Simultaneous sampling using two PXI-6562 cards

[Nathan J]

Hi all,

I was wondering if there is a way to have two PXI-6562 (High speed LVDS I/O) cards sample at the same time using the same trigger?

Thanks in advance,

Nathan

[Oli_Wachno]

Hi Nathan,

AFAIK this is no problem, I did something similar with three 6551. You will have to configure the same start trigger (e.g.. PXI Star trigger) and the same sampling clock, e.g. using SMC technology

Oli 

[Jonathan_S1 · Accepted solution]

Hi,

You can definitely synchronize multiple SMC devices, including NI HSDIO modular instruments.  The most efficient way to do this is to use the NI-TClk Synchronization API.  This is included with many of our modular instruments drivers, including NI-HSDIO.  The first part of this KnowledgeBase discusses using the NI-TClk functions to do this.  This tutorial gives a very in-depth introduction to timing and synchronization using the NI-TClk API. 

If you are more concerned with how to actually program such an application, I'd check out the NI Example Finder for some good examples.  Browse to Hardware Input and Output» Modular Instruments»NI-HSDIO» Synchronization» Multi-Device Dynamic Acquisition (TClk).vi

Jon S

[Nathan J]

Thanks Jon,

I knew there had to be something like that. Thanks for pointing me in the right direction.

-Nathan

[ssdcsdc]

Hi Nathan/John, I am working on PXI-6562 for LVDS communication. Before giving any signal to DUT I want to sure about generation & acquisition of LVDS signal. I am trying to do loop back test using PXI-6562 card. I am able to generate the LVDS signal through 6562 (through MAX) & also able to verify the generated signal on CRO but I am not able to read the same generated signal on PXI-6562 (using MAX). I have connector block - 2164 & I am connecting two channels using SMA male to SMA male cable. I am using MAX to generate & read the LVDS signal. Do you have any Idea where we are wrong? Thanks in Advance for any help

[Joshua-B]

Hi ssdcsdc,

I'm not sure what might be causing the issue right off the bat.  If you are using LabVIEW, I would recommend trying one of the shipping examples for the HSDIO API.  These can be found in LabVIEW under Help >> Find Examples >> Hardware Input and Output >> Modular Instruments >> NI-HSDIO.  There are several examples related to dynamic generation and acquistion.

If you are still encountering issues, I would recommend that you create a new thread.  The current thread that you have posted on was regarding a different issue that was solved nearly 2 years ago.  You will probably get more responses by creating a new thread.