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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 525A 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
Remote
MLA (REN True)
REMOTE
Local
Local with
Lockout
LLO
LOCKOUT
Local
Local softkey
GTL or REN
False
LOCAL
Remote
Remote with
Lockout
LLO
LOCKOUT
Local
REN False
LOCAL
Local with
Lockout
Remote with
Lockout
MLA (REN True)
REMOTE
Local
REN False
LOCAL
Remote with
Lockout
Local with
Lockout
GTL
Summary of Contents for 525A
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