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; Include Version:1.66 (17 July 2006)
#include-once
; ------------------------------------------------------------------------------
;
; AutoIt Version: 3.0
; Language: English
; Description: VISA (GPIB & TCP) library for AutoIt
; Functions that allow controlling instruments (e.g. oscilloscopes,
; signal generators, spectrum analyzers, power supplies, etc)
; that have a GPIB or Ethernet port through the VISA interface
; (GPIB, TCP or Serial Interface)
; Limitations: The VISA queries only return the 1st line of the device answer
; This is not a problem in most cases, as most devices will always
; answer with a single line.
; Notes:
; If you are interested in this library you probably already know
; what is VISA and GPIB, but here there is a short description
; for those that don't know about it:
;
; Basically GPIB allows you to control instruments like Power
; Supplies, Signal Generators, Oscilloscopes, Signal Generators, etc.
; You need to install or connect a GPIB interface card (PCI, PCMCIA
; or USB) to your PC and install the corresponding GPIB driver.
;
; VISA is a standard API that sits on top of the GPIB driver and
; it allows you to use the same programs to control your
; instruments regardless of the type of GPIB card that you have
; installed in your PC (most cards are made either by National
; Instruments(R) or by Agilent/Hewlett-Packard(R)).
;
; This library is that it opens AutoIt to a different kind of
; automation (instrument automation). Normally you would need to
; use some expensive "instrumentation" environment like
; Labwindows/CVI (TM), LabView (TM) or Matlab (TM) to automate
; instruments but now you can do so with AutoIt.
; The only requirement is that you need a VISA compatible GPIB
; card (all cards that I know are) and the corresponding VISA
; driver must be installed (look for visa32.dll in the
; windows\system32 folder).
;
; Basically you have 4 main functions:
; _viExecCommand - Executes commands and queries through GPIB
; _viOpen, _viClose - Open/Close a connection to a GPIB instrument.
; _viFindGpib - Find all the instruments in the GPIB bus
;
; There are other less important functions, like:
; _viGTL - Go to local mode (exeit the "remote control mode")
; _viGpibBusReset - Reset the GPIB bus if it is in a bad state
; _viSetTimeout - Sets the GPIB Query timeout
; _viSetAttribute - Set any VISA attribute
;
; There is one known limitation of this library:
; - The GPIB queries do not support binary transfer.
;
; It is recommended that you try first to execute the _viFindGpib
; function (as shown in the example in the _viFindGpib header)
; and see if you can find any instruments. You can also have a
; look at the examples in the _viExecCommand function description.
;
; ==============================================================================
; VERSION DATE DESCRIPTION
; ------- ---------- -----------------------------------------------------
; v1.0.00 02/01/2005 Initial release
; v1.0.01 02/06/2005 Formatted according to Standard UDF rules
; Fixed _viGpibBusReset
; Renamed _viFindGPIB to _viFindGpib
; Removed unnecessary MsgBox calls
; More detailed function headers
; Added Serial Interface related Attribute/Value Constants
; v1.0.02 02/11/2005 Fixed _viQueryf only executing "*IDN?" queries
; Fixed _viQueryf only returning characters up to the first space
; Fixed _viQuertf returning only first line of answer
; Added _viInterativeControl for interactive VISA control
; Added GPIB message termination attributes
; ------------------------------------------------------------------------------
; ==============================================================================
;- VISA Definitions ------------------------------------------------------------
; The VISA library requires some GLOBAL CONSTANTS and VARIABLES that are defined
; here:
;- VISA CONSTANTS -------------------------------------------------------------
Global Const $VI_SUCCESS = 0 ; (0L)
Global Const $VI_NULL = 0
Global Const $VI_TRUE = 1
Global Const $VI_FALSE = 0
;- VISA GPIB BUS control macros (for _viGpibControlREN, see below) -------------
Global Const $VI_GPIB_REN_DEASSERT = 0
Global Const $VI_GPIB_REN_ASSERT = 1
Global Const $VI_GPIB_REN_DEASSERT_GTL = 2
Global Const $VI_GPIB_REN_ASSERT_ADDRESS = 3
Global Const $VI_GPIB_REN_ASSERT_LLO = 4
Global Const $VI_GPIB_REN_ASSERT_ADDRESS_LLO = 5
Global Const $VI_GPIB_REN_ADDRESS_GTL = 6
;- VISA interface ATTRIBUTE NAMES ----------------------------------------------
; General Attributes
Global Const $VI_ATTR_TMO_VALUE = 0x3FFF001A
; Serial Interface related Attributes
Global Const $VI_ATTR_ASRL_BAUD = 0x3FFF0021
Global Const $VI_ATTR_ASRL_DATA_BITS = 0x3FFF0022
Global Const $VI_ATTR_ASRL_PARITY = 0x3FFF0023
Global Const $VI_ATTR_ASRL_STOP_BITS = 0x3FFF0024
Global Const $VI_ATTR_ASRL_FLOW_CNTRL = 0x3FFF0025
; GPIB message termination attributes
Global $VI_ATTR_TERMCHAR = 0x3FFF0018
Global $VI_ATTR_TERMCHAR_EN = 0x3FFF0038
Global $VI_ATTR_SEND_END_EN = 0x3FFF0016
; NOTE: There are more attribute types. Please refer to the VISA Programmer's Guide
;- VISA interface ATTRIBUTE VALUES ---------------------------------------------
;* TIMEOUT VALUES:
Global Const $VI_TMO_IMMEDIATE = 0
Global Const $VI_TMO_INFINITE = 0xFFFFFFF
; Serial Interface related Attribute Values
Global Const $VI_ASRL_PAR_NONE = 0
Global Const $VI_ASRL_PAR_ODD = 1
Global Const $VI_ASRL_PAR_EVEN = 2
Global Const $VI_ASRL_PAR_MARK = 3
Global Const $VI_ASRL_PAR_SPACE = 4
Global Const $VI_ASRL_STOP_ONE = 10
Global Const $VI_ASRL_STOP_ONE5 = 15
Global Const $VI_ASRL_STOP_TWO = 20
Global Const $VI_ASRL_FLOW_NONE = 0
Global Const $VI_ASRL_FLOW_XON_XOFF = 1
Global Const $VI_ASRL_FLOW_RTS_CTS = 2
Global Const $VI_ASRL_FLOW_DTR_DSR = 4
; NOTE: There are more attribute values. Please refer to the VISA Programmer's Guide
;- VISA Global variable(s) -----------------------------------------------------
; The VISA Resource Manager is used by the _viOpen functions (see below)
; This is the only (non constant) Global required by this library
Global $VISA_DEFAULT_RM = -1
; ==============================================================================
;- Main VISA/GPIB functions ----------------------------------------------------
; These include _viExecCommand, _viOpen, _viClose and _viFindGpib
;===============================================================================
;
; Description: MAIN FUNCTION - Send a Command/Query to an Instrument/Device
; Syntax: _viExecCommand($h_session, $s_command, $i_timeout_ms = -1)
; Parameter(s): $h_session - A VISA descriptor (STRING) OR a VISA session handle (INTEGER)
; * STRING -> A VISA DESCRIPTOR is a string which
; specifies the resource with which to establish a
; communication session. An example descriptor is
; "GPIB::20::0". This function supports all valid
; VISA descriptors, including GPIB, TCP, VXI and
; Serial Interface instruments. A detailed explanation
; of VISA descriptors is shown in the Notes section
; of this function.
; As a SHORTCUT you can use a STRING containing
; the address number (e.g. "20") of a GPIB
; instrument instead of typing the full descriptor
; (in that case, "GPIB::20::0")
; * INTEGER -> A VISA session handle is an integer
; value returned by _viOpen (see below).
; It is recommended that instead you use _viOpen
; and VISA session handles instead of descriptors
; if you plan to communicate repeteadly with an
; Instrument or Device, as otherwise each time that
; you contact the instrument you would incur the
; overhead of opening and closing the communication
; link.
; Once you are done using the instrument you must
; remember to close the link with _viClose (see below)
; $s_command - Command/Query to execute.
; A query MUST contain a QUESTION MARK (?)
; When the command is a QUERY the function will
; automatically wait for the instrument's answer
; (or until the operation times out)
; $i_timeout_ms - The operation timeout in MILISECONDS
; This is mostly important for QUERIES only
; This is an OPTIONAL PARAMETER.
; If it is not specified the last set timeout will
; be used. If it was never set before the default
; timeout (which depends on the VISA implementation)
; will be used. Timeouts can also be set separatelly
; with the _viSetTimeout function (see below)
; $s_mode - Control the mode in which the VISA viPrintf is called
; This is an OPTIONAL PARAMETER.
; Check the _viPrintf help for more info on
; this OPTIONAL PARAMETER (whose default value is @LF)
; This is normally NOT necessary and should only be set
; if your GPIB card or instrument require it.
; Requirement(s): The VISA libraries must be installed (you can check whether
; visa32.dll is in {WINDOWS}\system32)
; For GPIB communication a GPIB card (such as a National Instruments
; NI PCI-GPIB card or an Agilent 82350B PCI High-Performance GPIB card
; Return Value(s): The return value depends on whether the command is a QUERY
; or not and in whether the operation was successful or not.
;
; * Command, NON QUERY:
; On Success - Returns ZERO
; On Failure - Returns -1 if the VISA DLL could not be open
; or a NON ZERO value representing the VISA
; error code (see the VISA programmer's guide)
; * QUERY:
; On Success - Returns the answer of the instrument to the QUERY
; On Failure - Returns -1 if the VISA DLL could not be open
; Returns -3 if the VISA DLL returned an unexpected
; number of results
; or returns a NON ZERO value representing the VISA
; error code (see the VISA programmer's guide)
;
; This function always sets @error to 1 in case of error
; Author(s): Angel Ezquerra <ezquerra at gmail dot com>
; Example(s):
; - Simple communication examples:
; Get instrument ID:
; $s_idn = _viExecCommand("GPIB::20::0","*IDN?")
; This is the same as:
; $s_idn = _viExecCommand("20","*IDN?") -> Note that "20" is a STRING
;
; - More efficient way to communicate many times
; You must use _viOpen and _viClose
; In this example we measure a POWER 100 times:
; $h_session = _viOpen("GPIB::1::0") ; or $h_session = _viOpen("1")
; For $n = 0 To 99
; $power_array[$n] = _viExecCommand($h_session,"POWER?")
; Next
; _viClose($h_session)
;
; A more complex example, using 2 instruments, a signal generator
; and a spectrum analyzer, to measure the average power error of
; the generator:
;
; $h_spec_analyzer = _viOpen("GPIB::1::0") ; or $h_session = _viOpen("1")
; $h_signal_gen = _viOpen("GPIB::12::0") ; or $h_session = _viOpen("1")
; $average_power_error = 0
; For $ideal_power = -100 To -10 ; dBM
; _viExecCommand($h_signal_gen,"SOURCE:POWER " & $ideal_power & "dBm")
; $current_power_error = Abs($ideal_power - _viExecCommand($h_spec_analyzer,"POWER?"))
; $average_power_error = $average_power_error + $current_power_error
; Next
; $average_power_error = $average_power_error / 91
; _viClose($h_spec_analyzer)
; _viClose($h_signal_gen)
;
; Note(s):
; The following is a description of the MOST COMMON VISA DESCRIPTORS
; Note that there are some more types. For more info please
; refer to a VISA programmer's guide (available at www.ni.com)
; Optional segments are shown in square brackets ([]).
; Required segments that must be filled in are denoted by angle
; brackets (<>).
;
; Interface Syntax
; ------------------------------------------------------------
; GPIB INSTR GPIB[board]::primary address
; [::secondary address] [::INSTR]
; GPIB INTFC GPIB[board]::INTFC
; TCPIP SOCKET TCPIP[board]::host address::port::SOCKET
; Serial INSTR ASRL[board][::INSTR]
; PXI INSTR PXI[board]::device[::function][::INSTR]
; VXI INSTR VXI[board]::VXI logical address[::INSTR]
; GPIB-VXI INSTR GPIB-VXI[board]::VXI logical address[::INSTR]
; TCPIP INSTR TCPIP[board]::host address[::LAN device name]
; [::INSTR]
;
; The GPIB keyword is used for GPIB instruments.
; The TCPIP keyword is used for TCP/IP communication.
; The ASRL keyword is used for serial instruments.
; The PXI keyword is used for PXI instruments.
; The VXI keyword is used for VXI instruments via either embedded
; or MXIbus controllers.
; The GPIB-VXI keyword is used for VXI instruments via a GPIB-VXI
; controller.
;
; The default values for optional parameters are shown below.
;
; Optional Segment Default Value
; ---------------------------------------
; board 0
; secondary address none
; LAN device name inst0
;
;
; Example Resource Strings:
; --------------------------------------------------------------
; GPIB::1::0::INSTR A GPIB device at primary address 1 and
; secondary address 0 in GPIB interface 0.
;
; GPIB2::INTFC Interface or raw resource for GPIB
; interface 2.
;
; TCPIP0::1.2.3.4::999::SOCKET Raw TCP/IP access to port 999
; at the specified IP address.
;
; ASRL1::INSTR A serial device attached to interface
; ASRL1. VXI::MEMACC Board-level register
; access to the VXI interface.
;
; PXI::15::INSTR PXI device number 15 on bus 0.
;
; VXI0::1::INSTR A VXI device at logical address 1 in VXI
; interface VXI0.
;
; GPIB-VXI::9::INSTR A VXI device at logical address 9 in a
; GPIB-VXI controlled system.
;
;===============================================================================
Func _viExecCommand($h_session, $s_command, $i_timeout_ms = -1, $s_mode = @LF)
If StringInStr($s_command,"?") == 0 Then
; The Command is NOT a QUERY
Return _viPrintf($h_session, $s_command, $i_timeout_ms, $s_mode)
Else
; The Command is a QUERY
Return _viQueryf($h_session, $s_command, $i_timeout_ms)
EndIf
EndFunc
;===============================================================================
;
; Description: Opens a VISA connection to an Instrument/Device
; Syntax: _viOpen($s_visa_address, $s_visa_secondary_address = 0)
; Parameter(s): $s_visa_address - A VISA resource descriptor STRING (see the
; NOTES of _viExecCommand above for more info)
; As as shortcut you can also directly pass a GPIB address as
; an integer
; $s_visa_secondary_address - Some GPIB instruments have
; secondary addresses. This parameter is ZERO by default, which
; means NO SECONDARY ADDRESS.
; Only use this optional parameter if the primary address is
; passed as an integer
; Requirement(s): The VISA libraries must be installed (you can check whether
; visa32.dll is in {WINDOWS}\system32)
; For GPIB communication a GPIB card (such as a National Instruments
; NI PCI-GPIB card or an Agilent 82350B PCI High-Performance GPIB card
; Return Value(s): On Success - Returns a (POSITIVE) VISA Instrument Handle
; On Failure - Returns -1 and SETS @error to 1
; Author(s): Angel Ezquerra <ezquerra at gmail dot com>
; Note(s): For simple usage there is no need to use this function, as
; _viExecCommand automatically opens/closes a VISA connection
; if you pass it a VISA resource descriptor (see the NOTES of
; _viExecCommand above for more info)
;
; However, if you want to repeteadly send commands/queries to
; a device, you should call this function followed by using the
; returned instrument handle instead of the VISA descriptor
;
; Do not forget to use _viClose when you are done, though
;
;===============================================================================
Func _viOpen($s_visa_address, $s_visa_secondary_address = 0)
Local $h_session = -1 ; The session handle by default is invalid (-1)
If IsNumber($s_visa_address) Or StringInStr($s_visa_address,"::") == 0 Then
; We passed a number => Create the VISA string:
$s_visa_address = "GPIB0::" & $s_visa_address & "::" & $s_visa_secondary_address
EndIf
;- Do not open an instrument connection twice
; TODO
;- Make sure that there is a Resource Manager open (Note: this will NOT open it twice!)
_viOpenDefaultRM()
;- Open the INSTRUMENT CONNECTION
; errStatus = viOpen (VISA_DEFAULT_RM, "GPIB0::20::0", VI_NULL, VI_NULL, &h_session);
; signed int viOpen(unsigned long, char*, unsigned long, unsigned long, *unsigned long)
Local $a_results
$a_results = DllCall("visa32.dll", "long","viOpen", "long", $VISA_DEFAULT_RM, "str",$s_visa_address, "long",$VI_NULL, "long",$VI_NULL,"long_ptr",-1)
If @error <> 0 Then
; Could not open VISA (visa32.dll)
;MsgBox(16,"_viOpen - DllCall error","Could not open VISA (visa32.dll)")
Return -1
EndIf
Local $errStatus = $a_results[0]
If $errStatus <> 0 Then
; Could not open VISA instrument/resource
SetError(1)
;MsgBox(16,"VISA error","Could not open VISA instrument/resource: " & $s_visa_address)
Return -2
EndIf
; Make sure that the DllCall returned enough values
If UBound($a_results) < 6 Then
SetError(1)
;MsgBox(16,"VISA error","Call to viOpen did not return the right number of values")
Return -3
EndIf
$h_session = $a_results[5]
If $h_session <= 0 Then
; viOpen did not return a valid handle
SetError(1)
;MsgBox(16,"VISA error","viOpen did not return a valid handle")
Return -4
EndIf
; We have a valid handle for the device
Return $h_session
EndFunc
;===============================================================================
;
; Description: Closes a VISA connection to an Instrument/Device
; Syntax: _viClose($h_session)
; Parameter(s): $h_session - A VISA session handle (as returned by _viOpen)
; Requirement(s): The VISA libraries must be installed (you can check whether
; visa32.dll is in {WINDOWS}\system32)
; For GPIB communication a GPIB card (such as a National Instruments
; NI PCI-GPIB card or an Agilent 82350B PCI High-Performance GPIB card
; Return Value(s): On Success - Returns 0
; On Failure - Returns -1 if the VISA DLL could not be open
; or a NON ZERO value representing the VISA
; error code (see the VISA programmer's guide)
; Author(s): Angel Ezquerra <ezquerra at gmail dot com>
; Note(s): For simple usage there is no need to use this function, as
; _viExecCommand automatically opens/closes a VISA connection
; if you pass it a VISA resource descriptor (see the NOTES of
; _viExecCommand above for more info)
;
; However, if you want to repeteadly send commands/queries to
; a device, you should use _viOpen followed by using the
; returned instrument handle instead of the VISA descriptor
; and then calling this function
;
;===============================================================================
Func _viClose($h_session)
;- Close INSTRUMENT Connection
; viClose(h_session);
Local $a_results
$a_results = DllCall("visa32.dll", "int","viClose", "int",$h_session)
If @error <> 0 Then
;MsgBox(16,"_viClose - DllCall error","Could not open VISA (visa32.dll)")
Return -1
EndIf
Local $errStatus = $a_results[0]
If $errStatus <> 0 Then
; Could not close VISA instrument/resource
SetError(1)
;MsgBox(16,"VISA error","Could not close VISA instrument/resource: " & $h_session)
Return $errStatus
EndIf
Return 0
EndFunc
;===============================================================================
;
; Description: Find all the DEVICES found in the GPIB bus
; Syntax: _viFindGpib(ByRef $a_descriptor_list, ByRef $a_idn_list, $f_show_search_results = 0)
; Parameter(s): $a_descriptor_list (ByRef) - RETURNS an array of the VISA resource
; descriptors (see the NOTES of _viExecCommand above for more
; info) of the instruments that were found in the GPIB bus
; $a_idn_list (ByRef) - RETURNS an array of the IDNs (i.e names)
; of the instruments that were found in the GPIB bus
; $f_show_search_results - If 1 a message box showing the
; results of the search will be shown
; The default is 0, which means that the results are not shown
; Requirement(s): The VISA libraries must be installed (you can check whether
; visa32.dll is in {WINDOWS}\system32)
; For GPIB communication a GPIB card (such as a National Instruments
; NI PCI-GPIB card or an Agilent 82350B PCI High-Performance GPIB card
; Return Value(s): On Success - The number of instruments found (0 or more)
; On Failure - Returns a NEGATIVE value and SETS @error to 1
; Author(s): Angel Ezquerra <ezquerra at gmail dot com>
; Example(s):
; ; This example performs a search on the GPIB bus and shows the results in a MsgBox
; Dim $a_descriptor_list[1], $a_idn_list[1]
; _viFindGpib($a_descriptor_list, $a_idn_list, 1)
;
; Note(s): For simple usage there is no need to use this function, as
; _viExecCommand automatically opens/closes a VISA connection
; if you pass it a VISA resource descriptor (see the NOTES of
; _viExecCommand above for more info)
;
; However, if you want to repeteadly send commands/queries to
; a device, you should call this function followed by using the
; returned instrument handle instead of the VISA descriptor
;
; Do not forget to use _viClose when you are done, though
;
;===============================================================================
Func _viFindGpib(ByRef $a_descriptor_list, ByRef $a_idn_list, $f_show_search_results = 0)
;- Make sure that there is a Resource Manager open (Note: this will NOT open it twice!)
_viOpenDefaultRM()
; Create the GPIB instrument list and return the 1st instrument descriptor
; viStatus viFindRsrc (viSession, char*, *ViFindList, *ViUInt32, char*);
; errStatus = viFindRsrc (VISA_DEFAULT_RM, "GPIB?*INSTR", &h_current_instr, &num_matches, s_found_instr_descriptor);
Local $a_results = DllCall("visa32.dll", "long","viFindRsrc", _
"long", $VISA_DEFAULT_RM, "str","GPIB?*INSTR", "long_ptr",-1, _
"int_ptr",-1, "str","")
If @error <> 0 Then
; Could not open VISA (visa32.dll)
;MsgBox(16,"_viFindGpib - DllCall error","Could not open VISA (visa32.dll)")
Return -1
EndIf
Local $errStatus = $a_results[0]
If $errStatus <> 0 Then
; Could not perform GPIB FIND operation
SetError(1)
;MsgBox(16,"VISA error","Could not perform GPIB FIND operation")
Return -2
EndIf
; Make sure that the DllCall returned enough values
If UBound($a_results) < 5 Then
SetError(1)
;MsgBox(16,"VISA error","Call to viFindRsrc did not return the right number of values")
Return -3
EndIf
; Assign the outputs of the DllCall
Local $h_list_pointer = $a_results[3] ; The pointer to the list of found instruments
Local $i_num_instr = $a_results[4] ; The number of instruments that were found
Local $s_first_descriptor = $a_results[5] ; The descriptor of the first instrument found
If $i_num_instr < 1 Then ; No insturments were found
If $f_show_search_results == 1 Then
MsgBox(64,"GPIB search results","NO INSTRUMENTS FOUND in the GPIB bus")
EndIf
Return $i_num_instr
EndIf
; At least 1 instrument was found
ReDim $a_descriptor_list[$i_num_instr], $a_idn_list[$i_num_instr]
$a_descriptor_list[0] = $s_first_descriptor
; Get the IDN of the 1st instrument
$a_idn_list[0] = _viExecCommand($s_first_descriptor,"*IDN?")
; Get the IDN of all the remaining instruments
For $n=1 To $i_num_instr-1
; If more than 1 instrument was found, get the handle of the next instrument
; and get its IDN
;- Get the handle and descriptor of the next instrument in the GPIB bus
; We do this by calling "viFindNext"
; viFindNext (*ViFindList, char*);
; viFindNext (h_current_instr,s_found_instr_descriptor);
$a_results = DllCall("visa32.dll", "long","viFindNext", "long",$h_list_pointer, "str","")
If @error <> 0 Then
; Could not open VISA (visa32.dll)
;MsgBox(16,"_viFindGpib - DllCall error","Could not open VISA (visa32.dll)")
Return -1
EndIf
$errStatus = $a_results[0]
If $errStatus <> 0 Then
; Could not perform GPIB FIND NEXT operation
SetError(1)
;MsgBox(16,"VISA error","Could not perform GPIB FIND NEXT operation")
Return -2
EndIf
; Make sure that the DllCall returned enough values
If UBound($a_results) < 3 Then
SetError(1)
;MsgBox(16,"VISA error","Call to viFindNext did not return the right number of values")
Return -3
EndIf
$a_descriptor_list[$n] = $a_results[2]
$a_idn_list[$n] = _viExecCommand($a_descriptor_list[$n],"*IDN?")
Next
If $f_show_search_results == 1 Then
; Create the GPIB instrument list and show it in a MsgBox
Local $s_search_results = ""
For $n=0 To $i_num_instr-1
$s_search_results = $s_search_results & $a_descriptor_list[$n] & " - " & $a_idn_list[$n] & @CR
Next
MsgBox(64,"GPIB search results",$s_search_results)
EndIf
Return $i_num_instr
EndFunc
;===============================================================================
;- Internal VISA functions, used by _viExecCommand, _viOpen and/or _viClose ----
; The functions in this section are not meant to be called outside this library
; under normal use
;===============================================================================
;
; Description: Open the VISA Resource Manager
; Syntax: _viOpenDefaultRM()
; Parameter(s): None
; Requirement(s): The VISA libraries must be installed (you can check whether
; visa32.dll is in {WINDOWS}\system32)
; For GPIB communication a GPIB card (such as a National Instruments
; NI PCI-GPIB card or an Agilent 82350B PCI High-Performance GPIB card
; Return Value(s): On Success - The Default Resource Manager Handle (also stored
; in the $VISA_DEFAULT_RM global)
; On Failure - Returns -1 if the VISA DLL could not be open
; Returns -2 if there was an error opening the
; Default Resource Manager
; Returns -3 if the returned Resource Manager is
; invalid
; This function always sets @error to 1 in case of error
; Author(s): Angel Ezquerra <ezquerra at gmail dot com>
; Note(s): You should not need to directly call this function under
; normal use as _viOpen calls it when necessary
;
;===============================================================================
Func _viOpenDefaultRM()
Local $h_visa_rm = $VISA_DEFAULT_RM
If $VISA_DEFAULT_RM < 0 Then
; Only open the Resource Manager once (i.e. when $VISA_DEFAULT_RM is still -1)
$h_visa_rm = $VISA_DEFAULT_RM ; Initialize the output result with the default value (-1)
; errStatus = viOpenDefaultRM (&VISA_DEFAULT_RM);
; signed int viOpenDefaultRM(*unsigned long)
Local $a_results
$a_results = DllCall("visa32.dll", "int","viOpenDefaultRM", "int_ptr",$VISA_DEFAULT_RM)
If @error <> 0 Then
; Could not open VISA (visa32.dll)
;MsgBox(16,"_viOpenDefaultRM - DllCall error","Could not open VISA (visa32.dll)")
Return -1
EndIf
Local $errStatus = $a_results[0]
If $errStatus <> 0 Then
; Could not create VISA Resource Manager
SetError(1)
;MsgBox(16,"VISA error","Could not create VISA Resource Manager")
Return -2
EndIf
; Everything went fine => Set the Resource Manager global
$VISA_DEFAULT_RM = $a_results[1]
If $VISA_DEFAULT_RM <= 0 Then
; There was an error, reset the $VISA_DEFAULT_RM
$VISA_DEFAULT_RM = -1 ; Default value
SetError(1)
Return -3
EndIf
$h_visa_rm = $VISA_DEFAULT_RM
EndIf
Return $h_visa_rm
EndFunc
;===============================================================================
;
; Description: Send a COMMAND (NOT a QUERY) to an Instrument/Device
; Syntax: _viPrintf($h_session, $s_command, $i_timeout_ms = -1)
; Parameter(s): $h_session - A VISA descriptor (STRING) OR a VISA session handle (INTEGER)
; Look at the _viExecCommand function for more
; details
; $s_command - Command/Query to execute.
; A query MUST contain a QUESTION MARK (?)
; When the command is a QUERY the function will
; automatically wait for the instrument's answer
; (or until the operation times out)
; $i_timeout_ms - The operation timeout in MILISECONDS
; This is mostly important for QUERIES only
; This is an OPTIONAL PARAMETER.
; If it is not specified the last set timeout will
; be used. If it was never set before the default
; timeout (which depends on the VISA implementation)
; will be used. Timeouts can also be set separatelly
; with the _viSetTimeout function (see below).
; Depending on the bus type (GPIB, TCP, etc) the
; timeout might not be set to the exact value that
; you request. Instead the closest valid timeout
; bigger than the one that you requested will be used.
; $s_mode - Control the mode in which the VISA viPrintf is called
; This is an OPTIONAL PARAMETER
; The DEFAULT VALUE is @LF, which means "attach @LF mode".
; Some instruments and in particular many GPIB cards
; Do not honor the terminator character attribute
; In those cases an @LF terminator needs to be added.
; As this is the most common case, by default the mode
; is set to @LF, which appends @LF to the SCPI command
; You can also set this mode to @CR and @CRLF if your card
; uses those terminators.
; If you do not want to use a terminator, set this parameter
; to an empty string ("")
; Also, some cards support the execution of a "sprintf" on the
; SCPI string prior to sending it through the VISA interface.
; For those who do, it is possible, by setting this
; parameter to "str" to "protect" the VISa interface from
; accidentally applying an escape sequence when a "/" is
; found within the VISA command string.
; This is normally NOT necessary and should only be set
; if your GPIB card or instrument require it.
; Requirement(s): The VISA libraries must be installed (you can check whether
; visa32.dll is in {WINDOWS}\system32)
; For GPIB communication a GPIB card (such as a National Instruments
; NI PCI-GPIB card or an Agilent 82350B PCI High-Performance GPIB card
; Return Value(s): On Success - Returns ZERO
; On Failure - Returns -1 if the VISA DLL could not be open
; or a NON ZERO value representing the VISA
; error code (see the VISA programmer's guide)
; This function always sets @error to 1 in case of error
; Author(s): Angel Ezquerra <ezquerra at gmail dot com>
; Note(s):
; Normally you do not need to use this function,
; as _viExecCommand automatically choses between _viPrintf and
; _viQueryf depending on the command type.
;
; If you need to use it anyway, it is recommended that you do
; not use this command for sending QUERIES, only for GPIB
; commands that DO NOT RETURN AN ANSWER
;
; Also, this is not really a "PRINTF-like" function, as it
; does not allow you to pass multiple parameters. This is only
; called _viPrintf because it uses the VISA function viPrintf
;
; See _viExecCommand for more details
;
;===============================================================================
Func _viPrintf($h_session, $s_command, $i_timeout_ms = -1, $s_option = @LF)
Local $f_close_session_before_return = 0 ; By default do not close the session at the end
If IsString($h_session) Then
; When we pass a string, i.e. a VISA ID (like GPIB::20::0, for instance) instead
; of a VISA session handler, we will automatically OPEN and CLOSE the instrument
; session for the user.
; This is of course slower if you need to do more than one GPIB call but much
; more convenient for short tests
$f_close_session_before_return = 1
$h_session = _viOpen($h_session)
EndIf
;- Set the VISA timeout if necessary
If $i_timeout_ms >= 0 Then
_viSetTimeout($h_session, $i_timeout_ms)
EndIf
;- Send Command to instrument (using viPrintf VISA function)
; The syntax of the viPrintf VISA function is:
; errStatus = viPrintf (h_session, "%s", "*RST");
; signed int viPrintf (unsigned long, char*, char*);
; For symmetry with the viQueryf function, and to solve compatibility issues
; with some instruments, call viPrintf WITHOUT protecting from escape sequences
; The user MUST thus be careful when passing commands containing the '/' character
Local $a_results
Select
Case $s_option == "str"
; Use the "str" mode to pass the SCPI command to the VISA interface
$a_results = DllCall("visa32.dll", "int","viPrintf", "int",$h_session, "str","%s", "str",$s_command) ; Call viPrintf with escape sequence protection
Case ($s_option == @CR Or $s_option == @LF Or $s_option == @CRLF)
; Append the selected terminator to the SCPI command
$a_results = DllCall("visa32.dll", "int","viPrintf", "int",$h_session, "str", $s_command & $s_option)
Case Else ; In all other cases, ignore the "mode" and do not use any terminator string
$a_results = DllCall("visa32.dll", "int","viPrintf", "int",$h_session, "str", $s_command) ; Call viPrintf without escape sequence protection
EndSelect
If @error <> 0 Then
; Could not open VISA (visa32.dll)
;MsgBox(16,"_viPrintf - DllCall error","Could not open VISA (visa32.dll)")
Return -1
EndIf
Local $errStatus = $a_results[0]
If $errStatus <> 0 Then
; Could not send command to VISA instrument/resource
SetError(1)
;MsgBox(16,"VISA error","Could not send command to VISA instrument/resource: " & $h_session)
Return $errStatus
EndIf
If $f_close_session_before_return == 1 Then
_viClose($h_session)
EndIf
EndFunc
;===============================================================================
;
; Description: Send a QUERY (a Command that returns an answer) to an Instrument/Device
; Syntax: _viQueryf($h_session, $s_query, $i_timeout_ms = -1)
; Parameter(s): $h_session - A VISA descriptor (STRING) OR a VISA session handle (INTEGER)
; Look at the _viExecCommand function for more
; details
; $s_command - The query to execute (e.g. "*IDN?").
; A query MUST contain a QUESTION MARK (?)
; The function willautomatically wait for the
; instrument's answer (or until the operation
; times out)
; $i_timeout_ms - The operation timeout in MILISECONDS
; This is mostly important for QUERIES only
; This is an OPTIONAL PARAMETER.
; If it is not specified the last set timeout will
; be used. If it was never set before the default
; timeout (which depends on the VISA implementation)
; will be used. Timeouts can also be set separatelly
; with the _viSetTimeout function (see below)
; Requirement(s): The VISA libraries must be installed (you can check whether
; visa32.dll is in {WINDOWS}\system32)
; For GPIB communication a GPIB card (such as a National Instruments
; NI PCI-GPIB card or an Agilent 82350B PCI High-Performance GPIB card
; Return Value(s): On Success - Returns a STRING containing the answer of the
; instrument to the QUERY
; On Failure - Returns -1 if the VISA DLL could not be open
; Returns -3 if the VISA DLL returned an unexpected
; number of results
; or returns a NON ZERO value representing the VISA
; error code (see the VISA programmer's guide)
; This function always sets @error to 1 in case of error
; Author(s): Angel Ezquerra <ezquerra at gmail dot com>
; Note(s):
; Normally you do not need to use this function,
; as _viExecCommand automatically choses between _viPrintf and
; _viQueryf depending on the command type.
;
; If you need to use it anyway, make sure that you use it for
; a command that RETURNS an ANSWER or you will be stuck until
; the Timeout expires, which could never happen if the Timeout
; is infinite ("INF")!
;
; Also, this is not really a "SCANF-like" function, as it
; does not allow you to specify the format of the output
;
; There are two known limitations of this function:
; - The GPIB queries only return the 1st line of the device
; answer. This is normally not a problem as most devices
; always return a single line answer.
; - The GPIB queries do not support binary transfer.
;
; See _viExecCommand for more details
;
;===============================================================================
Func _viQueryf($h_session, $s_query, $i_timeout_ms = -1)
Local $f_close_session_before_return = 0 ; By default do not close the session at the end
If IsString($h_session) Then
; When we pass a string, i.e. a VISA ID (like GPIB::20::0, for instance) instead
; of a VISA session handler, we will automatically OPEN and CLOSE the instrument
; session for the user.
; This is of course slower if you need to do more than one GPIB call but much
; more convenient for short tests
$f_close_session_before_return = 1
$h_session = _viOpen($h_session)
EndIf
;- Set the VISA timeout if necessary
If $i_timeout_ms >= 0 Then
_viSetTimeout($h_session, $i_timeout_ms)
EndIf
;- Send QUERY to instrument and get ANSWER
; errStatus = viQueryf (h_session, "*IDN?\n", "%s", s_answer);
; signed int viQueryf (unsigned long, char*, char*, char*);
;errStatus = viQueryf (h_instr, s_command, "%s", string);
Local $a_results, $s_answer = ""
$a_results = DllCall("visa32.dll", "int","viQueryf", "int",$h_session, "str",$s_query, "str","%t", "str", $s_answer)
If @error <> 0 Then
; Could not open VISA (visa32.dll)
;MsgBox(16,"_viQueryf - DllCall error","Could not open VISA (visa32.dll)")
Return -1
EndIf
Local $errStatus = $a_results[0]
If $errStatus <> 0 Then
; Could not query VISA instrument/resource
SetError(1)
;MsgBox(16,"VISA error","Could not query VISA instrument/resource: " & $h_session)
Return $errStatus
EndIf
; Make sure that the DllCall returned enough values
If UBound($a_results) < 5 Then
; Call to viQuery did not return the right number of values
SetError(1)
;MsgBox(16,"VISA error","Call to viQuery did not return the right number of values")
Return -3
EndIf
$s_answer = $a_results[4]
If $f_close_session_before_return == 1 Then
_viClose($h_session)
EndIf
Return $s_answer
EndFunc
;- Misc VISA interface functions -----------------------------------------------
;===============================================================================
;
; Description: Sets the VISA timeout in MILISECONDS (uses _viSetAttribute)
; Syntax: _viSetTimeout($h_session, $i_timeout_ms)
; Parameter(s): $h_session - A VISA descriptor (STRING) OR a VISA session
; handle (INTEGER). Look the explanation in _viExecCommand
; (you can find it above)
; $i_timeout_ms - The timeout IN MILISECONDS for VISA operations
; (mainly for GPIB queries)
; If you set it to 0 the tiemouts are DISABLED
; If you set it to "INF" the VISA operations will NEVER timeout.
; Be careful with this as it could easly hung your program if
; your instrument does not respond to one of your queries
; Depending on the bus type (GPIB, TCP, etc) the timeout might
; not be set to the exact value that you request. Instead the
; closest valid timeout bigger than the one that you requested
; will be used.
; Requirement(s): The VISA libraries must be installed (you can check whether
; visa32.dll is in {WINDOWS}\system32)
; For GPIB communication a GPIB card (such as a National Instruments
; NI PCI-GPIB card or an Agilent 82350B PCI High-Performance GPIB card
; Return Value(s): On Success - Returns 0
; On Failure - Returns -1 if the VISA DLL could not be open
; or a NON ZERO value representing the VISA
; error code (see the VISA programmer's guide)
; This function always sets @error to 1 in case of error
; Author(s): Angel Ezquerra <ezquerra at gmail dot com>
; Note(s): You can avoid directly calling this function most of the time,
; as _viExecCommand accepts a timeout (in ms) as its 3rd argument.
; If you do not pass this 3rd argument then the previous timeout
; will be used (or the default timeout, which depends on the
; VISA driver, if it was never set before)
;
;===============================================================================
Func _viSetTimeout($h_session, $i_timeout_ms)
If StringUpper(String($i_timeout_ms)) == "INF" Then
$i_timeout_ms = $VI_TMO_INFINITE
EndIf
Return _viSetAttribute($h_session, $VI_ATTR_TMO_VALUE, $i_timeout_ms)
EndFunc
;===============================================================================
;
; Description: VISA attribute set (GENERIC)
; Called by _viSetTimeout, this function can ALSO be used to
; set many other VISA specific attributes, like the Serial
; Interface Attributes.
; Read the VISA documentation for more information
; Syntax: _viSetAttribute($h_session, $i_attribute, $i_value)
; Parameter(s): $h_session - A VISA descriptor (STRING) OR a VISA session
; handle (INTEGER). Look the explanation in _viExecCommand
; (you can find it above)
; $i_attribute - The index of the attribute that must be changed
; Attributes are defined in the VISA library. This AutoIt
; implementation only defines a CONSTANT for the TIMEOUT
; attribute ($VI_ATTR_TMO_VALUE) but you can pass any other
; index if you want to.
; $i_value - The value of the attribute. It must be an integer
; and the possible values depend on the attribute type
; Requirement(s): The VISA libraries must be installed (you can check whether
; visa32.dll is in {WINDOWS}\system32)
; For GPIB communication a GPIB card (such as a National Instruments
; NI PCI-GPIB card or an Agilent 82350B PCI High-Performance GPIB card
; Return Value(s): On Success - Returns 0
; On Failure - Returns -1 if the VISA DLL could not be open
; or a NON ZERO value representing the VISA
; error code (see the VISA programmer's guide)
; This function always sets @error to 1 in case of error
; Author(s): Angel Ezquerra <ezquerra at gmail dot com>
; Note(s):
; This is a list of the currently pre-defined attributes and
; values. Remember that you can use any other valid
; attribute/value by passing the corresponding integer index
; (as defined in the VISA programmer's guide) to this function.
;
; * Attribute: $VI_ATTR_TMO_VALUE -> Set Timeout
; * Values:
; A timeout in MILLISECONDS or
; $VI_TMO_IMMEDIATE (or 0) for "Return immediatly"
; VI_TMO_INFINITE (or "INF") for "No timeout"
;
; * Attribute: $VI_ATTR_TERMCHAR -> Set Termination Character
; * Values:
; The ASCII code number of the terminator character
; which is used for VISA messages.
; - Typical values are:
; 0x0A: Linefeed or newline ("\n")
; 0x0C: Form feed ("\f")
; 0x0D: Carriage return ("\r")
;
; * Attribute: $VI_ATTR_TERMCHAR_EN -> Set Termination Character
; * Values:
; For many instruments this attribute has no effect.
; For those who take it into account:
; $VI_FALSE: Wait for the TIMEOUT before returning from
; a viRead operation
; $VI_TRUE: Allow read operations to terminate as soon
; as the "VI_ATTR_TERMCHAR" character is received
; during a viRead.
; which is used for VISA messages (e.g. 10)
; $VI_TMO_IMMEDIATE (or 0) for "Return immediatly"
; VI_TMO_INFINITE (or "INF") for "No timeout"
; * Default Value: $VI_FALSE. Note that many instruments ignore this.
;
; * Attribute: $VI_ATTR_ASRL_BAUD
; * Values:
; Any valid baudrate (9600, 115200, etc)
;
; * Attribute: $VI_ATTR_ASRL_DATA_BITS
; * Values:
; From 5 to 8
;
; * Attribute: $VI_ATTR_ASRL_PARITY
; * Values:
; $VI_ASRL_PAR_NONE
; $VI_ASRL_PAR_ODD
; $VI_ASRL_PAR_EVEN
; $VI_ASRL_PAR_MARK
; $VI_ASRL_PAR_SPACE
;
; * Attribute: $VI_ATTR_ASRL_STOP_BITS
; * Values:
; $VI_ASRL_STOP_ONE
; $VI_ASRL_STOP_ONE5
; $VI_ASRL_STOP_TWO
;
; * Attribute: $VI_ATTR_ASRL_FLOW_CNTRL
; * Values:
; $VI_ASRL_FLOW_NONE
; $VI_ASRL_FLOW_XON_XOFF
; $VI_ASRL_FLOW_RTS_CTS
; $VI_ASRL_FLOW_DTR_DSR
;
;===============================================================================
Func _viSetAttribute($h_session, $i_attribute, $i_value)
Local $f_close_session_before_return = 0 ; By default do not close the session at the end
If IsString($h_session) Then
; When we pass a string, i.e. a VISA ID (like GPIB::20::0, for instance) instead
; of a VISA session handler, we will automatically OPEN and CLOSE the instrument
; session for the user.
; This is of course slower if you need to do more than one GPIB call but much
; more convenient for short tests
$f_close_session_before_return = 1
$h_session = _viOpen($h_session)
EndIf
; errStatus = _viSetAttribute ($h_session, $VI_ATTR_TMO_VALUE, $timeout_value);
; signed int viGpibControlREN (unsigned long, int, int);
Local $a_results
$a_results = DllCall("visa32.dll", "int","viSetAttribute", "int",$h_session, "int", $i_attribute, "int",$i_value)
If @error <> 0 Then
; Could not open VISA (visa32.dll)
;MsgBox(16,"_viSetAttribute - DllCall error","Could not open VISA (visa32.dll)")
Return -1
EndIf
Local $errStatus = $a_results[0]
If $errStatus <> 0 Then
; Could not set attribute of VISA instrument/resource
SetError(1)
;MsgBox(16,"VISA error","Could not set attribute of VISA instrument/resource: " & $h_session)
Return $errStatus
EndIf
If $f_close_session_before_return == 1 Then
_viClose($h_session)
EndIf
Return 0
EndFunc
;===============================================================================
;
; Description: Go To Local mode (uses _viGpibControlREN)
; Instruments that accept this command will exit the "Remote
; Control mode" and go to "Local mode"
; If the instrument is already in "Local mode" this is simply
; ignored.
; Normally, if an instrument does not support this command it
; will simply stay in the "Remote Control mode"
; Syntax: _viGTL($h_session)
; Parameter(s): $h_session - A VISA descriptor (STRING) OR a VISA session
; handle (INTEGER). Look the explanation in _viExecCommand
; (you can find it above)
; Requirement(s): The VISA libraries must be installed (you can check whether
; visa32.dll is in {WINDOWS}\system32)
; For GPIB communication a GPIB card (such as a National Instruments
; NI PCI-GPIB card or an Agilent 82350B PCI High-Performance GPIB card
; This function always sets @error to 1 in case of error
; Return Value(s): On Success - Returns 0
; On Failure - Returns -1 if the VISA DLL could not be open
; or a NON ZERO value representing the VISA
; error code (see the VISA programmer's guide)
; This function always sets @error to 1 in case of error
; Author(s): Angel Ezquerra <ezquerra at gmail dot com>
; Note(s): None
;
;===============================================================================
Func _viGTL($h_session)
Return _viGpibControlREN($h_session, $VI_GPIB_REN_ADDRESS_GTL)
EndFunc
;===============================================================================
;
; Description: GPIB BUS "reset" (uses _viGpibControlREN)
; Use this function when the GPIB BUS gets stuck for some reason.
; You might be lucky and resolve the problem by calling this
; function
; Syntax: _viGpibBusReset()
; Parameter(s): None
; Requirement(s): The VISA libraries must be installed (you can check whether
; visa32.dll is in {WINDOWS}\system32)
; For GPIB communication a GPIB card (such as a National Instruments
; NI PCI-GPIB card or an Agilent 82350B PCI High-Performance GPIB card
; Return Value(s): On Success - Returns 0
; On Failure - Returns -1 if the VISA DLL could not be open
; or a NON ZERO value representing the VISA
; error code (see the VISA programmer's guide)
; This function always sets @error to 1 in case of error
; Author(s): Angel Ezquerra <ezquerra at gmail dot com>
; Note(s): None
;
;===============================================================================
Func _viGpibBusReset()
Return _viGpibControlREN("GPIB0::INTFC", $VI_GPIB_REN_DEASSERT)
EndFunc
;===============================================================================
;
; Description: Control the VISA REN bus line
; Syntax: _viGpibControlREN ($h_session, $i_mode)
; Parameter(s): $h_session - A VISA descriptor (STRING) OR a VISA session
; handle (INTEGER). Look the explanation in _viExecCommand
; (you can find it above)
; $i_mode - The mode into which the REN line of the GPIB bus
; will be set.
; Modes are defined in the VISA library. Look at the top of
; this file for valid modes
; Requirement(s): The VISA libraries must be installed (you can check whether
; visa32.dll is in {WINDOWS}\system32)
; For GPIB communication a GPIB card (such as a National Instruments
; NI PCI-GPIB card or an Agilent 82350B PCI High-Performance GPIB card
; Return Value(s): On Success - Returns 0
; On Failure - Returns -1 if the VISA DLL could not be open
; or a NON ZERO value representing the VISA
; error code (see the VISA programmer's guide)
; This function always sets @error to 1 in case of error
; Author(s): Angel Ezquerra <ezquerra at gmail dot com>
; Note(s): This function is used by _viGTL and _viGpibBusReset
;
;===============================================================================
Func _viGpibControlREN ($h_session, $i_mode)
Local $f_close_session_before_return = 0 ; By default do not close the session at the end
If IsString($h_session) Then
; When we pass a string, i.e. a VISA ID (like GPIB::20::0, for instance) instead
; of a VISA session handler, we will automatically OPEN and CLOSE the instrument
; session for the user.
; This is of course slower if you need to do more than one GPIB call but much
; more convenient for short tests
$f_close_session_before_return = 1
$h_session = _viOpen($h_session)
EndIf
; errStatus = viGpibControlREN ($h_session, VI_GPIB_REN_ASSERT);
; signed int viGpibControlREN (unsigned long, int);
Local $a_results
$a_results = DllCall("visa32.dll", "int","viGpibControlREN", "int",$h_session, "int", $i_mode)
If @error <> 0 Then
; Could not open VISA (visa32.dll)
;MsgBox(16,"_viGpibControlREN - DllCall error","Could not open VISA (visa32.dll)")
Return -1
EndIf
Local $errStatus = $a_results[0]
If $errStatus <> 0 Then
; Could not send to Local VISA instrument/resource
SetError(1)
;MsgBox(16,"VISA error","Could not send to Local VISA instrument/resource: " & $h_session)
Return $errStatus
EndIf
If $f_close_session_before_return == 1 Then
_viClose($h_session)
EndIf
Return 0
EndFunc
;===============================================================================
;
; Description: Interactive VISA control.
; This function lets you easily test your SCPI commands
; interactively.
; It also lets you save these commands into a file
; Simply answer the questions (Device Descriptor, SCPI command
; and timeout).
; * If you click Cancel on the 1st question the interactive
; control ends.
; * If you click Cancel to the other queries, you will go back
; to the Device Descriptor question.
; Syntax: _viInteractiveControl($s_command_save_filename = "")
; Parameter(s): $s_command_save_filename - This is an OPTIONAL PARAMETER
; The name of the file in which the SCPI commands issued
; during the interactive session will be saved.
; If no filename is passed the funcion asks the user if and
; where does the user want to save the issued commands.
; Requirement(s): The VISA libraries must be installed (you can check whether
; visa32.dll is in {WINDOWS}\system32)
; For GPIB communication a GPIB card (such as a National Instruments
; NI PCI-GPIB card or an Agilent 82350B PCI High-Performance GPIB card
; Return Value(s): The list of AutoIt3 VISA commands that were executed by the tool.
; This is the same list that is saved into the file if the a
; filename is passed to the function.
; Author(s): Angel Ezquerra <ezquerra at gmail dot com>
; Note(s): Type "FIND" in the Device Descriptor query to perform a GPIB
; search
;
;===============================================================================
Func _viInteractiveControl($s_command_save_filename = "")
;- Define variables, set their default values
Local $s_vi_id = "FIND" ; "GPIB::1::0" ; Default values
Local $s_command = "*IDN?"
Local $i_timeout_ms = 10000 ; ms
Local $s_answer = ""
Local $a_descriptor_list[1], $a_idn_list[1] ; The results of the GPIB search
; The variables used to save the commands to a file
Local $s_empty_command_list = "#include <Visa.au3>" & @CR & @CR & "Local $s_answer" & @CR & @CR
Local $s_new_command = ""
Local $s_command_list = $s_empty_command_list
;- Loop until the user Cancles the Instrument Device Descriptor request
While 1
;- Request the Instrument Descriptor (reuse the previous descriptor)
$s_vi_id = InputBox("Instrument Device Descriptor", _
"- Type the Instrument Device Descriptor (e.g. 'GPIB::1::0' or 'GPIB::1::INSTR')" & _
@CR & @CR & _
"- Type FIND to perform a GPIB search" & _
@CR & @CR & _
"- Click CANCEL to STOP the VISA interactive tool", $s_vi_id, "", 500, 250)
If @error == 1 Then
; The Cancel button was pushed -> Exit the loop
ExitLoop
EndIf
If StringUpper($s_vi_id) == "FIND" Then
; Perform a GPIB search
$s_command_list = $s_command_list & _
"Local $a_descriptor_list[1], $a_idn_list[1]" & @CR & @CR & _
"_viFindGpib($a_descriptor_list, $a_idn_list, 1)" & @CR & @CR
_viFindGpib($a_descriptor_list, $a_idn_list, 1)
If UBound($a_descriptor_list) >= 1 Then
; If an instrument was found, use the 1st found instrument as the default
; for the next query
$s_vi_id = $a_descriptor_list[0]
EndIf
ContinueLoop
EndIf
;- Request the command that must be executed (reuse the previous command)
$s_answer = InputBox("SCPI command","Type the SCPI command", $s_command)
If @error == 1 Then
; The Cancel button was pushed -> Restart the process
ContinueLoop
EndIf
$s_command = $s_answer ; We got a valid command
;- Request the timeout (reuse the previous timout)
$s_answer = InputBox("Command Timeout (ms)", _
"Type the command timeout (in milliseconds)", $i_timeout_ms)
If @error == 1 Then
; The Cancel button was pushed -> Restart the process
ContinueLoop
EndIf
$i_timeout_ms = 0 + $s_answer ; We got a valid timeout
;- Add the command to the command list
$s_new_command = '$s_answer = _viExecCommand("' & $s_vi_id & '", "' & _
$s_command & '", ' & $i_timeout_ms & ')'
$s_command_list = $s_command_list & $s_new_command & @CR
;- Execute the requested command
$s_answer = _viExecCommand($s_vi_id, $s_command, $i_timeout_ms)
If IsString($s_answer) Then
;- The command was a query and the instrument answered it
; Show the query results
MsgBox(64,"Query results", "[" & $s_vi_id & "] " & $s_command & " -> " & $s_answer)
ElseIf $s_answer == 0 Then
;- The command was not a query but it was exuced successfully
MsgBox(64, "Command result", "The command:" & @CR & @CR & _
" '" & $s_command & "'" & @CR & @CR & _
"was SUCCESSFULLY executed on the device: " & @CR & @CR & _
" '" & $s_vi_id & "'")
ElseIf $s_answer < 0 Then
;- There was an error -> Show an error message
$s_answer = MsgBox(16 + 4,"VISA Error", _
"There was a VISA error when executing the command:" & @CR & @CR & _
"'" & $s_command & "'" & @CR & @CR & "on the Device '" & $s_vi_id & "'" & _
@CR & @CR & _
"Do you want to RESET the GPIB bus before continuing?")
If $s_answer == 6 Then ; Yes
_viGpibBusReset()
MsgBox(0,"VISA","The GPIB bus was RESET!")
EndIf
EndIf
WEnd
If $s_command_list <> $s_empty_command_list Then
; If at least one command was issued we might want to save the file
If $s_command_save_filename == "" Then
; The user did not pass an explicit file name in which to save the commands
; Ask him if he wants to save the m now
$s_answer = MsgBox(64 + 4, "Save commands to AutoIt3 script?", _
"Do you want to save the commands that you issued into an AutoIt3 script?")
If $s_answer == 6 Then ; Yes
$s_command_save_filename = FileSaveDialog("Save as...", @ScriptDir, _
"AutoIt3 scripts (*.au3)", 16, "visa_log.au3")
If @error <> 0 Then
$s_command_save_filename = ""
EndIf
EndIf
EndIf
If $s_command_save_filename <> "" Then
;- Save the SCPI commands into a file
If FileExists($s_command_save_filename) Then
; Delete the save file if it already exists
FileDelete($s_command_save_filename)
EndIf
FileWrite($s_command_save_filename, $s_command_list)
EndIf
EndIf
Return $s_command_list ; Return the list of executed commands
EndFunc