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low level operation in VEE

Question asked by yhchenzu on May 28, 2011
Latest reply on Jul 12, 2011 by MichaelWatts

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Hi All
I have a problem
I try to use low-level command to control intrument
low-level command contains UNL/MTA/UNT/MLA...
it can send to "*RST" or "OUTPUT ON" or "OUTPUT OFF"
low-level command
MTA
UNL
Listen Address
"*RST"

but when I want to send "READ?" and receive response
it can send "READ?" ,instrument triggers and put result to its buffer.
But ... I don't know how to get the result via GPIB in VEE
any related VEE command can do it ?

thanks ~

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changmeikuan May 29, 2011 7:38 PM
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Are you looking for adding an IO read transaction?

-mk
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- IORead.JPG12.3 KB
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yhchenzu May 30, 2011 6:05 AM
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Hi. MK
thanks of your reply
the IO Transaction is in "Direct IO"?
I need all operation in "interface operations"
^^ thanks~
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changmeikuan May 30, 2011 8:29 PM
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Hi yhchenzu,

I am a little confused what you are trying to do. As of my understanding, if we would like to send interface command e.g. UNL/MTA/UNT/MLA..., we will use Interface Operations from menu IO > Advanced I/O. It will communicate to the bus you selected.

However, to talk to instrument, we will need to use DirectIO (or IVI COM or etc but interface operations.). "*RST", "OUTPUT ON" or "OUTPUT OFF", "READ" should be sent to instrument itself. The GPIB bus is just a shared bus, it won't acquire data for you

Hope this helps

-mk
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yhchenzu Jun 15, 2011 10:23 AM
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Hi. MK
thanks of your reply and let me clear bout that "GPIB is just a bus"

I would like to try PC(A) send a string to PC(B) via GPIB in VEE.
so I try to use low level to study how VEE send and receive from instrument.
:P :P

do you try to do that PC(A) send a string and PC(B) receive ?
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changmeikuan Jul 14, 2011 2:08 AM
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Hi yhchenzu,

Sorry for late reply, I was rushing for projects last few weeks. *whew*
Nope, I have not tried "PC(A) send a string and PC(B) receive"
If to communicate between two PCs, I would maybe consider using SOCKET in VEE

-mk
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MichaelWatts Jul 12, 2011 1:25 AM
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Hi yhchenzu,
I would echo that sentiment: for GPIB, the PC is normally the controller. Trying to make one a slave and dealing with all of the protocol stack is quite a job. GPIB is well established now so doing that sort of task 'just for the fun of it' is probably not worthwhile even from an acedemic point of view. There was SRM - an HP designed ( as far as I know ) network system for HP controllers. A quick search for 'srm hpib' found this link
http://www.hp9845.net/9845/tutorials/networks/ - have a look at the end section "HP-IB Network".

GPIB is still, at least in my opinion, a great way to communicate with instruments in fact we're just putting together a system now with several Agilent units controlled via GPIB.

Communicating between two PCs, or even two VEE programs on the same PC using sockets is a snap. I thought I'd written an example for our website but I haven't. If you want a simple step-by-step guide I'll write you one ( if so, let me know which version of VEE you use ).

HTH, Mike Watts
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