Handle sequence of actions with callbacks

I am programming a measurement sequence involving readings from a DVM (Keithley 2002) and activating switches on the 2002 and on another instrument.
The readings are for temperature (potentiometric across a reference and a probe, so it involves several voltage readings and switch activations), as well as voltage across several channels. They use the same instrument in the same mode (DCV).
There is a specific measurment sequence I need to keep (voltage1, voltage 2, temperature, voltage 3, ...).
The DVM is set up with an integration time of about 1 s, so there is some idle time from triggering to reading ready, where processing or user events could be handled, but I need to be able to return to the point in the main sequence (or the temperature measurement sequence) from where I came.
So presently I have the reading routine just call the (hierachy) of subroutines for temperature and voltage, and when reading voltage, circle in a loop checking the STB, because I do not really know how to handle it by using a CallBack (how to "get back" to the correct place in the sequence).
In other situations I have used a global status variable and a switch statement in the main routine, and have the function getting the reading, change the status variable and then post a deferred call to the main sequence routine before it returns, but here it would require several levels and a LOT of states.
I have looked for a "standard" LabWindows way of doing this, but not really found anything.
Any help is appreciated, e.g. pointers to examples
Thanks

Hello HDJ,
I don't know how your code (especially your main function) currently looks like, but there are a few useful things you do/use.
Using a state machine like approach would indeed be a good start, but of course you would like to maintain a responsive User Interface (eg. stop/abort buttons).
What you could do is the following:
- Implement your state machine in a separate thread (for example by using the functions Anders has shown).
- Make your "state machine thread/loop” driven by thread safe queues (http://zone.ni.com/reference/en-XX/help/370051Y-01/cvi/programmerref/threadsafequeue/)
This allows you to:
1) receive queue elements from the UI (callbacks)
2) receive queue elements from the state machine itself
3) receive queue elements from any other parallel thread (including other acquisition related callbacks).
- Provide the necessary states in this state machine to handle both User Interaction (eg. stop/abort ) as well as the continuation from step 1 to step 2 and so on.
This includes but is not limited to an abort state, init state, DoStepX state, Waiting for response state(s)…
To be able to give you some more precise information I would like to ask you if you can give more information concerning the following things?
- Are you currently working on a fixed order and functionality sequence (always step A first, then step B , then step C, etc..) ?
Or is the order of the different steps (and if they should be executed or not) in your sequence dependent on the result of each (or multiple) step(s)?
- Do you have multiple versions of the sequence that use the same steps (in a different order) or do you only have 1 possible sequence?
- How does a current (working) implementation of your sequencer look like?
(this can be shown in pseudo code) This can give a better idea of what could be improved and which limitations are imposed upon it.
Kind Regards,
Thierry C - Applications Engineering Specialist Northern European Region - National Instruments
CLD, CTA
If someone helped you, let them know. Mark as solved and/or give a kudo.

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