Ecic (1), Enol (2), Solutions – National Instruments NI-488.2 User Manual

Page 107

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Appendix C

Error Codes and Solutions

© National Instruments Corporation

C-3

NI-488.2 User Manual

Use the unit descriptor returned from

ibdev

or

ibfind

as the first

parameter in subsequent traditional NI-488.2 calls. Examine the
variable before the failing function to make sure its value has not been
corrupted.

ECIC (1)

ECIC is returned when one of the following functions is called while the
interface is not CIC:

Any device-level traditional NI-488.2 calls that affect the GPIB.

Any board-level traditional NI-488.2 calls that issue GPIB command
bytes:

ibcmd

,

ibcmda

,

ibln

, and

ibrpp

.

ibcac

and

ibgts

.

Any NI-488.2 multi-device calls that issue GPIB command bytes:

SendCmds

,

PPoll

,

Send

, and

Receive

.

Solutions

Possible solutions for this error are as follows:

Use

ibsic

or

SendIFC

to make the GPIB interface become CIC

on the GPIB.

Use the

IbcSC

option in

ibconfig

to make sure your GPIB interface

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 interface.

ENOL (2)

ENOL usually occurs when a write operation is attempted with no
Listeners addressed. For a device write, ENOL 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 occur in situations where the GPIB interface is not the CIC and
the Controller asserts ATN before the write call in progress has ended.

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