National Instruments NI-488.2 - Manual (Page 48)

Chapter 4 Developing Your NI-488.2 Application
© National Instruments Corporation 4-11 NI-488.2 User Manual
Device Communication
Step 4. Communicate with the Devices
Communicate with the devices by sending them the "*IDN?" query and
then reading back the responses. Many devices respond to this query by
returning a description of the device. Refer to the documentation that came
with your GPIB devices to see specific instruction on the proper way to
communicate with them.
Step 4a.
Use SendList to send the "*IDN?" query command to multiple GPIB
devices. The address is the list of GPIB devices to be queried. The buffer
that you pass to
SendList is the command message to the device.
Step 4b.
Use Receive for each device to read the responses from each device.
Continue communicating with the GPIB devices until you are finished.
Cleanup
Step 5. Place the Interface Offline before Exiting Your Application
Use ibonl to put the interface offline before you exit the application.
Language-Specific Programming Instructions for
Windows
The following sections describe how to develop, compile, and link your
Windows NI-488.2 applications using various programming languages.
Microsoft Visual C/C++ (Version 2.0 or Later)
Before you compile your Win32 C application, make sure that
the following lines are included at the beginning of your program:
#include
#include "ni488.h"
To compile and link a Win32 console application named cprog
in a DOS shell, type the following on the command line:
cl cprog.c gpib-32.obj