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

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Agilent Technologies E1301B, E1300B, 75000 SERIES B Device Clear DCL or Selected Device Clear SDC, Local Lockout LLO