GPIB Operation
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Group Execute Trigger
Remote ENable
Local LOckout
Go To Local
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buffers, aborts the interpretation of the current command (if any)
and clears any pending commands. Status registers and status en-
able registers are not cleared. Although DCL has an immediate
effect it can take several seconds to execute this command if the
instrument is busy.
The Group Execute Trigger message (GET) causes the oscillo-
scope to arm the trigger system. It is functionally identical to the
"*TRG" command.
This interface message is executed when the controller holds the
Remote ENable control line (REN) true and configures the instru-
ment as a listener. The REMOTE LED on the front panel lights up
to indicate that the instrument is set to the remote mode. All the
front-panel controls are disabled except the left-hand menu but-
tons, the intensity controls and the LOCAL button. The menu
indications on the left-hand side of the screen no longer appear
since menus cannot now be operated manually. Whenever the
controller returns the REN line to false, all instruments on the bus
return to LOCAL. Individual instruments can be returned to LO-
CAL with the Go To Local message (see below).
As a rule, remote commands are only executed when the instru-
ment is in the remote state, whereas queries are always executed.
Local front-panel control may be regained by pressing the LO-
CAL push button, unless the instrument was placed in the Local
LOckout (LLO) mode.
The Local LOckout command (LLO) causes the LOCAL button
on the front panel of the oscilloscope to be disabled. The LLO
command can be sent in local or remote mode but only becomes
effective once the instrument has been set to the remote mode.
The Go To Local message (GTL) causes the instrument to return
to the local mode. All front-panel controls become active and the
menus on the left-hand side of the screen reappear. Thereafter,
whenever the instrument is addressed as a listener it will be imme-
diately set to the remote state again.
Note that a GTL message does not clear the local lockout if it was
set. Thus, whenever the instrument returns to the remote state the
local lockout mode would immediately be effective again.
A command string should not be immediately followed by a GTL
message. Since GTL is executed at once, the instrument may al-
ready be returned to the local state before the commands in the
input buffer are interpreted. Therefore, the instrument may refuse
to execute them if they require the instrument to be in REMOTE.
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