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5.8.2 IFC (interface clear)
The IFC command is sent by the controller to place the Mod-
el 7001 in the local, talker, and listener idle states. The unit
responds to the IFC command by cancelling front panel
TALK or LISTEN lights, if the instrument was previously
placed in one of those states.
Note that this command does not affect the status of the in-
strument; settings, data, and event registers are not changed.
To send the IFC command, the controller need only set the
IFC line true for a minimum of 100µsec.
Programming Example Before demonstrating the IFC
command, turn on the TALK indicator with the following
statement:
ENTER 707; A$
At this point, the TALK light should be on. The IFC com-
mand can be sent by entering the following statement into
the computer:
ABORTIO 7
After the RETURN key is pressed, the TALK indicator turns
off, indicating that the instrument has gone into the talker
idle state.
5.8.3 LLO (local lockout)
The LLO command is used to prevent local operation of the
instrument. After the unit receives LLO, all its front panel
controls except POWER are inoperative. In this state, press-
ing LOCAL will not restore control to the front panel.
Programming Example The LLO command is sent by
entering the following statements:
REMOTE 707
LOCAL LOCKOUT 7
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After the second statement is executed, the instrument's front
panel controls are locked out, including the LOCAL key.
To restore front panel operation after asserting LLO, as in the
following example, enter:
LOCAL 7
5.8.4 GTL (go to local) and local
The GTL command is used to take the instrument out of the
remote state. Operation of the front panel keys is restored. If
LLO is in effect, the front panel LOCAL key will be disabled
when the Model 7001 is put into remote. To cancel LLO, you
must set REN false.
Programming Example Place the instrument in the re-
mote state with the following statement:
REMOTE 707
Now send GTL with the following statement:
LOCAL 707
Note that the instrument goes into the local state, and that op-
eration of the front panel keys has now been restored (assum-
ing that LLO is not in effect).
5.8.5 DCL (device clear)
The DCL command may be used to clear the Model 7001
and return it to a known state. Note that the DCL command
is not an addressed command, so all instruments equipped to
implement DCL will do so simultaneously.
When the Model 7001 receives a DCL command, it will
clear the Input Buffer and Output Queue, cancel deferred
commands, and clear any command that prevents the pro-
cessing of any other device command. A DCL will not affect
instrument settings, stored data, the channel list or scan list.
IEEE-488 Reference
5-27
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