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Status and Events
Thesamecomman
d sequence using the *OPC command for synchronization
looks like this
/* Set up conditional acquisition */
ACQUIRE:STATE OFF
SELECT:CH1 ON
ACQUIRE:MODE SAMPLE
ACQUIRE:STOPAFTER SEQUENCE
/* Enab le the status registers */
DESE 1
*ESE 1
*SRE 32
/* Acqu ire waveform data */
ACQUIRE:STATE ON
/* Set up the measurement parameters */
MEASUREMENT:IMMED:TYPE AMPLITUDE
MEASUREMENT:IMMED:SOURCE CH1
/* Wait until the acquisition is complet e before taking the
measurement*/
*OPC
The program can now do different tasks such as talk to other devices. The SRQ,
when it comes, interrupts those tasks and returns control to this task.
/* Take amplitude measurement */
MEASUREMENT:IMMED:VALUE?
Usingthe*OPC?Query
The *OPC? query places a 1 in the Output Queue once an operation that generates
an OPC message is complete. The *OPC? query does not return until all pending
OPC operations have completed. Therefore, your time-out must be set to a time at
least if the longest expected time for the operations to complete.
The same command sequence using the *OPC? query for synchronization looks
like this:
/* Set up single sequence acquisition */
ACQUIRE:STATE OFF
SELECT:CH1 ON
ACQUIRE:MODE SAMPLE
ACQUIRE:STOPAFTER SEQUENCE
/* Acqu ire waveform data */
ACQUIRE:STATE ON
/* Set up the measurement parameters */
MEASUREMENT:IMMED:TYPE AMPLITUDE
MEASUREMENT:IMMED:SOURCE CH1
/* Wait until the acquisition is complet e before taking the
measurement*/
*OPC?
Wait for read from Output Queue.
TDS200, TDS1000/2000, TDS1000B/2000B, TDS2000C, TPS2000 Programmer 3-11