Appendix C Error Codes and Solutions
NI-488.2 User Manual for Windows C-8 www.natinst.com
EBUS (14)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.
Solutions
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 (15)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.
Solutions
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.