READ Subsystem
READ?
Changes the state of the triggering system from "idle" to "wait-for-trigger". Scanning will begin when the specified
trigger conditions are satisfied following the receipt of the READ? command. Readings are then sent to reading
memory and the instrument's output buffer.
Parameter Typical return
(none) (none)
Use the READ? command with CONFigure. The READ? command places the instrument in the "wait-for-trigger" state, scans the specified
channels when the rear-panel Ext Trig Input line is pulsed (low by default), and then sends the readings to reading memory and the instru-
ment's output buffer.
CONF:VOLT:DC 10,0.003,(@103,108)
TRIG:SOUR EXT
READ?
Typical response: +4.27150000E-03,+1.32130000E-03
– Sending the READ? command is equivalent to sending the INITiate command followed immediately by the
FETCh? command.
– You can save up to 100,000 readings in reading memory and all readings are automatically time stamped. If read-
ing memory overflows, the new readings will overwrite the first (oldest) readings saved; the most recent readings
are always preserved. No error is generated, but the Reading Memory Overflow bit (bit 12) is set in the Ques-
tionable Data Register's condition register (see STATus Subsystem).
– The READ? query is not valid with the *TRG command (used with TRIGger:SOURce BUS command for software
triggering).
– The instrument clears all readings from reading memory when a new scan is initiated, or after a Factory Reset
(*RST command).
30
Keysight DAQ970A/DAQ973A Programming Guide
2 SCPI Programming
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