Model 6220/6221 Reference Manual
Remote Operations 10-23
Return to
LLO (local lockout)
Use the LLO command to prevent local operation of the instrument. After the unit
receives LLO, all its front panel controls except POWER and OUTPUT OFF are
inoperative (OUTPUT ON is inoperative in LLO). In this state, pressing LOCAL will
not restore control to the front panel. The GTL command restores control to the
front panel.
GTL (go to local)
Use the GTL command to put a remote mode instrument into local mode. The
GTL command also restores front panel key operation.
DCL (device clear)
Use the DCL command to clear the GPIB interface and return it to a known state.
Note that the DCL command is not an addressed command, so all instruments
equipped to implement DCL will do so simultaneously. When the Model 622x
receives a DCL command, it clears the input buffer and output queue, cancels
deferred commands, and clears any command that prevents the processing of
any other device command. A DCL does not affect instrument settings and stored
data.
SDC (selective device clear)
The SDC command is an addressed command that performs essentially the same
function as the DCL command. However, since each device must be individually
addressed, the SDC command provides a method to clear only selected instru-
ments instead of clearing all instruments simultaneously, as is the case with DCL.
GET (group execute trigger)
GET is a GPIB trigger that is used as an event to control operation. The Model
622x reacts to this trigger if it is the programmed control source. The control
source is programmed from the SCPI TRIGger subsystem.
SPE, SPD (serial polling)
Use the serial polling sequence to obtain the Model 622x serial poll byte. The
serial poll byte contains important information about internal functions. Generally,
the serial polling sequence is used by the controller to determine which of several
instruments has requested service with the SRQ line. However, the serial polling
sequence may be performed at any time to obtain the status byte from the Model
622x.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
Summary of Contents for 6220
Page 16: ...Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com...
Page 24: ...Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com...
Page 453: ...Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 TestEquipmentDepot com...
