acquisition with different pci-cards

[gkonstan]

hello,
I would like to learn the objectives to take care of in acquisition with two
different pci - cards. Is there something special about configuring the two
cards in the same VI and how can I be sure that the subVIs acquire data
simultaneously?
Please send me some information about bibliography or notes.
thank you

[Fan Zhang]

to your question, no. Nothing special to configure two pci cards at the same
time in one program. You can distribute two IDs to them then call the one
you would like to call in your application.


"gkonstan" wrote in message
news:90ggtt$i28$1@foo.grnet.gr...
> hello,
> I would like to learn the objectives to take care of in acquisition with
two
> different pci - cards. Is there something special about configuring the
two
> cards in the same VI and how can I be sure that the subVIs acquire data
> simultaneously?
> Please send me some information about bibliography or notes.
> thank you
>
>

[markwysong]

That is true; however, if you want the acquisitions of both boards
started at the EXACT same time then you need to order a cable that
connects to both RTSI connectors on the PCI boards from National
Instruments. Once you have that cable, then you can call the Route
Signal VI to route a start signal to both boards and simultaneously
start them.

In article <90ham7$j4p$1@netnews.upenn.edu>,
"Fan Zhang" wrote:
> to your question, no. Nothing special to configure two pci cards at
the same
> time in one program. You can distribute two IDs to them then call the
one
> you would like to call in your application.
>
> "gkonstan" wrote in message
> news:90ggtt$i28$1@foo.grnet.gr...
> > hello,
> >
I would like to learn the objectives to take care of in acquisition
with
> two
> > different pci - cards. Is there something special about configuring
the
> two
> > cards in the same VI and how can I be sure that the subVIs acquire
data
> > simultaneously?
> > Please send me some information about bibliography or notes.
> > thank you
> >
> >
>
>


Sent via Deja.com http://www.deja.com/
Before you buy.

[henk hessel]

wrote in message news:90o7uf$e5c$1@nnrp1.deja.com...
> That is true; however, if you want the acquisitions of both boards
> started at the EXACT same time then you need to order a cable that
> connects to both RTSI connectors on the PCI boards from National
> Instruments. Once you have that cable, then you can call the Route
> Signal VI to route a start signal to both boards and simultaneously
> start them.

A better way is to route scanclock via RTSI from the 'master' to the 'slave'
board.
in this way there is a constant delay (within one channel clock period)
between channels on these boards.
You have to specify on the slave board that the scan clock comes from RTSI.
Don't forget to make the channel clocks identical.
Read the help of AI Clock Config (see inside AI start.vi)
You need 2 calls to AI Clock Config on the slave. One to set the Scanclock
and one to set the Channel clock)
If you need more accuracy you also have to route the board clock (20Mc) via
RTSI.
Start the slave first, so that it is ready to receive clocks from the
master. Then start the master.
>
> In article <90ham7$j4p$1@netnews.upenn.edu>,
> "Fan Zhang" wrote:
> > to your question, no. Nothing special to configure two pci cards at
> the same
> > time in one program. You can distribute two IDs to them then call the
> one
> > you would like to call in your application.
> >
> > "gkonstan" wrote in message
> > news:90ggtt$i28$1@foo.grnet.gr...
> > > hello,
> > > I would like to learn the objectives to take care of in acquisition
> with
> > two
> > > different pci - cards. Is there something special about configuring
> the
> > two
> > > cards in the same VI and how can I be sure that the subVIs acquire
> data
> > > simultaneously?
> > > Please send me some information about bibliography or notes.
> > > thank you
> > >
> > >
> >
> >
>
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.

[jimbo]

To assure that the signals are timed properly you should use buffered aquisition
with a shared trigger. This trigger can be routed from card to card using
the rtsi connector on the card. In this way the card will aquire data simultaneously
regardless of the flow of your program. You will not recieve the data simultaneously
in your program, but you will know that it was taken simultaneously. I have
assumed that you are using National Instruments DAQ cards.

"gkonstan" wrote:
>hello,>I would like to learn the objectives to take care of in acquisition
with two>different pci - cards. Is there something special about configuring
the two>cards in the same VI and how can I be sure that the subVIs acquire
data>simultaneously?>Please send me some informati
on about bibliography or
notes.> thank you>>

[shami81]

Hello guys can you please translate the above discussion in simple english, i mean i dont know what does this RTSI means can you please tell me that. I am using  PCI-4472 and PCI-6025E cards and i need to read data from these cards in the same vi. Please help me about this issue as soon as possible. I will be thankfull to you guys. Moreover tell me the name of the cable also which i will have to use for getting the simultaneous data from two cards.

[J_Thomas]

Hi shami81,

RTSI stands for Real-Time System Integration and it refers to the method used to synchronize multiple PCI devices. 

1. Buy a RTSI Cable:

    RTSI Bus Cables

2. Connect the RTSI cable between the two PCI boards that you have

3. Configure the RTSI cable in Measurement & Automation Explorer (MAX)
                1. - Open Measurement & Automation Explorer (MAX)
                2. - Right-click on Devices and Interfaces and select Create New..
                3. - Select RTSI cable from the list and then press Finish.
                4. - Right-click on the entry for your PCI-4472 under Devices and Interfaces >> NI-DAQmx Devices and select properties
                5. - In the Device Properties dialog box, select the RTSI cable you just created
                6. - Repeat these last two steps to select the RTSI cable in the Device Properties Dialog Box for the PCI-6025e

4. Find a synchronization example:

                - Open LabVIEW and then go to Help >> Find Examples.  Browse to Hardware Input and Output >> DAQmx >> Synchronization >>Multi-Device
                - Search NI.com for DSA and E-series synchronization examples