Keithley 6485, User Manual, Page: 90 / 115

7-4 Remote Operation and Commands Model 6485 and 6487 User’s Manual
Front panel GPIB operation
Error and status messages
See Appendix B in the Model 6485 Instruction Manual or Model 6487 Reference Manual
for a list of error and status messages associated with IEEE-488 programming.
GPIB status indicators
REM shows when the instrument is in the remote state, TALK is on when the instrument
is in the talker active state, and LSTN is on when the Model 6485/6487 is in the listener
active state. SRQ shows when the instrument has generated a service request.
LOCAL key
The LOCAL key cancels the remote state and restores local operation of the instrument.
Pressing the LOCAL key also turns off the REM indicator and returns the display to nor-
mal if a user-defined message was displayed. If the unit is in LOCAL (not in remote), the
LOCAL key acts as a configure key (see
“Model 6485 front panel summary,” page 1-8 or
“Model 6487 front panel summary,” page 1-13 .)
If the LLO (Local Lockout) command is in effect, the LOCAL key is also inoperative.
Remote commands
General bus commands
General bus commands are listed in Table 7-1 . These commands are not available for the
RS-232 interface.
Table 7-1
General bus commands
Command Effect on Model 6485/6487
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 6485/6487.
DCL Returns all devices to known conditions.
SDC Returns Model 6485/6487 to known conditions.
GET Initiates a trigger.
SPE, SPD Serial polls Model 6485/6487.