Keithley 6487, Reference Manual

Page: 152 / 338

Model 6487 Reference Manual Remote Operation 9-7
Usually controller addresses are 0 or 21, but see the controllers instruction manual for
details. Make sure the address of the controller is the same as that specified in the control-
lers programming language. To make sure the unit’s interface is properly selected and con-
figured or to check or change the GPIB address, refer to
“Selecting and configuring an
interface,” page 9-2 .
General IEEE-488 bus commands
Commands and associated statements
General commands are those commands, such as DCL, that have the same general mean-
ing regardless of the instrument.
Table 9-1 lists the general bus commands.
REN (remote enable)
The remote enable command is sent to the Model 6487 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 and POWER, are inoperative while
the instrument is in remote. You can restore normal front panel operation by pressing the
LOCAL key.
Table 9-1
General bus commands
Command Effect on Model 6487
REN Goes into remote when next addressed to listen.
IFC Reset interface; all devices go into talker and listener idle states.
LLO LOCAL key locked out.
GTL Cancel remote; restore front panel operation for Model 6487.
DCL Returns all devices to known conditions.
SDC Returns Model 6487 to known conditions.
GET Initiates a trigger.
SPE, SPD Serial polls Model 6487.