Route counter ouputs to same Digital Output
Hi,
I'm not sure this is possible but i'd like to route the outputs of 2 counters (PCI-6602) to the same Digital Output line.
My 2 counters each generate a pulse train defined by frequency, dut-cycle and delay. I want to combine the 2 pulse trains into one resulting pulse train. How would this be possible if I can't route the outputs of the counters to the same digital line ? Do i have to abandon this idea and define the desired pulse train in binary and repeatedly output that to a digital line ?
Many thanks in advance for any feedback here.
Cheers, Shaun.
Solved!
Go to Solution.
In the end I configured a counter for Pulse Train generation and opted to change the duty cycle and frequency via 'DAQmxWriteCtrFreqScalar" (i.e. Pulse Width Modulation)
I registered a callback for the 'DAQmx_Val_CounterOutputEvent' and then changed the dutycycle and frequency in that callback.
Unfortunately, I kept getting "The pulse generation with previous property settings must complete a
full cycle before the property can be updated." error messages and, opon further reading, managed to find a doc where National Instruments suggest adding a 'Wait(period)' before executing the 'DAQmxWriteCtrFreqScalar' call.
The problem with this solution is that it one has to wait a minimum of 2 Periods before the Pulse Train can be modified which is not acceptable for our work.
So is there an alternative solution which allows us to change the Pulse Train after only 1 Period ? Is there an event we can trap which allows us alter the Pulse Train after every period ? I'm sure PWM must be possible on Daq cards (PCI-6602 or PCI-6281 or PCI-6259)?
Cheers, Shaun.
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Attachments:
DIO simultaneously error.vi 31 KBHello Maverick,
Did you have any luck with the example Raven sent you?
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I need to drive stimulus-response with a software driven digital trigger and NI-TIO counter based response. No analog I/O is really relevant, although I have a PCI-6035E multi-function DAQ as part of my gear. I intend to use the analog, but its timing is non-critical and can be software timed.
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Attachments:
Route_RTSI_to_Source.vi 67 KB -
USB-6009 pulse train generation with digital output....
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I've bought a new USB NI-Card (USB-6009) and now I'm trying to adopt an old vi that uses traditional DAQ drivers. I wrote that vi for a PCI NI-Card (PCI-6024E), which has two counters to generate two pulse trains simultaneously. Now I've only one counter and that's why I'm searching for a good way to create pulse trains using a digital output! The pulse trains are both ranging between 100 Hz and 100 kHz.
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Routing counter to PFI line/ not routing counter to any external port - How is it done?
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I am using a counter to create a sample clock for digital output. The counter looks just like the one in the example attached.
I now discovered that the counter frequency is routed to PFI12 of my NI6259. I don´t know why, I haven´t done this. I don´t want the counter at any external line because it causes interferences.
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Attachments:
corrDIO.vi 54 KBThanks for the replies!
I tried the signal routing, but it doesn´t work as I expected. I routed PFI12 to PFI 15. Now the signal is at both outputs. Even if the deactivate or delete the signal routing VI it stays that way.
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Attachments:
Routing signals.vi 8 KB -
How to combine Digital Output, a delay and Analog Input in a fast loop
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Digital Output With Timer (Simulation)
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Attachments:
Digital Output With Timer.vi 16 KBHello Juventom,
As I understand it you want to be continuously checking the value of the sliding bar and comparing that to the upper and lower limit controls whilest also chaning the LED booleans to true for 5 seconds then false for 10 seconds if the sliding bar value is outside of the limits.
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Message Edited by SoNic2367 on <SPAN class=date_text>09-25-2006 <SPAN class=time_text>06:24 AM
Message Edited by SoNic2367 on 09-25-2006 06:26 AM -
How to do a digital output triggered by the falling edge of a clock?
Hello !
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Hello! I recently bought a new motherboard MSI K8N SLI Platinum that have onboard Sounblaster Li've 24bit, with coaxial and spdif and also the standard outputs. I ve connected via a fiber optical cable to my amplifier and i checked the digital output only box to the advanced settings on the mixer. I am hearing sound very well from my amplifier but when i connect headphones to with microphone to my soundcard , i don't hear anything at all from my headphones. Also i cannot speak via microphone. If i uncheck the box digital output only i hear sound from my headphones and also i can speak to microphone. Is there some way to have them both enabled? In my previous motherboard i didn't have that problem. I could hear sound from my amplifier with pcm signal and from my headphones and microphone analog at the same time.
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The clue is here: " i take acquisition with one sample on demand."
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Write digital output on wireless node
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In order to use the WSN-3202 with Gateway-9791, you have to install LabVIEW and NI-WSN driver.
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For the more detailed description, please have a look at the attached waveform. Hope you can shed some light on the possibility of doing this.
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Attachments:
6534 Triggered Digital Output.JPG 95 KBHello tiddlycorona,
From the diagram you provided, you can try the Gen Dig Pulse-Retriggerable.vi. This LabVIEW example demonstrates how to generate a digital pulse from a Counter Output Channel on a digital trigger. The Initial Delay, High Time, Low Time, and Idle State are all configurable. It also shows how to use a Digital Start trigger, so the digital pulse is not started until a trigger signal is received. Though the pulse is configured in terms of ticks, it can easily be modified to generate a pulse in terms of Frequency/Duty Cycle or Time.
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