10-22 Remote Operations Model 6220/6221 Reference Manual
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General IEEE-488 bus commands
Commands and associated statements
General commands are those commands, such as DCL, that have the same
general meaning regardless of the instrument. Table 10-4 lists the general bus
commands.
REN (remote enable)
The remote enable command is sent to the Model 622x 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 true does not actually place the instrument in the remote state. You must
address the instrument to listen after setting REN true before it goes into remote.
Note that the instrument does not have to be in remote to be a talker.
Note that all front panel controls, except for LOCAL, POWER, and OUTPUT OFF
are inoperative while the instrument is in remote (OUTPUT ON is inoperative in
remote). You can restore normal front panel operation by pressing the LOCAL key.
IFC (interface clear)
The IFC command is sent by the controller to place all instruments on the bus in
the local, talker, listener idle states. The Model 622x responds to the IFC com-
mand by canceling front panel TALK or LSTN lights, if the instrument was previ-
ously 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 must set the IFC line true for a minimum
of 100µs.
Table 10-4
General bus commands
Command Effect on Model 622x
REN Goes into remote when next addressed to listen.
IFC Reset interface; all devices go into talker and listener idle states.
LLO LOCAL key and OUTPUT ON locked out.
GTL Cancel remote; restore front panel operation for Model 622x.
DCL Returns all devices to known conditions.
SDC Returns Model 622x to known conditions.
GET Initiates a trigger.
SPE, SPD Serial polls Model 622x.
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