National Instruments NI-488.2 Benutzerhandbuch

© National Instruments Corporation

This appendix describes how to troubleshoot problems and answers some 
common questions about the NI-488.2 software for Windows 98/95.

In some cases, NI-488.2 calls may return with the ERR bit set in 

ibsta

 and 

the value EDVR in 

iberr

. The value stored in 

ibcntl

 is useful in 

troubleshooting the error condition.

If a call is made with an interface number that is within the range of allowed 
interface numbers (typically 0 to 3), but which has not been assigned to a 
GPIB interface, an EDVR error condition occurs with 

ibcntl

 set to 

0xE028002C. You can assign an interface number to a GPIB interface by 
configuring the NI-488.2 software and selecting an interface name. For 
information about how to configure the NI-488.2 software, refer to the 
online help in 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.

If a call is made with an interface number that is not within the range of 
allowed interface numbers (typically 0 to 3), an EDVR error condition 
occurs with 

ibcntl

 set to 0xE0140025.