Control Functions
PSI BOX PLUS+ Reference
LLO.
Sends The Local Lockout Command.
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Purpose.
The universal command Local Lockout is sent to the
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IEEE bus.
The LLO command is used to tell all the bus devices to
ignore their front panel, local, controls and respond only to the
PSI BOX.
The LLO command is used to disable a device from
responding to its own front panel controls. This is necessary
when you want the instrument to be totally under the control of
the PSI BOX. It prevents accidental pushing of the devices
buttons interfering with its operation.
The device will return to local control when it receives the
GTL command, or when the IEEE REN line goes false.
The PSI BOX asserts ATN and becomes the active
controller, then the IEEE command LLO, hex 11h decimal 17, is
sent over the IEEE bus. After the command has been sent the
ATN remains true, PSI BOX is the active controller.
The LLO command is used automatically in the LOCAL
LOCKOUT routine but it can be called separately to initiate
your own return to local routines. The LLO command can also
be sent by using CMD 17 or CMD 145
Format.
LLO
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Params.
None.
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Returns.
None.
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Example.
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_
BUS LLO
Bus Activity.
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_
assert ATN if not already so
LLO
Chapter 8
Page 109
