For my school project, I`m trying to write a labview code in order to acquire air pressure data by using 8-bit analog digital converter via parallel port. Although my signal frequency very low -100 Hz-I think I experience sampling rate problem. I want to put sample rate and frequency data in my code but how can I put it in my code?I `m giving square waveform via function generator which I need to see it on my graph in Labview. But there is something wrong in my signal in waveform chart. You can see screenshot and code attached. . Also there are some noises and amplitude is not stable . How can I fix this?
Would you please have a look at to my code and tell me how can I set sample rate and frequency?
Attachments:
CAN1.VI ‏21 KB

Hi LW-s
There isn't really a way to set the sampling rate for these VIs. You will have to use software timing. The only way to do this is with 'wait' functions inside your loop. You can also implement some logic to smooth/adjust your waveforms. For a square wave the logic is pretty simple. If the input value is above a threshold store it as the max and if it is below the threshold store it as the min. (See the example below). For sine waves this is a bit more difficult and if I were you I would probably try to implement some sort of averaging.
Best Regards,
Chris J
Message Edited by ChrisJ on 08-23-2005 05:31 PM
Attachments:
example.JPG ‏86 KB

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Parallel acquire 2 signals with different sampling rate on 2 cards

Hi NI,
I have cDAQ-9178 and NI 9221, where sample rate is 10kHz and NI 9219, where I need sample rate about 10Hz, it's possible this confiruration for parallel acquire?
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Hi Neolker,
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[WinXP/LabView7.0]Reading parallel port is too slow...

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).
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Attachments:
Input_Byte_From_Port.vi ‏20 KB
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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.

Can digital I/O lines emulate a parallel port?

BACKGROUND:
I am writing a VI that needs to sample multiple analog channels at high speeds (~2 msec) while simultaneously receiving byte-sized codes transmitted from a second computer (from either it's serial port or parallel port). These other posts of mine might help you get a better idea of what I'm doing:
http://exchange.ni.com/servlet/Redirect?id=1052290
http://exchange.ni.com/servlet/Redirect?id=1057299
THE PROBLEM:
I need a way to receive these codes at the same high sample rate that the analog channels are being sampled with, and they need to be on the same timing signal (so I know when the codes arrived relative to the analog data). Thus I can't use the built in serial or parallel ports, since the timing would
be inaccurate at such high speeds.
MY QUESTION:
Is there an established way to make the digital I/O lines on a NI daq board receive codes from a serial or parallel port? I am using a PCI-6033e, so if I can just use the digital I/O lines on that board, that would be ideal. However, I would also be willing to buy a sepparate digital I/O board that could be linked (for timing purposes) via an RTSI bus, and use that to receive the bytes from the second computer.
Any ideas for a software or hardware solution to this problem?
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Thanks, Filipe. That's pretty much what I expected as far as the PCI-6033 card was concerned.
However, one thing I failed to mention was that the host computer can only use its standard built-in serial or parallel port, not an NI DIO card (the signals are coming from antequated software that can't realistically be ported to use an NI card).
So...is there a way to take a parallel-port signal from the host computer and have an NI DIO card on the client computer receive it? (Presumably after passing through some sort of adapter, if necessary.) If so, what sort of DIO card should I look at?
Thanks again,
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Separate sampling rate for two different channels for a USB-6009 daq

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I am using a USB-6009 and incorporating the 'daq assistant' to change the sample rate. I am trying to find a way to set the sampling rate to two unique values for two separate channels. I've tried setting up two daq assistants and adjusting the sample rate different for each channel, though this does not work. Is there any way to set the sample rate high for all channels then reduce the rate for a different channel - or an alternative? I would appreciate any input on this, thank you!
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Solved!
Go to Solution.

All tasks on a DAQ board that use a sampling clock must use the same clock. Therefore, you cannot have two tasks on the same DAQ board sample at different rates.
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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?
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Pari.
Attachments:
parallelPortSwitcher.vi ‏124 KB

Digital sample rate

Is there a way to set the sampling rate for digital inputs?
In am using an 6032E Daq board. I use two VI's: Port Config and Port Read, but there I cannot set the sampling rate.
The only thing I found with rate is for handshaking.
I still have an other question then: in the same VI, I want to read from an Analog input and from a Digital input. I already wrote that VI, and it runs, but is there something I must consider when reading from both analog and digital inputs at a time?

You cannot set a sampling rate for digital operations on an E-eries DAQ board. The port is static, meaning that there is no timing circuitry controlling the port. It is updated or read by software command only.
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Audition 3 seeing a different sample rate setting than what the device shows

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DaleChamberlain wrote: Anyone know of how I can change these settings to get Audition to agree with the device settings?
I'm afraid that life is nowhere near that simple. The main issue here is that Audition, in common with most audio software, uses a driver system called ASIO to talk to the sound device - this cuts out a lot of the OS and reduces the latency of the system considerably. There are several problems with ASIO though - the first being that it only supports a single device per system (or sometimes multiple identical devices if the manufacturer can make them look like a single device), and with software designed to use this driver, then to use any other driver (like a native Windows one) you have to use a converter stage like ASIO4ALL. This will convert the ASIO streams to WDM, and let you use multiple sound devices - but with increased latency.
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So what the line input properties tab is saying is, if you have a non-ASIO driver designed to support all potential rates, possible. You don't have an ASIO driver available, because it's a built-in sound device, and anyway you've already pointed out that it's using the Audition Windows driver (a cut-down version of ASIO4ALL, effectively), so a conversion is already taking place. What Realtek refer to as 'High Definition Audio' is no such thing - all on-board sound devices of this nature are of universally low quality, and to improve this you'd need an external device - of which there are many available, usually with dedicated ASIO drivers. But none of them will work with ASIO beyond 96k, simply because the standard doesn't support any higher rates.
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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.
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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
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How to enable parallel port DC5800

This PC has header pins on the motherboard for a parallel port and I have connected a header cable but linux does not recognise that the computer has any parallel port hardware. There also seems to be no way to enable or disable the parallel port in the BIOS although it does have a setting for the printer port mode. The parallel support is described as "optional" on this PC, is it possible that the port cannot be enabled on this model?
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869578 wrote:
Could you give me a sample query using by the above example query?
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Parallel Port Help. Please

Dear friends,
Am developing an application that is to use the javax.comm package under a Linux (Fedora Core 5) system. However am quite stuck when it comes to sending a signal to a specific 'wire' off the parallel port.
I have read about the configuration of the parport that is in such a way:
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package controllers;
import javax.comm.*;
import java.io.IOException;
import java.util.*;
import java.io.OutputStream;
import java.io.InputStream;
* This class forms the base of all communication port events
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        this.portID = null;
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After much googling and searching all over the web, I found out that package javax.comm is just redundant and, for a lack of more appropriate word, useless. The same goes for package rxtx. However, I came across something called parport that gives excellent output in very simple ways :)

E-MU 0204 for Vinyl Recording: Missing Sampling Rates Using Windows 7 Drivers?

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dgoh88 wrote:
okay just got home, turned the PC back on and now all the sounds are distorted again. Tried completely disabling wireless ports, still the same. About to throw in the towl already
There can be other high priority prcosses as well.
Keep trying with DPC Latency Tool ...
Also, you could try by
- turning off all visual effects of O/S (incl. Aero)
- turn off indexing service
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If you already uninstalled XP then why not install XP as well (dual boot system). Most audio interfaces works better on 32-bit XP compared to Vista/W7 & 64-bit systems.
jutapa

MyRIO aggregate sample rate

Hi Forums,
Quick question, the myRIO AI sample rate is 500kS/s aggregate on the MXP connectors (A and B).
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Tori
Student
Solved!
Go to Solution.

Hey Tori,
Here is a thread on a similar question: http://forums.ni.com/t5/Academic-Hardware-Products-ELVIS/Question-about-myRio-Hardware-ADC-DAC/td-p/...
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The MXP AO has its own DAC and has its own SPI line
Let us know if you have additional questions!
-Sam K
LabVIEW Hacker
Join / Follow the LabVIEW Hacker Group on google+

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I've had my first Mac for only 3 weeks now and have found this board EXTREMELY useful in solving every little problem I've had, even with my lack of Mac & Logic experience, until this one. Thanks in advance for the help.
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