Sdc (Selective Device Clear); Get (Group Execute Trigger); Spe, Spd (Serial Polling) - Keithley 7001 Instruction Manual

IEEE-488 Reference
Programming Example  Use the following statement to
perform a DCL:
CLEAR 7
When the RETURN key is pressed, the instrument will per-
form the DCL.

5.8.6 SDC (selective device clear)

The SDC command is an addressed command that performs
essentially the same function as the DCL command. Howev-
er, since each device must be individually addressed, the
SDC command provides a method to clear only selected in-
struments instead of clearing all instruments simultaneously,
as is the case with DCL.
Programming Example  Use the following statement to
perform an SDC:
CLEAR 707
This sends the following IEEE-488 commands: UNT UNL
LISTEN 07 SDC. When the statement is executed, the in-
strument performs the SDC.

5.8.7 GET (group execute trigger)

GET is a GPIB trigger that is used as an arm, scan and/or
channel event to control the scanning process. The Model
7001 will react to this trigger if it is the programmed control
source. The control source is programmed from the SCPI
:TRIGger Subsystem (see paragraph 5.18).
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With the instrument programmed and waiting for a GPIB
trigger, the following programming statement will provide
the GET:
TRIGGER 707
This sends IEEE-488 commands UNT UNL LISTEN 07
GET. When the ENTER key is pressed, the trigger event oc-
curs. (The command TRIGGER 7 just sends GET. Any other
listeners are triggered when the ENTER key is pressed.)

5.8.8 SPE, SPD (serial polling)

The serial polling sequence is used to obtain the Model 7001
serial poll byte. The serial poll byte contains important infor-
mation about internal functions, as described in paragraph
5.6.8. Generally, the serial polling sequence is used by the
controller to determine which of several instruments has re-
quested service with the SRQ line. However, the serial poll-
ing sequence may be performed at any time to obtain the
status byte from the Model 7001.
Programming Example  The SPOLL statement automat-
ically performs the serial poll sequence. To demonstrate se-
rial polling, enter in the following statements into the
computer:
S=SPOLL (707)
PRINT "SPOLL BYTE =";S
After the first statement, the controller conducts the serial
polling sequence. After the second statement is executed, the
decimal value of the serial poll byte is displayed on the con-
troller CRT.