Behavior of locking/unlocking of VISA

I'm redrawing the current VISA drivers for several instruments that we use.  Since it is possible that several different screws will want to access the same instrument more or less the same time, I want to block the instrument to ensure that certain operations occur without interruption.

I found Async Lock VISA and VISA Unlock and decided to use them, because they are built and seem like they should do what I am trying to accomplish.  ('Use this function to obtain an exclusive lock that offers unique access to a device or resource.')  However, when I send two commands for a device and deliberately delay the release after the first, while the second command should wait until the first unlocked... I see the effects of these two commands at the same time.  Turning point performance highlight confirms that the second instance of VISA Lock Async runs successfully before the first lock has been released.  And they are configured for exclusive locks, shared locks not.

I've attached a screenshot of an example VI that illustrates this behavior.  I do something wrong, or I somehow misinterpreted the fairly direct language in the documentation of NOR?  Do I need to use semaphores and abandon this cleaner solution?

I think your problem is that you have access to the same resource. Look at the example program called "locking". Here, there are two different resources created.

Tags: NI Hardware

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