Join Numbers VI, 8-bit, 16-bit, etc.

I am a "LabView beginner" and am tyring to process an array of data acquired into an array of 8-bit elements. I'm using a PCI-DIO-32HS and ports 0 and 1 make up a 16-bit word. I am successfully reading in the data and it is being written to an array of 8-bit values. Element 0 is the LSbyte, 1 is the MSbyte, 2 is the next LSbyte, etc. I then have a loop that uses the "join numbers" vi in Labview. I address element 0 and element 1 with separate vis, and then send the result the join numbers vi to create the 16-bit result (the join numbers vi performs the arithmetic shift for you).
I have a lot of data and this loop takes quite a bit of time. Is there a faster way of doing this? Is there a way to read into into an array with
the 16-bit number already available? I suspect that there may already be a convenient way to avoid this. If not, a function of this type should be added to Labview.
I have looked into the group read vi's, etc., but it seems as if this is the only way to acquire 16-bits of data.

Another and probably faster method to convert the U8 array to a U16 array is to use the Type Cast function(Function Palette>>Advanced>>Data Manipulation) in LV. Simply typecast the U8 array to U16 by passing a U16 array constant into the center input of the Type Cast function.
Christian Loew, CLA
Principal Systems Engineer, National Instruments
Please tip your answer providers with kudos.
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Attachments:
typecast.gif ‏3 KB

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Marc Caubet wrote:
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Join numeric with join numbers function

Hi ! a small question from a guy that didnt use labview for a while !
i need to use the join number function to join two DBL number A and B to form a new number A.B, just like the join numbers function
in the example i would like the results after the join number function to be 1.5
however i understand that the function merge bytes/words together and the result is far from what i expect .... any ways to
A and B are extracted from modbus READ register command and are unsigned 16 bit
seems easy enough but i need a good refreshment on how those bits, bytes and numeric works together.. doh !
thank for everyone involved, Kudos to all labview champions!
Solved!
Go to Solution.
Attachments:
join numbers.png ‏108 KB
test comm.png ‏91 KB

Hi yan,
it seems you really need a refreshment on all those bits/bytes/numeric representations
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OK people whats wrong with this? I use the join numbers primitive and it gives incorrect results. I tried on the desktop version and I get the correct Hi.LO output of 3451263.
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Attachments:
Join Numbers Pics.zip ‏10 KB

I forgot to attach the VI in the zip file
Attachments:
Join Numbers Test.vi ‏11 KB

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lisasmitsky wrote:
So she opens a form for a Tuesday client, the form puts in today's dates, and automatically enters all the Tuesdays for this month.
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Join Numbers VI, 8-bit, 16-bit, etc.

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