National Instruments NI-488.2 User Manual
Page 50
Chapter 4
Developing Your NI-488.2 Application
© National Instruments Corporation
4-13
is 0x01; otherwise, if the primary address is 1 and the secondary address is
0x67, then the 16-bit value is 0x6701.
Step 3. Initialize the Devices
Use
DevClearList
to clear the devices on the GPIB. The first argument
is the GPIB interface number. The second argument is the list of GPIB
addresses that were found to be listening as determined in Step 2.
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.