Remote Commands
Commands
6
6-11
Coupled Commands
Coupled
x
These are called coupled commands
(examples: CUR_POST and OUT) because they “couple” in a compound command
sequence. Care must be taken to be sure the action of one command does not disable the
action of a second command and thereby cause a fault. For more information, see
“Coupled Commands” in Chapter 5.
CFREQ?
Overlapped
Coupled
IEEE-488
RS-232
Sequential
x
x
x
x
x
(Capacitance Frequency query) Returns the optimal frequency for stimulus when
measuring or calibrating capacitance output.
Response:
<value> of the optimal frequency
Example:
CFREQ?
returns
1.0E
+
2
Returns 100 Hz as the optimal frequency for the selected capacitance output (1.0
μ
F for
this example). The return is
0
if not sourcing capacitance.
CLOCK
Overlapped
Coupled
IEEE-488
RS-232
Sequential
x
x
x
x
x
(Real-Time Clock command) Sets the real time clock, time only, or date and time. To set
the date, the CALIBRATION switch must be in the ENABLE position.
Parameters: 1. (optional) year in the format
YYYY
2. (optional) month in the format
MM
3. (optional) day in the format
DD
4. hour in the format
HH
5. minute in the format
MM
6. second in the format
SS
Examples:
CLOCK 1998,6,1,9,52,10
sets clock to June 1, 1998, 9:52:10 AM
CLOCK 13,10,10
sets clock time only to 1:10:10 PM
CLOCK?
Overlapped
Coupled
IEEE-488
RS-232
Sequential
x
x
x
x
x
(Real_Time Clock query) Returns the date and time the real time clock.
Response:
(character)
1. date in the format YYYY-MM-DD
(character)
2. time in the format HH:MM:SS
Example:
CLOCK?
returns
1998-12-04,13:03:50
The clock is set to December 4, 1998, 13:03:50.
*CLS
Overlapped
Coupled
IEEE-488
RS-232
Sequential
x
x
x
x
x
(Clear Status command) Clears the ESR, ISCR0, ISCR1, the error queue, and the RQS
bit in the status byte. This command terminates pending operation complete commands
(*OPC or *OPC?).
Parameter: (None)
Example:
*CLS
Clear the ESR, ISCR0, ISCR1, the error queue, and the RQS bit in the status byte.
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