Two dc power supply precisely timed switching

Hi,
i am trying to controll switching  between two E3631A DC Power supply with different period,in my programm i am using to timed switching  case structur for controlling DC Power switch,but because of kommunication overhead doesn‘t  timing result  always agree with specified period,how can i modify my code to precisely controll this Switching？if f anyone can give me some ideas that would be appreciated.
Note：Labview 2009 sp1
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Attachments:
power switch.vi ‏70 KB

Dennis_Knutson wrote:
The on/off is part of the Configure Output function with the Enable input. There is going to be some lag between enabling the supplies because the commands will execute sequentially. It might be possible to set them both to software triggering and then issue a GET (Group Execute Trigger) bus command. That would be as close to switching them on at the same time as you are going to get. It has been a while since I've done this. I know the lower level GPIB functions has the TriggerList function for doing this but I'm not sure about VISA.
A hardware switching solution does make more sense here since you seem to desire deterministic timing.  Windows is not going to get you reliable switch timing nor is the devices communications interface (The device needs to receive and process the command before the action is taken.)  Many power supplies also have  hardware trigger inputs and outputs and can be configured to execute actions on these line state transitions.  This gets around all the communications and processing lag of the controller and allows a rapid response. 
Jeff

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