Digital input line showing an entry without connected equipment

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• simultaneous monitoring of the digital input lines when executing digital writing tasks

  I'm writing a multithreaded application in C on Windows 7, using the 9.6 DAQmx API and device USB-6509. This requires that we constantly monitor several lines on the 6509 for entry, digital using the change of the device detection feature. You must also write the digital output without having to stop monitoring the input rows. It is very important that the input rows be monitored continuously for the duration of the project.

  In the DAQmx manual reading, it seems that it is impossible to make a digital reading as well as a digital writing occurs, even if these tasks are performed in different threads. (The same I understand, that it is impossible to have several tasks of digital entry running simultaneously.)

  It seems that it would be possible to launch the task for reading (configured with the change detection), to pause playback, start the writing task, pause the task of writing, and then re - start the task of reading. But - and this is the important part - for the duration of the writing task is running, is it possible to configure it to the task of reading will always monitor the lines, even if it's just stores the data in the buffer for these periods? The key is that the data will be lost.

  Thank you

  Danielle

  Each channel is independent. If you can get the input data that you export a value. You need not make a break each task. The two tasks are parallel.

• 3 digital inputs for the structure of the case

  I'm in the early stages of development a VI that will monitor 3 digital input lines. Only a single digital input will be active at any time. For each digital input, a VI runs under different.  Currently, I use 3 structures distinct case (attached).

  Is it possible to use a case structure (3 cases over a default value) to monitor three digital input lines?  Specifically, how to convert Boolean data (digital input lines) to a data type recognized by the terminal selector?

  Thank you

  Bill

  Adding to my post from yesterday.

  In defining an enum for each possible value with a descriptive name, it is easier to follow what the code is doing.

  The attached VI (7.1 LV) shows how I could manage three types Boolean controlling a press to ensure that security is set, and the part is in place when the operator chooses to activate the press.

  

  This approach allows you to treat each of the 9 possible States only.

  Of course, this approach is not feasible for more than 5 bits (Boolean) (unless you have an intern to the no, not me!)

  Ben

• PCI-MIO-16-1 shows the digital inputs 1-7 on, without same cable connected

  Max, my PCI-MIO-16-1 shows the digital inputs 1-7 as having entries of tension without same cable connected to the Board. No amount of spin with her (to the MAX) seems so he can act correctly in input or output mode. It's true, there are voltages on these pins. If I connect my cable (to a TBX-68 block), I see that it has on $line0 (on port0) 0v, 5v on line7 and 2, 5V on the rest. Trying to put these lines to something else in MAX seems to do nothing. (I also can't control the OD, either.)

  This card has tried to get a couple of have Weiwei at high speed. Now that I'm branching out, I found a strange behaviour. Of course, I tried to restart and turn off the computer and turn it back on. Automatic test MAX Returns instantly with a message "transmitted", that gives me hope, even if I don't trust the speed at which it seems to perform the check.

  I'm a complete noob at this stuff. Is there something obvious that I might be dominant? Is there a way I can test more deeply that the card works as it should?

  The open connections to the TTL inputs are usually detected as logic 1. You are not testing properly. Connect an entry to two gnd or + 5V. Don't let them ever floating.

• can I send a fax without connecting to a phone line

  I plan to move to a 'verizon wireless' home phone that does not support faxes... Is there a way I can send a fax from my HP Officejet printer all-in-one without connecting to a phone line?

  Hello
  Unfortunately, it is not possible. Need to connect both devices to send a fax.

• Digital input current limits

  Hello

  After reading everything that specifications and manuals, I decided to ask a general question.

  In the data sheets, user guides I've read, in general, there are two warnings for DIO:

  -Do not connect the outputs digital circuits which operates above the limits.

  -Do not drive the line with tensions outside its operating range.

  Generally speaking they tell me I need to know when dealing with output and voltage when dealing with entries. So I have this question, can I wire a power supply for digital inputs directly without exceeding its "beach of normal operation and without any protection circuit? In fact, my feelings, this is not possible. But why certain documents produced clearly mention that the impedance internal inputs while that of others is not clear those? How can I determine if I can connect a signal directly to an entry (for example USB-6525 indicates a current limiter circuit, but I don't see a clear explanation in the datasheet USB-6251)?

  As long as the input voltages are within specified limits, no damage will be the DAQ hardware. Logic devices often have two lines of non overlapping input, one for low input and high input. If the input voltage lies between the beaches, the performance of the device can be unpredictable. Also, check your power supply to make sure that this doesn't not exceeding when turned on or off as that could exceed the DAQ limit.

  Lynn

• How much noise is expected on 6353 digital output lines?

  I'll send a signal to pass a set of relay reed with the port on a pci-e 6353. When the line is low, the noise is ~ 10 mV. When it is high, the noise is ~ 30-40mV. The noise seems to be done through the signal lines in the reed relays.

  What is the level of noise that is expected?

  I intend to move to electrostatic armoured relay. Meanwhile, the filter mentioned in the manual of 6353 only apply the digital input?

  Thanks for the help

  Hi Nico,

  Here are the results of my 6353 running a DO loop to HAVE (high and low)

  

  So, at the logical level above I see noise on the order of what you described.  Logical low my noise is significantly lower.  I guess it depends really how noisy your mass plan is and what does the Board of Directors, as well as what is connected to it.

  * Edit, I suppose a more legitimate test would be to use an array 2 to measure the output voltage.  I still think that this test has some merit by showing that little noise on the line is not uncommon.

  In any case, since the lines are outputs digital, the spec just says that they must reach TTL voltage levels (< .4v="" for="" a="" logic="" low,="">2.4V to the logic of the top).  I did all the typical numbers for the noise on the lines, but what you see does not seem unreasonable.  Have you tried the bypass capacitors by adding to your relay by chance?

  Best regards

• The iMac has a digital input?

  Hello

  I searched for centuries for the answer to what I thought was a simple question - the iMac has one digital input (optical or other)?

  I know that the headphone port doubles as an analog audio to as well as an optical digital output, but this port also accepts input optical? If not, is it possible to enter a digital signal via a USB port?

  I have an iMac (20-inch, mid 2007).

  Thanks to all who can help.

  AL

  Yes exit usb audio and are truly comprehensive external soundcards, they can have any type of entry and exit of the machine to be desired that they have

  and if they do a driver of OS x for him it's just a matter of connection installing the driver and choosing the entry in system preferences for being that

  https://Flipboard.com/@mariahlolas/top-10-best-USB-external-sound-card-adapters-for-Windows-and-Mac-2016-2017-npa5lltvz

  If the audio minijack that also take in charge the headset for iPhone I believe support the digital input and I don't know if

• Digital input to Toshiba 46TL-&gt; no analog audio output to amplifier

  Hi all

  When I connect a video source (e.g. computer laptop via DLNA) to my 46TL, output TV audio analog (red/white taken connected to an amplifier) does not work.

  It does, however, watching television.

  Is it possible to configure the TV to read the audio data from digital input (HDMI/DLNA) to the analog output?

  Thank you for the help

  Not quite what series of TLxxx you have, but for example the TL938 supports a digital (optical) audio output port that provides a digital audio signal.
  Why n t connect the amplifier to the TV using this Jack?

  Connectors for component video / audio to the rear of the TV are the ports of ENTRY and not the OUTPUT ports. So, you can send an audio signal to the TV and not the amplifier output.

• Digital input triggering

  Hello

  Is it possible to trigger action digital input using the signal I want to measure? In the example:

  I want to measure PWM on P0.0 after first rising edge PWM on P0.0, but using only this line P0.0 (no PFI in use, only one used digital entry).

  IM using X SERIES USB-6353.

  Some DAQ cards can trigger on analog edge of the signal you want to measure. If a DI data extraction, it is possible to select only the PFI or similar as trigger. What is your application? What you want to achieve?

  I can imagine you could workaround: record streaming samples of DI and do a SW trigger in your program, so you can get the same samples prédéclenchés (as in a digital oscilloscope).

• NEITHER 6501 digital input

  Hello world

  I use an NI USB-6501 and I'm trying to understand how to read the entries.

  I used this card to generate output using the example vi write Chan digging, it works fine.

  Now, I'm trying to use the example of reading dig Chan vi to read an input voltage. But it seems that, by default, the map reads 5V (a 1 logic) as entered on each pins, even if nothing is connected to them. I tried to connect the output to the input, use a relay to see if it detects a change in the entry, if we send a voltage or not, but it changed nothing. It still reads 5V anything.

  Can someone help me understand how to be able to read an entry? This problem has happened to someone else?

  Thanks in advance.

  Frédéric

  If you dig through the data sheet, you will see that there is a 4.7kOhm shoot all digital inputs.  So with the floating inputs you will get a high (logic 1).

  As Dennis have already said, wire your digital output directly into your digital input.  So everything that you set the output that you will read on the entry.  I don't know what you do with a relay.

• Playback of digital input [FPGA] - NI 9401 - questions?

  I'm having some trouble with the digital input NI 9401, which is to have a uniform reading. I have a photogate that power of a digital output is turned off and goes in to a digital input module, but I can't read the entry several times. My LED flashes once and never again will blink until I restart my CRIO or recompile. I have launched the ports of entry and exit, their market and constantly for loop. Any idea what's going on?

  

  Hi Allan,

  Why you "light up" a channel of entry?

  Writing a value to a DIO PIN is usually for outings!

  What is connected to your PIN DIO 5? Have you checked the entry with a DMM measure?

  How long the impulses are measured with this entry? Do you really you can see short pulses of light flashing?

• NI 9425 digital input module

  Hi, could someone please advise me on the following: I plan on the use of the module in the series c with a compact RIO 9425 to detect various devices 24V DC signals. Can I just plug the plug of DI to the positive terminal of a 24V + power and the COM pin to the 0V of the 24V power supply? The card then detects when the power is turned on and provide a path to the DI pin too the COM pin so compelting the circuit. Or should I connect to the card in a different way? Regards Robert Foat

  This module is made for 24 v logic.  So yes, you can simply plug your blood directly into the entries.  It was to provide resistance 30kOhm grounded (impedance of entrance in the spec).  It is generally not a good idea to rely on a digital input to complete a circuit.  The digital input should be a meaning.

• Digital inputs only noisy when the laptop is plugged

  I had problems with loops of Earth and power supplies for laptop in the past.  But it is the first time I got it so wrong that it makes the digital inputs which are both related to the ground and the debounced software cannot be used.

  It is NOT material OR.  It's a DT9816 of data translation, a USB DAQ Multifunction with small budget.   The laptop with the problem is a refurbished Dell, with a very obvious not Dell PSU who throws to the top of the warning in the BIOS and scales back from the processor.  (Danger Will Robinson!)

  The problem with the digital entries shows only upward on the Dell when it is plugged into a power outlet.  On all other machines and with the printer unplugged Dell, digital inputs floating.  But those that I have attached to the Earth is rock solid and work very well.

  What surprises me is more than the noise is so bad that even tied to the ground with a half second debounce, I get always false triggers.  I have not brought to power, but considering that it sounds really loud, I suspect that it looks pretty bad.

  I think I'll try a powered USB hub.  If this does not work, then I think that the customer will have to replace the power supply on the laptop.

  However, I was surprised.  I used a lot of USB DAQ hardware, and it's the first time I've never seen a problem like this.  The NI USB 6002 I tested on this same laptop does not seem to show the same problems.  Even if it is true that this is a different software and the test was brief.

  I'm curious to know if other developers have found something similar in the past.

  I can confirm that using a USB hub external powered eliminated the problem of noise in the original post.

  Interesting things.  I had not seen this before.  Now, I wish I had again the NI DAQ USB I had here last week so I could test that.

  Looks like I'll use a hub powered on this project.  But I think I will recommend always replace this power.  Although a lot of noise coming from the power supply, probably isn't good for nothing plugged it... or even sitting near him.

• A voltage divider will be enough to read a 28V pulse in NOR-6251 digital input ports?

  Hi all

  I am a scientist life sciences that attempts to read a 28V 4.2mA pulse signal sent from my operative box animals in my NOR-6251.

  Sounds like a voltage divider should do the job. But I would be aware of anything else that my card OR not to burn? And should I be concerned about the current entry in the map OR?

  Thanks for your help!

  Hello

  Research on page 7 and 8 of the Datasheet of NOR-6251 , it shows that the maximum voltage is 5.25V, so use a voltage divider to make 28V up to 5V and you should have no problem providing you can guarantee your 28V source will always be to 28V or less and your resistances are fairly accurate. Under no circumstances should provide you more 5.25V to the digital input.

  The only concern you have on current is that the resistance divider is not affected by the impedance of the digital input which is little likely (datasheet says max 250uA), so if you use resistors around the range of 5 to 50 k, you should be fine. Also, be sure your part of wiring resistance as if she had the wrong way, you will have a great chance to break the map!

  I hope this helps!