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Remote Operation
Changing Between Remote and Local Operation
4
4-9
Front panel operation is disabled except for the LOCAL (0 key). Pressing 0, using
RS-232 to send the command LOCAL, or IEEE-488 to send the GTL (Go To
Local) message returns the Calibrator to the local state.
Remote with Lockout State
When the Calibrator is placed in lockout, either via RS-232 LOCKOUT command,
or via the IEEE-488 message LLO, the 525B front panel controls are totally locked
out. The top line of the display changes to: REM.
To return the Calibrator to the local with lockout state, send the RS-232 LOCAL
command or the IEEE-488 GTL (Go To Local) message.
Table 4-2 summarizes the possible Operating state transitions. (For more
information on IEEE-488 GPIB messages, see “IEEE-488 Overview.”
Table 4-2. Operating State Transitions
From To
Front
Panel
GPIB
Message
Serial
Command
Local
Remote MLA (REN True) REMOTE
Local with Lockout LLO LOCKOUT
Remote
Local Local softkey GTL or REN False LOCAL
Remote with Lockout LLO LOCKOUT
Local with Lockout
Local REN False LOCAL
Remote with Lockout MLA (REN True) REMOTE
Remote with Lockout
Local REN False LOCAL
Local with Lockout GTL
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