Query – Measurement Computing Digital488/80A User Manual
Page 82
? - Query
SYNTAX
?
(Command Support) Returns present configuration or mode of the command
preceding the
?
.
Note:
One exception to this command description is the View Version (
V?
) command
which is not related to the View Configuration (
V
) command.
DESCRIPTION
All Digital488/80A commands offer a Query (
?
) option which may be used to determine the present configuration or
mode of a command previously executed. To use this option, the first letter of the command is used, followed by a
question mark (
?
). One exception to this command description is the View Version (
V?
) command which is not related
to the View Configuration (
V
) command.
Any number of these Query commands may be combined into one string to allow the user to construct a specialized
status command requesting the Digital488/80A to return only that information which is of interest for a given
application. The Execute (
X
) command is not needed when using the Query option of a command.
EXAMPLE 1: Channel 1 SRQ Status.
PRINT#1,"CLEAR08"
Line 1: Reset the Digital488/80A.
PRINT#1,"OUTPUT08;M4X"
Line 2: Select
SRQ
on IEEE 488 bus error.
PRINT#1,"OUTPUT08;M?"
Line 3: Determine the last Service Request Mask (
M
) command executed.
PRINT#1,"ENTER08"
Line 4: Read data from the Digital488/80A.
INPUT#2,A$,
PRINT A$
Line 6: Display shows:
M4
EXAMPLE 2: Using the User Status (
U
) Command to Return Channel 1 Status.
PRINT#1,"CLEAR08"
Line 1: Reset the Digital488/80A.
PRINT#1,"OUTPUT08;U0X"
Line 2: Request the status of Channel 1.
PRINT#1,"ENTER08"
Line 3: Read data from the Digital488/80A.
INPUT#2,A$,
PRINT A$
Line 5: Display shows the status message:
*.*C#E#F#G#I###K#L####M###P#R#S##Y#
EXAMPLE 3: Using a Query (
?
) Command String to Return the Same Channel 1 Status.
PRINT#1,"CLEAR08"
Line 1: Reset the Digital488/80A.
PRINT#1,"OUTPUT08;V?C?E?
F?G?I?K?L?M?P?R?S?Y?X"
Line 2: Request the status of Channel 1.
PRINT#1,"ENTER08"
Line 3: Read data from the Digital488/80A.
INPUT#2,A$,
PRINT A$
Line 5: Display shows the same status message:
*.*C#E#F#G#I###K#L####M###P#R#S##Y#
76 Digital488/80A Commands
967695
Digital488/80A User's Manual