National Instruments NI-488.2 - Manual (Page 110)

Appendix C Error Codes and Solutions
NI-488.2 User Manual C-6 ni.com
ENEB (7)
ENEB occurs when a GPIB interface is configured for use by the system,
but the driver cannot find the interface. This problem happens when the
interface is not physically plugged into the system, the I/O address
specified during configuration does not match the actual interface setting,
or there is a system conflict with the base I/O address.
Solutions
Make sure there is a GPIB interface in your computer that is properly
configured both in hardware and software using a valid base I/O address
by running the NI-488.2 Troubleshooting Utility, as follows:
Windows
1. Select Start»Programs»National Instruments»
Measurement & Automation.
2. Select Help»Troubleshooting»NI-488.2 Troubleshooting Utility.
Mac OS X
Run Applications»National Instruments»NI-488.2»Troubleshoot.
Linux
Enter the following command:
<InstallDir>/natinst/ni4882/bin/gpibtsw
where <InstallDir> is the directory where you chose to install the
NI-488.2 software. The default is /usr/local .
EOIP (10)
EOIP occurs when an asynchronous I/O operation has not finished before
some other call is made. During asynchronous I/O, you can only use
ibstop , ibnotify , ibwait , and ibonl or perform other non-GPIB
operations. If any other call is attempted, EOIP is returned.