How to check the speed of agilent 34907a

Hope i am not duplicating my previous post.But i am not able to locate my previous post so i assume that it has not been posted yet.
The clarification i want to make is as follws:
I am reading data from a keithley sourcemeter through a GPIB cable and then process it and then write a digital output value to agilent 34907a multifunction module card and write the time ,GPIB data and the digital value into an excel sheet.
i want the whole cycle to run as fast as possible.
So I created a sequence of two frames(ref attached picture ) first frame reads GPIB data and second frame processes the data and writes output to agilent digital output module.
i have put this sequence inside a continous while loop.
There is no delay inserted anywhere.
The excel sheet shows a time difference about 60 msec +/2 sec between consecutive time readings.which means the output module has recieved a data every 60 msec .but i am not sure if it is able to execute the  commands it recieves or some commands ignored.
a.I can see alternate values being written in the display with no error. so does this mean all the write commands are executed?
b.does the nest while loop start only after the end of the write process?
c.Currenly i am using a rs232 cable as interface at 9600 baud rate can increasing this bring down the time from 60 msec?
your help would be highly appreciated 
regards
Siva 
Attachments:
sequence.GIF ‏45 KB

Your previous posting of this question was in the LabWINDOWS forum. You can find any of your previous postings by clicking on your forum "name", it will show you every posting you have made.
I am unable to view your image attachment, it is too low resolution. You can attach source code, if it isn't too large, to your postings, just make sure to identify which version of LabVIEW was used.
 You say that your excel spreadsheet shows a time difference of 60 msec +/2 sec  what does +/2 mean? Plus or minus 2 seconds would be big if the expected/desired loop rate is 60 mS.  I don't know whether any commands are being ignored, you would probably get an error if it wasn't able to execute a command in time. If you are looping at 60 mS you won't be able to visually if a command is dropped, but depending on what it is (like output a level) it probably can handle it, that is only 17 S/sec roughly. The 34907a doesn't have a BW rating for the analog output that I could find, looks like it is expected to be used in more or less a static voltage source mode, but it does spec a 1 mS settling time, which should fall within your limits, assuming you are doing the next in measurement too soon.
Look at your previous post for other comments by another author.
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion

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