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_viOpen.au3
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2005-02-06
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;- This assumes that you have instrument set to GPIB address 1
; It shows how to use the _viExecCommand function in stand alone mode and combined
; with _viOpen and _viClose.
; It also shows the _viGTL function
#include <Visa.au3>
Dim $h_session = 0
; Query the ID of the instrument in GPIB address 3
MsgBox(0,"Step 1","Open the instrument connection with _viOpen")
Dim $h_instr = _viOpen("GPIB::3::0")
MsgBox(0,"Instrument Handle obtained", "$h_instr = " & $h_instr) ; Show the Session Handle
; Query the instrument
MsgBox(0,"Step 2","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 3","Query again. There is no need to OPEN the link again")
$s_answer = _viExecCommand($h_instr,"*IDN?")
MsgBox(0,"GPIB QUERY result",$s_answer) ; Show the answer
MsgBox(0,"Step 4","Close the instrument connection using _viClose")
_viClose($h_instr) ; Close the instrument connection
MsgBox(0,"Step 5","Open the Instrument connection using only the address number")
Dim $h_instr = _viOpen(3)
MsgBox(0,"Instrument Handle obtained", "$h_instr = " & $h_instr) ; Show the Session Handle
; Query the instrument
MsgBox(0,"Step 6","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 7","Query again. There is no need to OPEN the link again")
$s_answer = _viExecCommand($h_instr,"*IDN?")
MsgBox(0,"GPIB QUERY result",$s_answer) ; Show the answer
MsgBox(0,"Step 8","Close the instrument connection using _viClose")
_viClose($h_instr) ; Close the instrument connection