Keithley 2016 - READ? Command

READ? command
:READ?
Description Typically, this command is used with the instrument in the “one-shot”
measurement mode to trigger and acquire a specified number of readings.
The :SAMPle:COUNt command is used to specify the number of readings
(see Trigger Subsystem). Note that the readings are stored in the buffer.
When this command is sent, the following commands execute in the order
that they are presented:
:ABORt
:INITiate
:FETCh?
When :ABORt is executed, if continuous initiation is disabled, the
instrument goes into the idle state. If continuous initiation is enabled, the
operation re-starts at the beginning of the Trigger Model.
If the instrument is in the idle state, :INITiate takes the instrument out of the
idle state. If continuous initiation is enabled, (:INITiate:CONTinuous ON),
then the :INITiate command generates an error and ignores the command.
See the :FETCh? command for more details. Note that an “Init ignored” error
will not cancel the execution of the :FETCh? command.
NOTE You cannot use the :READ? command if sample count >1 (see Trigger Subsystem)
and there are readings stored in the buffer (error -225, out of memory). Either set
sample count to one or clear the buffer.
See Appendix C for an example program using the READ? command.
NOTE This command is valid while :OUTPut:MODE FIXED. Do not issue this command
while in sweep mode (:OUTPut:MODE LIST). A value of +811 (not permitted in LIST
output mode) will be returned if this command is issued while in sweep mode. Refer
to Appendix B for a complete list of status and error messages.
SCPI Command Reference 5-5