Operation Model 8642A/B
LOCAL
LOCKOUT,
SET LOCAL
Local
Lockout The Local Lockout message is the way the controller sends the Local Lockout (LLO) bus
command. The Signal Generator responds to the Local Lockout message by disabling the
front-panel [ LOCAL 1 key.
Clear
Lockout/
Set Local The Clear Lockout/Set Local message is the way the controller sets the Remote Enable
(REN) bus control line false. The Signal Generator returns to local mode when it receives
the Clear Lockout/Set Local message. No instrument settings are changed by the
transition from remote to local.
When in local lockout, the Signal Generator can be returned to local only by the
controller (using the Local or Clear Lockout/Set Local messages), or by setting the Power
switch to Standby and back to on, or by removing the bus cable.
NOTE
Return-to-local while in local lockout can be accomplished by switching
the fPOWER I from STBY to ON. Returning to local control in this way
has the following disadvantages:
1.
It defeats the purpose and advantages of local lockout (that is, the
system controller will lose control of a system element).
2.
Instrument configuration is reset to the power-up conditions listed in
the Detailed Operating Instruction, Instrument Preset, Partial Preset
(page 3-137).
3-26
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