Can I synchronize two pci boards - DIO-6527 and MIO6036E - via RTSI?

[kathrine]

Thanks in advance. I'm interested in synchronizing a Analog PCI (MIO 6036E)and a Digital I/O board (DIO6527). But I am not sure if this is possible via RTSI. Can anybody give me some advice? Are there any Digital I/O boards which own a RTSI-interface?

[Labviewguru]

Both boards have a RTSI bus for this exact purpose.

Get a RTSI cable from NI,and you are all set.

[Russell]

Actually, there isn't a RTSI interface on the DIO-6527! The only digital boards that do are the DIO-653x boards. The DIO-6527 only does unstrobed I/O so I'm I guess I'm not sure why you'd want RTSI synchronization.

Russell
Applications Engineer
National Instruments
http://www.ni.com/support

[kathrine]

Thanks. But I thought I needed RTSI synchronisation because the MIO 6036E has got a RTSI interface. Do you know how I can synchronize both - DIO and MIO? Both boards have to be synchronized because de DIO is supposed to work as a trigger card for the MIO. E.g. once the DIO received a trigger between 10 to 24V the MIO has to react with a measurement on a Analog In within 50ms.
The reaction is a realtime problem which can be avoided by buffered readings. My solution ist to buffer the digitalI/O and the corresponding analog In. if the digitalI/O is true the buffered values are stored.
Thus I want to synchronize the scans of the DigitalI/O and the Analog In.
Is there another chance of synchron. these boards?
Or is it recommended to replace the 6527 by a 65
3x?

[Russell]

Well, you can't do buffered pattern input with the 6527. You can only sample the digital lines one scan at a time through software. The speed of this is limited by the speed of the software.

Now, the MIO board already has a built in hardware trigger you can use to initiate an analog acquisition. You can also use your MIO card to "gate" the scan clock using one of the counters. (Only acquire scans while the gate signal is high, for example)

From what I gather, it seems you want to sample the AI and the DI with the same clock and be able to associate each analog sample with a corresponding digital sample. If you do need to do a buffered acquisition of digital patterns in addition to triggering an analog acquisition, then yes, you'll probabl
y want to switch to a 653x. Then you would be able to share the same clock between the two.

If I have misunderstood your application, then could you give me some more detail about what you would like to happen?

Russell
Applications Engineer
National Instruments

[<Mike Ross> mross@smpcorp.com]

You may be able to use triggered, buffered acquisitions with external
scan clock.

In theory 2 DAQ boards would be synchronized it they use the same
trigger signal and the same external scan clock (don't use the
separate and probably different clocks internal to the boards). You
might want to try and test the accuracy somehow if it is really
critical...read some sort of test signal and compare the results.

Mike

[kathrine]

Thanks for your comment. It is in deed that wy you understood it. I guess it'd better if I change the DIO for a 653x.