HP 8642A Operation And Calibration Manual

Operation
..
Local
Lockout
Clear
Lockout!
Set Local
3-26
Model 8642A/B
LOCAL LOCKOUT, SET LOCAL
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 I LOCAL I key.
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 ( POWER 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 (Fiat is, the
system
controller will lose control of a system element).
L Instrument configuration is reset to the power-up conditions listed in
the Detailed Operating Instruction, Instrument Preset, Partial Preset
(page 3-137).

HP 8642A Specifications

General

Brand	HP
Model	8642A
Category	Inverter
Language	English