Section 11: Remote operations
Model 6517B Electrometer Reference Manual
11-8
6517B-901-01 Rev. C / August 2015
REN (remote enable)
The remote enable command is sent to the Model 6517B by the controller to set up the instrument for
remote operation. Generally, the instrument should be placed in the remote mode before you attempt
to program it over the bus. Simply setting REN to true does not actually place the instrument in the
remote state. Instead, the instrument must be addressed to listen after setting REN to true before it
goes into remote.
Note that the instrument need not be in remote to be a talker.
IFC (interface clear)
The IFC command is sent by the controller to place the Model 6517B in the local, talker, and listener
idle states. The unit responds to the IFC command by canceling front panel
TALK
or
LISTEN
lights, if
the instrument was previously placed in one of those states.
Note that this command does not affect the status of the instrument; settings, data, and event
registers are not changed.
To send the IFC command, the controller need only set the IFC line true for a minimum of
100 µseconds
LLO (local lockout)
The LLO command is used to prevent local operation of the instrument. After the unit receives LLO,
all its front panel controls except POWER are inoperative. In this state, pressing
LOCAL
does not
restore control to the front panel. The GTL command restores control to the front panel.
GTL (go to local)
The GTL command is used to take the instrument out of the remote state. Operation of the front panel
keys is also restored by GTL.
DCL (device clear)
The DCL command may be used to clear the IEEE 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 do so simultaneously.
When the Model 6517B 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 instruments instead of clearing all instruments
simultaneously, as is the case with DCL.
