Read 32kHz data using 8451

I need to read 32kHz data coming in synchronization with 32kHz clock. Can I use 2 digital i/o lines of 8451 and poll continuously to be able to read it? Is there a better way of reading data? I have LabVIEW 8.5.
Any comments or ideas welcome.
Thank you.

Hi,
You will not be able to use the NI-8451 for this application since it is software timed.
You need a Data Acquisition card that would be able to do hardware timing.
Please include an email address or phone number if you'd like me to have your territory rep. contact you to help you pick a module out of the huge variety of DAQ cards that NI sells.
What form factor do you prefer? (PCI is the most economical way to go.)
Rergards,
Sammy

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Is it possible to read digital data using an external clock (PCI-6259 M)?

I’m using a NI PCI-6259 M Series card and trying to write my program in VC++6.0 using the functions in the DAQmx driver.
Question1: Not all functions listed in the NI-DAQmx C Reference Help seems to be supported by my NI-card, where can I find information about which of the functions that are supported?
Question2: I want to read data from a device that clock out data on the falling edge of a clock signal. The clock signal and the data signal are routed to two DIO terminals on the NI-card. The question is if it is possible to read data using the clock as a sample clock? See two code examples below that doesn’t work. In both cases 10 samples are read at once, even if the external clock is not present.
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Hello Magnus,
Thank you for contacting National Instruments.
"Question1: Not all functions listed in the NI-DAQmx C Reference Help seems to be supported by my NI-card, where can I find information about which of the functions that are supported?"
The best place to look for this information would be the M Series Help Manual. There you can find the features of your PCI-6259 and what operations it supports.
"Question2: I want to read data from a device that clock out data on the falling edge of a clock signal. The clock signal and the data signal are routed to two DIO terminals on the NI-card. The question is if it is possible to read data using the clock as a sample clock? See two code examples below that doesn’t work. In both cases 10 samples are read at once, even if the external clock is not present."
Look at the "ContReadDigChan-ExtClk_Fn.c" example project which ships with the NI-DAQ driver. This is located at: C:\Program Files\National Instruments\NI-DAQ\Examples\DAQmx ANSI C\Digital\Read Values\Cont Read Dig Chan-Ext Clk.
You will have to make some minor modifications to convert this to a finite acquisition, but that is simply a matter of changing the "sampleMode" parameter of the DAQmxCfgSampClkTiming() function. You will also have to route your clock signal to a PFI line and specify which line in your code.
I hope this helps.
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Applications Engineering
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Attachments:
Krishna_Files.zip ‏552 KB

The binary data file has no time axis information, it is pure y data. Only the LVM file contains information about t(0) and dt. Since you throw away this information before saving to the binary file, it cannot be retrieved.
Did you try wiring a 2 as suggested?
(see also http://forums.ni.com/ni/board/message?board.id=BreakPoint&message.id=925 )
Message Edited by altenbach on 07-29-2005 11:35 PM
LabVIEW Champion . Do more with less code and in less time .
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Retrive_BINARY_DataMOD2.vi ‏1982 KB

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Attachments:
Transmition_Data _ECU_ A_50Hz.JPG ‏80 KB

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