Want to know compatible Card?

[Ali211]

I want ti implamant a protocol in which a pulse pattern of 30 pulses (.5us pulse width ,2usec time period) is to be transmitted and another pattern is recieved after 300us  then next pattern is to be transmitted on the basis of recieved pattern and similarly the data transnission takes place. I am having NI PCI 6251 . Is it possible to create this cyclic transmission and reception by progaramming in Labview?if yes please give me some guidance.

Yours sincerely.

[GerdW]

Hi Ali,

your PCI6251 has specs of 10MHz clock for all DIO pins and 2 CTRs with a 80MHz source clock.

So you should be able to generate pulses as described and also to receive bit patterns as described!

[Ali211]

I generated pulse pattern but to achieve time intervals i m using timed loop that is not becoming less than 1ms. Is there any way to create time interval in useconds between transmission and reception with out using Realtime PC targeting?

Yours sincerely

[crossrulz]

This is a good situation for LV FPGA.  You can use an R series card and program the FPGA in it to do your communication protocol.

Using your current card, you need to generate a digitial waveform and tell the card to send the waveform.  You will also have to tell it to recieve a digital waveform that you can read.

Windows cannot be relied upon for timing.  So I am back to recommending FPGA.

[Ali211]

Can i resolve the issue of timing by using Labview real time PC targeting.? Is it reliable?

Yours sincerely

[JasoNI]

Hello,

It sounds like you are trying to use software timing, when you can accomplish only accomplish this speed using hardware timing. Instead of trying to send a pulse in software every time you want to send one, you can tell the hardware how fast to output the signal and send data in packets. I have included a link below explaining the difference between hardware and software timing. I hope this helps!

Hardware vs. Software Timing: http://zone.ni.com/reference/en-XX/help/370466V-01/mxcncpts/hardwresoftwretiming/

Regards,

Jason D

Applications Engineer

National Instruments