"Dual loop setting" in MAX

about "Dual loop setting" in my max, why i can't choose it freely. It only have "Dual loop Encoder" without analog feedback at all .
(see in the accessory)
Can anyone tell me the reason?
Thanks a lot
Attachments:
MAX.jpg ‏124 KB

Julianti wrote:
1) I use the shift register just to get the last data, i.e. the VISA resource name. Without the shift register, it is an array and it cannot be wire to the VISA close. This may looks stupid..so what about to avoid the For loop, as in this VI attached? The driver for the oscilloscope is available at http://sine.ni.com/apps/utf8/niid_web_display.model_page?p_model_id=485.
A tunnel coming out of a For loop will often default to an autoindexing tunnel and give you an array. You can right click on that tunnel and select disable indexing to get a normal tunnel coming and not the array. I'm not sure why the need for the For loop, unless you intentionally want to run this code exactly 180 times.
2) I never modify the arrangement of VISA write and VISA read. It is given in the driver for the oscilloscope. So I assume that it is fine. Is this assumption correct?
I don't know. I am used to serial port communication and not GPIB communication, so my reference basis is that where I am used to needing some sort of delay. In a situation like that if you write then read too fast, there is nothing yet to read. But by the time the loop gets around to the next iteration then there would be something in the read buffer but from the previous iteration. I don't know if the mechanics behind GPIB are inherently different than serial.
3) I already put another Tick Count to compare with. Is this what you mean?
Exactly.
I tried to run and it stoped after the VISA close. Then I close the Labview and rerun this VI. The error occured at the VISA write during the first iteration. Then if I change a new GPIB address at the oscilloscope, MAX and the input for VISA session in the VI, then it can run with no error. This is only annoying for this VI but it becomes a real problem when I combine all my sub VI together later.
Thank you for your help..

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http://zone.ni.com/devzone/conceptd.nsf/webmain/E7ABA6F4D569010A86256F5A005B64F3/
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1) I use the shift register just to get the last data, i.e. the VISA resource name. Without the shift register, it is an array and it cannot be wire to the VISA close. This may looks stupid..so what about to avoid the For loop, as in this VI attached? The driver for the oscilloscope is available at http://sine.ni.com/apps/utf8/niid_web_display.model_page?p_model_id=485.
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2) I never modify the arrangement of VISA write and VISA read. It is given in the driver for the oscilloscope. So I assume that it is fine. Is this assumption correct?
I don't know. I am used to serial port communication and not GPIB communication, so my reference basis is that where I am used to needing some sort of delay. In a situation like that if you write then read too fast, there is nothing yet to read. But by the time the loop gets around to the next iteration then there would be something in the read buffer but from the previous iteration. I don't know if the mechanics behind GPIB are inherently different than serial.
3) I already put another Tick Count to compare with. Is this what you mean?
Exactly.
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"Dual loop setting" in MAX

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