How to use boolean transition as trigger 0to1= 1impulse, 1to0= 0 impulse

Hello!
I have a boolean button HVenable which will be used to enable/disable the high voltage output of a voltage source.
The problem:
I only need one True value to send the Open HV command
and one False value to send the Close HV command; the boolean button sends a continuous train of True values when it is on and a continuous train of F values when off.
How can I convert a transition from off to on / F to T into a single 1 impulse or T impulse 
and the transition from on to off/ T to F into a single 0 impulse or T impulse.
What instrument converts a transition from F to T into a 1 or T impulse
and a transition from T to F into a 0 impulse (different from the first kind of transition)?
In the attached test vi, such an instrument would be inserted between HVenable button and Select;
when True it will send an open command to visa O 01 CR
when False  it will send a close command O 00 CR.
Solved!
Go to Solution.
Attachments:
bultrig.vi ‏11 KB

First, Do Not Use Continuous Run to make code run more than once! Place the repeating code inside a loop. Continuous Run is a troubleshooting tool to be used (sparingly) during development.
The key to your issue is to use the Event structure. A Value Change event on the HVenable boolean will do exactly what you want.
You do not need Type Cast and all the conversions. Set string constants to '\' Codes display mode and enter the data you want.
Lynn
Attachments:
bultrig.2.vi ‏11 KB

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