where is RTSI trigger lines in 6711 card

[dragondriver]

Hi there,

  I have a PCI-6711 card. The manual said it supports the RTSI trigger line to connect the external clock as the timing source. I try to find the pin associate with the RTSI in the layout for PCI 6711 but I didn't see any. I only see PFI8/GPCTR0_SOURCE. Is it the same thing? I am pretty confusing how to use external clock to replace the internal software-based clock. Thanks.

[Jordan-G]

Hi dragondriver,

Refer to this KnowledgeBase article for information on the RTSI trigger lines on PCI cards. The RTSI bus will allow allow synchronization between DAQ devices on the computer.

Regards,

Jordan G.

[dragondriver]

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@TheRealMichaelJordan wrote:

Hi dragondriver,

Refer to this KnowledgeBase article for information on the RTSI trigger lines on PCI cards. The RTSI bus will allow allow synchronization between DAQ devices on the computer.

Regards,

Jordan G.

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Thanks you. I didn't realize that there are some pin on the top of the card. But then cause my doubts. I have a 6711 card. Many posts said that it only support softwared based clock, I cannot use the external or hardware clock to drive the digital output. Ok, so my question is, can I connect the external clock to the RTSI pin so as a hardware clock and use it to drive the analog ouput and counter output? The manual said I can use the external clock connected to the PFI or RTSI, so are they the same. It is so confusing since I don't see any example to do that on 6711 card and I don't know which PFI pin I should go to ?

[Jordan-G · Accepted solution]

Hi dragondriver,

Yes, you can connect an external signal to any PFI or RTSI<0...6> pin as the source for the AO Sample Clock to initiate AO samples. For counter output, you can choose any PFI line for the gate or source signal.

Regards,

Jordan G.

[dragondriver]

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@TheRealMichaelJordan wrote:

Hi dragondriver,

Yes, you can connect an external signal to any PFI or RTSI<0...6> pin as the source for the AO Sample Clock to initiate AO samples. For counter output, you can choose any PFI line for the gate or source signal.

Regards,

Jordan G.

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Thanks for the clarification. So if I use PFI as external source of clock. Is it still 20MHz limit? I read the manual about the RTSI, it said the RTSI timebase has limit on up to 20MHz, is it true for PFI also?

[Jordan-G]

Hi dragondriver,

You are correct, the maximum frequency is the same for RTSI and PFI.

Regards,

Jordan G.