How to generate two finite digital pulses with a phase difference of 90deg on DO of PXI-6289

[Ramachandraiah]

Hello,

I need to generate two finite number of pulses with a phase delay of 90 degree on DO channels of PXI-6289.

Actually the requirement is to simulate Encoder Output pulses with 90 degree phase difference between them. I've tried to simulate pulses using counters on the card but It was not allowing to generate finite no.of pulses so I want to use DO channels of PXI-6289.

Please help in resolving the issue.

Thank you.

[Michael_Munroe]

Your card supports digital waveform generation on the first digital port with a buffer of 2047 samples. Implementing the 90 degree shift requires 4 samples per cycle for a total count of 511 cycles. If you need more, then set the buffer to repeat indefinitely. Since this operation is performed in hardware, you can calculate the exact timing of the repeat and disable the repeat before the count is completed and change the buffer contents to obtain an exact count. 

Here are details on the configuration:

https://forums.ni.com/t5/Example-Programs/Digital-Waveform-FIFO-Regeneration-on-M-Series-Devices/ta-...

[Ramachandraiah]

Hi,

Thank you for your response, but I need Generate two Digital Output pulses on two DO channels with 90 degree phase difference between them.

[Henrik_Volkers · Accepted solution]

configure the two output lines to output this pattern in a loop:

0011

0110

0231 <- 

[Ramachandraiah]

Thank you very much