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Device Clear (DCL) or
Selected Device Clear
(SDC)
DCL clears all instruments in the mainframe. SDC clears a specific instrument.
The purpose of DCL or SDC is to prepare one or more instruments to receive
and execute commands (usually *RST). DCL or SDC do the following to each
instrument:
• Clear the input buffer and output queue.
• Reset the command parser.
• Disable any operation that would prevent *RST from being executed.
• Disable the Operation Complete and Operation Complete Query modes.
DCL or SDC do not affect:
• Any settings or stored data in the instrument (except the Operation
Complete and Operation Complete Query modes)
• Front panel operation
• Any instrument operation in progress (except as stated above)
• The status byte (except for clearing the Message Available bit as a result
of clearing the output queue).
Examples CLEAR 7 Clears all instruments
CLEAR 70900 Clears the System Instrument
Local Lockout (LLO) When an instrument is in remote mode, Local Lockout prevents an instrument
from being operated from the mainframe’s front panel.
Comments • Certain front panel operations such as menu control and display scrolling
are still active in Local Lockout mode.
• If the instrument is in the local state when you send LOCAL LOCKOUT,
it remains in local. If the instrument is in the remote state when you send
LOCAL LOCKOUT, front panel control is disabled immediately for that
instrument.
• After executing LOCAL LOCKOUT, you can enable the keyboard by
sending the LOCAL 7 command or by cycling power. The LOCAL 709ss
(ss = secondary address) command enables the front panel for that
instrument but a subsequent remote command disables it. Sending the
LOCAL 7 command removes lockout for all instruments and places them
in the local state.
Examples 10 REMOTE 70900 Sets the System Instrument
remote state
20 LOCAL LOCKOUT 7 Disables front panel control for
the System Instrument and all
other instruments that were in
the remote state.
30 END
System Instrument Command Reference 7-73