National Instruments NI-488.2 Benutzerhandbuch

EBUS results when certain GPIB bus errors occur during device functions. 
All device functions send command bytes to perform addressing and other 
bus management. Devices are expected to accept these command bytes 
within the time limit specified by the default configuration or the 

ibtmo

 

function. EBUS results if a timeout occurred while sending these command 
bytes. 

Possible solutions for this error are as follows:

•

Verify that the instrument is operating correctly.

•

Check for loose or faulty cabling or several powered-off instruments 
on the GPIB.

•

If the timeout period is too short for the driver to send command bytes, 
increase the timeout period.

ESTB is reported only by the 

ibrsp

 function. ESTB indicates that one or 

more serial poll status bytes received from automatic serial polls have been 
discarded because of a lack of storage space. Several older status bytes are 
available; however, the oldest is being returned by the 

ibrsp

 call.

Possible solutions for this error are as follows:

•

Call 

ibrsp

 more frequently to empty the queue.

•

Disable autopolling with the 

ibconfig

 function (option 

IbcAUTOPOLL

) or the NI-488.2 Configuration utility, as follows:

1.

Select Start»Programs»National Instruments 
NI-488.2»Explore GPIB to start Measurement & Automation 
Explorer.

2.

Expand the Devices and Interfaces directory by clicking on the + 
next to the folder.

3.

Right-click on your GPIB interface and select Properties from 
the drop-down menu that appears.