DATA manipulation #2

[zhao.lin]

hi everyone,
          my name is zhi. I have asked for help in privous post about data manipulation. I am still waiting for the other respond. however, i need to finish my porject within a week. So I really hope someone can help me to get the correct responds from the sensor.

i am geting the reading from the micro-epsilon sensor , ILD-1800. however, i cannot get a proper reading. i know this is because i am no manipulating the data correctly. Since this is my first time doing it. i have no idea which way is the correct way to.  Plus, no one i our school know how to do data manipulation in Labview. please help.

I have an screenshot , VI, and manufacture manual (please take a look at page 31) in attachment.
thanks in advance.


zhi

[Wayne.C]

zhi,

Your screen shot shows the incorrect result.  What kind of result were you expecting?

[zhao.lin]

Our expected value should be like 1.22222 mm. Although the manitube doesnt matter. The problem is when I place the gage block under the sensor, it reading keep fluctuating.  Even when I send a STOP command to sensor, it still keep outputing the data. This is what my problem is.

[Wayne.C]

I think I found the problem.  I have posted a picture of what your bit manipulation should look like.  When you convert a number to a boolean array, index 0 of the array represents bit 0 of the number.   You had this reversed in several places.

[smercurio_fc]

You can do the bit manipulation without having to deal with arrays (aside from the initial one to get the 2 bytes):






Message Edited by smercurio_fc on 04-24-2008 02:06 PM

[Wayne.C]

smercurio,

5 stars for some sweet bit manipulation!

[zhao.lin]

smercurio and centerbolt,
           For smercurio's solution,  I  do not know what function they are, such as fing the V16 in the function pellete, and other function.  can any of you help me with that?

sincerely

zhi

[smercurio_fc]

Those functions are in the Numeric -> Data Manipulation palette. Attached is the VI of the example I posted. You can just copy and paste the code.

[pallen]

Hi Zhi,

I'm guessing you're looking for the Join Numbers and the Logical Shift. 

I'll post some screenshots that show where they are.






Message Edited by pallen on 04-24-2008 03:46 PM

[zhao.lin]

Thanks for all your help.

I have try smercurio's VI,  it woks, but not the number I want. I am sure that the way you are tell me is correct. I am just wandering if i have confused or mix any concept in get the the data, can anyone take a look at the manual and tell me what happend? Please. Becuase my lack of knowledge. Thanks



since I am using the VISA serial read. I am wandering if the number of "Bytes read" matter  affect the number that we get ?


Message Edited by zhao.lin on 04-24-2008 03:01 PM

Message Edited by zhao.lin on 04-24-2008 03:02 PM