how to check the Ni cable for pci dio 32hs

[VivekM]

hi..

i m using PCI DIO-32HS card for audio data acquisition. well i have made a VI that will continuously acquire data and simultaneously write it on to the file .  Using internal clock,and without connecting any data on i/o pins , if i run the vi then it acquires the scans and makes a file of it. in this case it contains all zeroes as nothing is connected to it. now to check the cable i fed the dpull (pin 38)  with the 5 volt supply  from pin 1 though a 12k resistance. as this will drive the dpull pin high so the output must become 1 for all the floating pins(all pins  in my case as i have not connected anything to any other pin)but it is coming all zeroes. can anyone explain why??

what is the way to check if the cable is alright or not..

please help its urgent....

vivek modgil

[Brian F.]

Hello Vivek. 

Thank you for posting to the NI Discussion Forums. 

You are correct in assuming that if you connect the dpull line to the 5V supply, that all pins that are not connected should be pulled high.  Have you tried hooking up a handheld DMM to pins on the DAQ card to see if these lines are in a high state?  This test will indicate if the lines are not being pulled high, or if there is something else going on such as incorrectly writing to the file.  Also, I would recommend omitting the 12k resistor when making the connection between dpull and 5V lines.  This is not necessary and this resistor may be pulling the voltage lower than a logic level high. 

Give this a shot and let us know how these troubleshooting steps work.  We would love to help!

Have a great day!

Brian F
Applications Engineer
National Instruments

[VivekM]

Thanx Brian.....

well the problem got solved..... it was the 12k resistance that was causing the drop so that the floating pins are read as zeroes....

now i m getting right contents in my file i.e. all 1s.... Now i will try some audio data for acquisition...... i need a mininmum speed of acquiring the data to be 1MHz. according to the manual it is possible to get this much speed for pattern I/O (which i m using),but in some other thread i have read the practical max speed attained is 10khz only...lets see what happenes...

thanx once again.......

i will mail u if some error occurs....

regards

vivek modgil