Controlling external equipment over GPIB using LabView

Hi All,
I am new to labview and I am trying to control two outputs of HP6624A power supply and one output of Tektronics 2021AWG using labview which I am not bale to do rightly. If some one can help it will be great.
Actually I am trying all this to test an ADC and do some analysis on the results of the same. I have created the VI for analysis and it is working. Now I need to apply supply, clock & data to my device through these equipments. I was initally operating these equipments manually, but now I want to control them using LabView.
I have down loaded the instrument drivers for both of these equipments.
thanks
janit
I am attaching the vi through which I am trying to do so.
Attachments:
Inst_Control.vi ‏21 KB

Basically all of the apps I've had to program have required GPIB communication. I have tried the drivers written by the manufacturers of all the devices, and found it easier to write my own. For instance, to read the value of an Agilent (HP) multimeter, I have the attached vi.
It's easier to use the manual GPIB communication vi's, than it is to have to deal with the ones writting by HP for instance (*In my experience*...it may be different for other people). You have more control over when and what commands are sent.
Attachments:
Read Meter.vi ‏23 KB

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