E? - Query Error Status
SYNTAX
E?
Returns error status code which indicates the last error encountered. It returns:
•
E0
if No Error has occurred.
•
E1
if Unrecognized Command.
•
E2
if Invalid Command Parameter.
•
E3
if Command Conflict Error.
•
E5
if Non-Volatile RAM Checksum Failure.
•
E6
if Internal Data Buffer Overrun.
Note:
Except for
E5
, error is cleared upon reading error status.
DESCRIPTION
The Query Error Status (
E?
) command is used to determine the present error condition on the selected channel of the
Digital488/80A. After execution of the
E?
command, the present error condition is cleared. The error condition is also
cleared by executing the User Status (
U
) command
U0
. When an error has occurred, the front-panel ERROR LED
indicator turns on. The ERROR LED stays on until an
E?
or
U0
command is executed.
If a Non-Volatile RAM Checksum Failure (
E5
) occurs, then it can only be cleared by doing a save of the configuration
using the Save Configuration (
S
) command. Executing this command updates the checksum to a known value and
clears the
E5
error condition.
EXAMPLE 1: No Error.
PRINT#1,"CLEAR08"
Line 1:
Reset the Digital488/80A.
PRINT#1,"OUTPUT08;E?"
Line 2:
Query the error status.
PRINT#1,"ENTER08",
INPUT#2,A$,
PRINT A$
Line 5:
Display shows:
E0
(no errors have occurred).
EXAMPLE 2: Unrecognized Command.
PRINT#1,"OUTPUT08;W5X"
Line 1:
Send an illegal command to the Digital488/80A (no
W
command exists).
PRINT#1,"OUTPUT08;E?"
Line 2:
Query the error status (ERROR LED should be on).
PRINT#1,"ENTER08",
INPUT#2,A$,
PRINT A$
Line 5:
Display shows:
E1-Unrecognized Command
(ERROR LED
should be off)
EXAMPLE 3: Error is cleared.
PRINT#1,"OUTPUT08;E?"
Line 1:
Query the error status.
PRINT#1,"ENTER08",
INPUT#2,A$
PRINT A$
Line 4:
Display shows
E0
because the previous error condition was cleared
after reading the error status.
EXAMPLE 4: Invalid Command Parameter.
PRINT#1,"OUTPUT08;P8X"
Line 1:
Send command with an invalid option (no
P8
command option exists).
PRINT#1,"OUTPUT08;E?"
Line 2:
Query the error status (ERROR LED should be on).
PRINT#1,"ENTER08",
INPUT#2,A$,
PRINT A$
Line 5:
Display shows:
E2-Invalid Parameter
(ERROR LED should be
off).
EXAMPLE 5: Command Conflict Error. (See Next Page.)
Digital488/80A User’s Manual
967695
Digital488/80A Commands 51
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