General Bus Commands; Ren (Remote Enable) - Keithley 7002 Instruction Manual

5.8

General bus commands

General bus commands are those commands such as DCL
that have the same general meaning regardless of the instru-
ment. Commands supported by the Model 7002 are listed in
Table 5-3 which also lists BASIC statements necessary to
send each command. Note that commands requiring that a
primary address be specified assume that the primary address
is set to 7. This is the address that is set at the factory.

5.8.1 REN (remote enable)

The remote enable command is sent to the Model 7002 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. Instead the instrument must be addressed to lis-
ten after setting REN true before it goes into remote.
Table 5-3
General bus commands and associated BASIC statements
Command
REN
IFC
LLO
GTL
DCL
SDC
GET
SPE, SPD
HP BASIC 4.0
statement Effect on Model 7002
REMOTE 7 Goes into effect when next addressed to listen.
ABORT 7 Goes into talker and listener idle states.
LOCAL LOCKOUT 7 LOCAL key locked out.
LOCAL 707 Cancel remote, restore front panel operation.
CLEAR 7 Returns 7002 to known conditions.
CLEAR 707 Returns all devices to known conditions.
TRIGGER 707 Initiates a trigger.
SPOLL (707) Serial Polls the Model 7002.
Note that the instrument need not be in remote to be a talker.
Programming Example  This sequence is automatically
performed by the controller when the following is typed into
the keyboard.
REMOTE 707
After the RETURN key is pressed, the instrument is in the
remote state, as indicated by the REM annunciator. If not,
check to see that the instrument is set to the proper primary
address 07, and check to see that the bus connections are
properly made.
Note that all front panel controls except for LOCAL (and, of
course, POWER) are inoperative while the instrument is in
remote. You can restore normal front panel operation by
pressing the LOCAL key.
IEEE-488 Reference
5-29