list and cluster

[pdupre]

Hello,

Why in this VI the unbundling of the cluster gives 2 different kinds of data type ?
The 2 list look like very similar. When creating a constant from the cluster it is OK, but when unbundle
it is not !

I do not understand why ?

Regards

[Gabi1]

quite simply, one is a ring control, the other one is an enum control.

the two are quite similar, but an enum can only correlate a string to a Unsigned integer, while a ring can assign any string or picture to any value (eg dbl).

[Dennis_Knutson]

One of the controls is an enum and one of the controls is a ring control. The unbundle is doing exactly the correct thing. The appearance of the two is similar but the behavior is a little bit different because of additional informaiton included with an enum. To see this, wire up the results of the unbundle to a couple of case statements. The ring control labels will be numeric and the enum labels will be the text values of the enum.

[Ben]

HI Gabi1,

THere is another important point that that is important.

These are illustrated by turn on the help window and using the wiring tool while floating over the wires of an enum vs a ring.

The enum actually has the strings as part of its data types. The ring does not. This disticntion makes it possible to wire a enum ot a "format into string" since the strings are "in the wire!"

Done splitting wires.

Ben

[Gabi1]

yes, that why i always prefere to connect the ring to an enum type def via a reference subvi (eg when i need a picture ring on the FP), and then only use enums to wire case structures.

thanks Ben and Dennis for pointing it out.

[pdupre]

Thank for the information, Now the question is, how can I convert the data type from ring to enum ?

[Dennis_Knutson]

To replace, just right click on the ring, select Replace and browse to the enum control.

[pdupre]

It is an idea,
but I want to convert because the ring is from DAQ and I cannot change it

[Ben]

"... I want to convert because the ring is from DAQ and I cannot change it..."

See the example that Jarod posted in this thread.

Use Dennis' tip to create the enum and you should be good to go.

Ben

[Dennis_Knutson]

Typecast it.

Never mind. Look at the example Ben mentions.

Message Edited by Dennis Knutson on 10-19-2007 07:38 AM