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Appendix B Error Codes and Solutions
© National Instruments Corp. B-3 NI-488.2 User Manual for Windows
Solutions
• Use ibsic or SendIFC to make the GPIB board become CIC on the GPIB.
• Use ibrsc 1 to make sure your GPIB board is configured as System Controller.
• In multiple CIC situations, always be certain that the CIC bit appears in the status
word ibsta before attempting these calls. If it does not appear, you can perform an
ibwait (for CIC) call to delay further processing until control is passed to the board.
ENOL (2)
ENOL usually occurs when a write operation is attempted with no Listeners addressed.
For a device write, this error indicates that the GPIB address configured for that device in
the software does not match the GPIB address of any device connected to the bus, that
the GPIB cable is not connected to the device, or that the device is not powered on.
ENOL can also occur in situations in which the GPIB board is not the CIC and the
Controller asserts ATN before the write call in progress has ended.
Solutions
• Make sure that the GPIB address of your device matches the GPIB address of the
device to which you want to write data.
• Use the appropriate hex code in ibcmd to address your device.
• Check your cable connections and make sure at least two-thirds of your devices are
powered on.
• Call ibpad (or ibsad , if necessary) to match the configured address to the device
switch settings.
• Reduce the write byte count to that which is expected by the Controller.
EADR (3)
EADR occurs when the GPIB board is CIC and is not properly addressing itself before
read and write functions. This error is usually associated with board-level functions.
EADR is also returned by the function ibgts when the shadow-handshake feature is
requested and the GPIB ATN line is already unasserted. In this case, the shadow
handshake is not possible and the error is returned to notify you of that fact.