Model 6485 Picoammeter Instruction Manual Remote Operation 9-7
Primary address
Model 6485 ships from the factory with a GPIB address of 14. When the instrument pow-
ers up, it momentarily displays the primary address. You can set the address to a value of
0-30. Do not assign the same address to another device or to a controller that is on the
same GPIB bus.
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 units 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 Model 6485 by the controller to set up the instru-
ment 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.
Table 9-1
General bus commands
Command Effect on Model 6485
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 6485.
DCL Returns all devices to known conditions.
SDC Returns Model 6485 to known conditions.
GET Initiates a trigger.
SPE, SPD Serial polls Model 6485.
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