SECTION 4
IEEE-488 Reference
Table 4-6.
IEEE-488 Error Messages
NO DEFLTS
LJNCAL
lDDc
lDDC0
NO REMOTE
ROM ERROR
RAh4 ERROR
TRG OVERUN
CONFLICT
CALVALUE
CAL LOCK
ZAL ERROR
CALZCHK
Description
Checksum error in default con&
tions during power-up.
checksum error in calibration con-
stants during power-up.
Invalid device-dependent com-
mand.
Invalid device-dependent com-
mand option
,X received while not in remote.
Failed ROM self-test.
Failed RAM self-test.
Trigger overrun; instrument tig-
@red while still processing a pre-
vious trigger.
Voltage source level of the Model
487 conflicts with currently se-
lected voltage source range, or
relative value conflicts with cur-
rently selected measurement
rsnge.
Calibration value confiicts with the
currently selected range.
Sent calibration command with
calibration switch (CAL LOCK)
disabled.
Calibration value not within allow-
able limits.
Cannot calibrate pica-eter with
zero check enabled.
Programming Example-To demonstrate an IDDC er-
*or, use the following statements:
REMOTE 722
OUTPUT 722;‘W
The IDDC error message is briefly displayed when the
second statement above is executed.
IDDCO (Illegal Device-Dependent Command Option)
Error
Sending the instrument a legal command with an illegal
option results in the IDDCO error message being dis-
played.
For example, the command P5X has an illegal option (5)
that is not part of the instruments programming lan-
guage. Thus, although the command P is valid, the op-
tion is not, and the IDDCO error results.
NOTE
When an IDDCO error is detected in a com-
mand string, alI comman ds in the string, up to
and in&ding the next X, are ignored.
Programming Example-Demonstrate an IDDCO error
with the following statements:
REMOTE 722
OUTPUT 722;‘T5X”
Note that the IDDCO error message is briefly displayed
when the second statement above is executed.
No Remote Error
A not in remote error occurs if the instrument receives
and ‘X” while it is in the local state. The NO REMOTE er-
ror message is displayed. This is caused by failing to set
the REN line true before addressing the Model 486/487
to listen. (The HP9000 default is to set REN true.) The
statement “REMOTE 7” sets the REN line true; the state
ment “REMOTE 722” sets the RRN line true and ad-
dresses unit 22 to listen.
Programming Example -To demonstrate the NO RE-
MOTE error message, type in the following lines:
LOCAL 7
OUTMIT 722;‘TOx”
Note that the NO REMOTE error message is briefly dis-
played when the program times out.
Trigger Overrun Enmr
A trigger ovemm occurs when the instrument is trig-
geredwbileitisstillprocessingaprevioustriggerandbe-
fore the READY bit in the SPOLL byte is asserted. The ex-
act trigger stimulus depends on the selected trigger
mode, as discussed in paragraph 4.2.18.
449
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