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_viGTL.au3
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2005-02-06
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;- This assumes that you have instrument set to GPIB address 3
; If you have an instrument in a different address change "GPIB::3::0" to the
; corresponding descriptor. Do the same for the call to _viOpen
; It shows how to use the _viGTL function with a VISA descriptor and with a
; VISA device handler. We use _viExecCommand first to force the instrument to go
; into "Remote mode"
#include <Visa.au3>
Dim $h_session = 0
; Query the ID of the instrument in GPIB address 3
MsgBox(0,"Step 1","Simple GPIB query using a VISA Descriptor")
Dim $s_answer = _viExecCommand("GPIB::3::0","*IDN?",10)
MsgBox(0,"GPIB QUERY result",$s_answer) ; Show the answer
MsgBox(0,"Step 2","Go to LOCAL using VISA Descriptor")
_viGTL("GPIB::1::0") ; Go to local (exit remote control mode)
MsgBox(0,"Step 4","Open the instrument connection with _viOpen")
Dim $h_instr = _viOpen(3)
MsgBox(0,"Instrument Handle obtained", "$h_instr = " & $h_instr) ; Show the Session Handle
; Query the instrument
MsgBox(0,"Step 5","Query the instrument using the VISA instrument handle")
$s_answer = _viExecCommand($h_instr,"*IDN?") ; $h_instr is NOT A STRING now!
MsgBox(0,"GPIB QUERY result",$s_answer) ; Show the answer
; Query again. There is no need to OPEN the link again
MsgBox(0,"Step 6","Query again. There is no need to OPEN the link again")
$s_answer = _viExecCommand($h_instr,"*IDN?")
MsgBox(0,"GPIB QUERY result",$s_answer) ; Show the answer
MsgBox(0,"Step 7","Go to LOCAL using VISA instrument handle")
_viGTL($h_instr); Go to local (this is optional)
MsgBox(0,"Step 8","Close the Instrument connection using _viClose")
_viClose($h_instr) ; Close the instrument connection