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NI-488.2 User Manual for Windows vi www.natinst.com
Access Additional Help and Resources.........................................................................2-14
NI-488.2 Online Help .....................................................................................2-14
National Instruments GPIB Web Site.............................................................2-15
View or Change GPIB-ENET Network Settings (Windows 98/95 Only) ....................2-15
Assign IP Address...........................................................................................2-15
Configure Advanced IP Settings.....................................................................2-15
Update GPIB-ENET Firmware.......................................................................2-16
Chapter 3
Developing Your NI-488.2 Application
Simple Instrument Control............................................................................................3-1
Interactive Instrument Control ......................................................................................3-2
Choosing Your Programming Methodology................................................................. 3-3
Choosing a Method to Access the NI-488.2 Driver........................................3-3
NI-488.2 Language Interfaces.......................................................... 3-3
Direct Entry Access..........................................................................3-3
Choosing How to Use the NI-488.2 API ........................................................ 3-4
Communicating with a Single GPIB Device....................................3-4
Using Multiple Interfaces and/or Multiple Devices .........................3-5
Checking Status with Global Variables.........................................................................3-5
Status Word (ibsta)..........................................................................................3-5
Error Variable (iberr) ......................................................................................3-7
Count Variables (ibcnt and ibcntl).................................................................. 3-7
Using Interactive Control to Communicate with Devices.............................................3-7
Programming Models....................................................................................................3-8
Applications That Communicate with a Single GPIB Device........................3-8
Items to Include ................................................................................3-8
General Program Steps and Examples..............................................3-8
Applications That Use Multiple Interfaces or Communicate with
Multiple GPIB Devices................................................................................3-10
Items to Include ................................................................................3-10
General Program Steps and Examples..............................................3-10
Language-Specific Programming Instructions..............................................................3-12
Microsoft Visual C/C++ (Version 2.0 or Later) .............................................3-12
Borland C/C++ (Version 4.0 or Later)............................................................3-12
Visual Basic (Version 4.0 or Later)................................................................3-13
Direct Entry with C.........................................................................................3-13
gpib-32.dll Exports...........................................................................3-13
Directly Accessing the gpib-32.dll Exports...................................... 3-14
Running Existing NI-488.2 Applications......................................................................3-17
Running Existing Win32 and Win16 NI-488.2 Applications......................... 3-17
Running Existing DOS NI-488.2 Applications Under Windows 98/95......... 3-17
Running Existing DOS NI-488.2 Applications under Windows 2000/NT..... 3-18