IEEE-488 GPIB Interface
22
Figure
10
Error Status Word Format
Figure
11
Revision History Word Format
Note:
If Writable stores parameter has not been set, this command responds only with -4420-.
Error Status Word (U1) —
The format of the error status word and the possible
error messages are shown in
Figure
10
. When an error occurs, an error is also flagged
in the status (serial poll) byte, and a SRQ may be generated (
"SRQ Mask
(Mxx)"
on page 21
). All flags will revert to their non-error states after the U1 command is
sent.
Status
Meaning
Description
ICM
Invalid Command
Set when an illegal device-dependent command
(IDDC) such as V2 is received. (V is illegal)
VCM
Valid Command
Set when no IDDC is received.
ICO
Invalid Command Option
Set when an illegal device-dependent command
option (IDDCO) such as T6 is received. (6 is illegal)
VCO
Valid Command Option
Set when no IDDCO is received.
PS
Self-Test Pass
Set when a self-test has been initiated by the
J0 command and the test result is acceptable.
FL
Self-Test Fail
Set when the self-test has failed. (This is the
default condition.)
Revision History Word (U2) —
The format of the revision history word is shown in
Figure
11
.
