Status and Message Information
Appendix B
GPIB-SCSI-A User Manual
B-8
© National Instruments Corp.
valid for G mode only, G is indicated. If the error is valid for S mode and G
mode, S/G is indicated. Only one GPIB error can exist at any time.
The following paragraphs describe the GPIB errors in detail.
NGER
S/G
0
The GPIB-SCSI-A reports this value when no GPIB
errors were detected as a result of the last operation.
ECIC
S
1
The GPIB-SCSI-A records this error when you call a
function that requires that the GPIB-SCSI-A be
Controller-In-Charge (CIC) and it is not CIC.
In cases when the GPIB-SCSI-A should always be the
CIC, call
sic
to send Interface Clear. In multiple CIC
situations, you can call
wait
(CIC) to delay further
processing until control is passed to the GPIB-SCSI-A.
ENOL
S/G
2
The ENOL error occurs most frequently when the
GPIB-SCSI-A attempts to write to the GPIB and there are
no Listeners addressed.
In S mode, the remedy is to be sure that the proper listen
address is in the Command Descriptor Block, to use
cmd
to properly address the Listeners, or to be sure some other
Controller has addressed the Listeners before writing data.
This error occurs less frequently in situations where the
GPIB-SCSI-A is not the CIC and the Controller asserts
ATN before the G mode
read
,
rdext
, or
dtin
call in
progress or the S mode
wrt
or
bwrt
call in progress
terminates. Either reduce the write byte count to that
which is expected by the Controller or resolve the
situation on the Controller's end.
