How to define in different controls device and channels in a DAQmx function?

Hi,
I need to build a vi that permits the user to change the device of a DAQmx acquisition system, although I don't want that the user modify the input channels. I`d like to know if it is possible to define in different controls device and channels.
[]´s
Juliana

Hello Juliana,
What you would like to do is possible with some simple string manipulation. First you will need a Device Name constant from the DAQmx >> Advanced >> DAQmx Constants & Property Nodes palette. Right-click on the constant and turn it into a control. Then, use a concatenate strings function to join the device name with the rest of the characters you need to define your input channels. Wire the output of the concatenate strings VI to your DAQmx Create Channel VI.
Let me know if you have any questions on this.
Thanks,
Laura

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Sessions, Devices, and Channels

In previous versions of the driver, if I defined more than one IP address in the "device names" field of an "open session" vi...then each USRP "device" was actually referred to as a "channel" according to the Property Nodes, or documentation of say a "Configure" vi..
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Brandon

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0) On the VIs that have the "channel list" terminal, that string means the same thing as "Active Channel" in the property node and can take the same values.
1) Channels are uniquely numbered in monotonically increasing order in a session. For example,
Single device, single channel (device names="192.168.10.2"): There is a single channel "0"
Single device, multi-channel (device names="192.168.10.2"): There may be two channels, "0" and "1"
Multi-device, single channel per device (device names="192.168.10.2;192.168.10.3"): The channel on the first device in the list is "0" and the channel on the second device is "1"
Multi-device, multi-channel per device (device names="192.168.10.2;192.168.10.3"): The channels on the first device in the list are "0" and "1" and the channels on the second device are "2" and "3"
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3) You can set multiple attributes at once by specifying a wider scope.
Let's say you have a multi-device, multi-channel per device session. So the channels are "dev0/0", "dev0/1", "dev1/2", "dev1/3". If you set the Gain property with the scope
"dev0/0" : it only sets the Gain on that specific channel
"dev0" : it sets the Gain on both channels of dev0 ("0" and "1")
"" : it sets the Gain on all channels on all devices in the session ("0","1","2", and "3")
If you set the Reference Frequency Source property with the scope
"dev0" : it only sets the Reference on the first device
"" : it sets the Reference on all devices in the session
"dev0/0" : doesn't make sense because Reference Frequency Source is a device, not a channel, attribute
4) Similar rules apply to reading attribute values back, but you can get into trouble. If you read an attribute with a wide scope (e.g. read Gain with a "" Active Channel) it will return a valid value ONLY if all of the channels in the session have the same value for that property. Otherwise, you get an error.
5) Enabled Channels is a Session attribute, so the "Active Channel" property should be "" or just not set at all when you set that property.
Let's say you have a multi-device, multi-channel per device session with channels "0", "1", "2", and "3".
To enable only channels "0" and "2", set
Active Channel = "" (applies to entire session)
Enabled Channels = "0,2"
Patrick

How to use the different class for each screen as well as function.

Hi Experts,
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With BestRegards,
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Hi ThippaReddy,
see this sample code
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Vasu Anna Regional Feeling a???? Just Kidding
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Hi John,
It didnt worked.
I typed:
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It simply ignored this and stored everything in the wrong members for the dimensions.
Any other suggestion?
Velázquez

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LabVIEW Champion

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How to define in different controls device and channels in a DAQmx function?

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