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Programming via GPIB and VXI 4
Agilent VISA User’s Guide 115
Using Low/High-Level Memory I/O Methods
VISA supports three different memory I/O methods for
accessing memory on the VXI backplane, as shown. All three
of these access methods can be used to read and write VXI
memory in the A16, A24, and A32 address spaces. The best
method to use depends on the VISA program characteristics.
• Low- level viPeek/viPoke
• viMapAddress
• viUnmapAddress
• viPeek8, viPeek16, viPeek32
• viPoke8, viPoke16, viPoke32
• High- level viIn/viOut
• viIn8, viIn16, viIn32
• viOut8, viOut16, viOut32
• High- level viMoveIn/viMoveOut
• viMoveIn8, viMoveIn16, viMoveIn32
• viMoveOut8, viMoveOut16, viMoveOut32
Using Low-Level viPeek/viPoke
Low- level viPeek/viPoke is the most efficient in programs
that require repeated access to different addresses in the
same memory space.
The advantages of low- level viPeek/viPoke are:
• Individual viPeek/viPoke calls are faster than viIn/viOut
or viMoveIn/viMoveOut calls.
• Memory pointers may be directly de- referenced in some
cases for the lowest possible overhead.
The disadvantages of low- level viPeek/viPoke are:
• A viMapAddress call is required to set up mapping before
viPeek/viPoke can be used.
- Agilent VISA User’s Guide 1
- 4 Agilent VISA User’s Guide 4
- Agilent VISA User’s Guide 5 5
- 6 Agilent VISA User’s Guide 6
- Introduction 7
- What’s in This Guide? 8
- VISA Overview 9
- VISA Support 10
- VISA Documentation 10
- Introduction 1 11
- Agilent VISA User’s Guide 11 11
- Contacting Agilent 12
- Agilent Technologies 13
- Linking to VISA Libraries 14
- Sample VISA Program (C/C++) 15
- C/C++ Sample Program Contents 17
- Format Conversion Commands 20
- Numeric Arrays 20
- Steps to Running the Program 21
- Sample Program Source Code 22
- Sample Program Contents 24
- Agilent VISA User’s Guide 25 25
- Logging Error Messages 26
- 28 Agilent VISA User’s Guide 28
- Programming with VISA 29
- VISA Resources and Attributes 30
- VISA Attributes 31
- 3 Programming with VISA 32
- Using Sessions 33
- Opening a Session 34
- Addressing a Session 36
- Sample: Opening a Session 39
- Closing a Session 40
- Searching for Resources 40
- Sending I/O Commands 43
- Formatted I/O Conversion 45
- Using Non-Formatted I/O 54
- Using Events and Handlers 57
- Programming with VISA 3 59
- Agilent VISA User’s Guide 59 59
- Agilent VISA User’s Guide 61 61
- Agilent VISA User’s Guide 63 63
- Using the Callback Method 65
- Sample: Trigger Callback 69
- Sample: SRQ Callback 71
- Using the Queuing Method 74
- Enabling Events 75
- Sample: Wait on Event for SRQ 77
- Sample: Trigger Event Queuing 77
- Trapping Errors 80
- Sample: Printing Error Code 81
- Exception Events 82
- Using Locks 87
- VISA Lock Types 88
- Sample: Exclusive Lock 89
- Programming via GPIB and VXI 93
- General Interface Information 94
- GPIB Interfaces Overview 95
- 82350 GPIB Card #1 96
- Windows PC 96
- GPIB InstrumentsGPIB Cable 96
- 82350 GPIB Card #2 96
- VXI Interfaces Overview 98
- GPIB-VXI Interfaces Overview 99
- GPIB-VXI (E1406A) Interfaces 100
- Programming the Registers 102
- Using viIn and viOut 103
- Using viMoveIn and viMoveOut 104
- Functions 106
- Mapping Memory Space 109
- Sample: Using viPeek16 110
- Unmapping Memory Space 111
- Using Low-Level viPeek/viPoke 115
- Using High-Level viIn/viOut 116
- Sample: Using VXI Memory I/O 117
- Memory I/O Services 121
- MEMACC Attribute Descriptions 124
- Agilent VISA User’s Guide 125 125
- VI_ATTR_WIN_ACCESS Settings 128
- Setting the VXI Trigger Line 129
- Programming via LAN 131
- 5 Programming via LAN 132
- Client/Server Model 133
- Gateway Operation 133
- Programming via USB 141
- USB Interfaces Overview 142
- Value Description Data Type 143
- 6 Programming via USB 144
- ViFind32 156
- VISA address 156
- VISA alias 156
- 158 Agilent VISA User’s Guide 158
- Agilent VISA User’s Guide 159 159
- 160 Agilent VISA User’s Guide 160
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