Handling multiple buttons

Hello all,
I am working on project to control fluke multimeter. I got the communication and am able to read the values from it and representing the values in graph. Here the problem comes, when i am switching the multimeter to voltmeter,ammeter and ohmmeter it is reperesenting all the values in the single graph. Thats unfair. what i have to do is to seperate the graphs when the event has occured like if i switch to voltmeter it has to get the values in to voltmeter graph and for the others in different graphs w.r.t time.I attached the VI
can anyone give suggestions on this pls!
Thanks
Kumar2249
Attachments:
basic.vi ‏31 KB

Your basic architecture is not set up to allow changes (Volts/Ohms/Amps) after the program is started.
You wait until the user clicks one of those and then you don't pay attention any more.
Usually, you want the EVENT structure to be INSIDE the WHILE loop.
When an event happens, you handle it, and then loop back for another event.
In this case, I would have a TIMEOUT event, so that you can check the serial port every X mSec,
Something like this:
Repeat {while loop }
   case EVENT of
   VOLTS button - Value Change:
   Send command for VOLTS mode to instrument
   Shift Register = 0 (VOLTS mode)
   OHMS button - Value Change
   Send command for OHMS mode to instrument
   Shift Register = 1 (OHMS mode)
   AMPS button - Value Change
   Send command for AMPS mode to instrument
   Shift Register = 2 (AMPS mode)
   TimeOut:
   if Incoming Data
   Process data into numbers.
   case Shift Reg of
   0: Pass number to VOLTS chart
   1: Pass number to OHMS chart
   2: Pass number to AMPS chart
   default: do nothing
   end case
   end if
   Stop Button - Value Change
   Stop Loop
   end case
until Stopped (end loop)
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

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