Tektronix DPO4000 User Manual download pdf (Page 521)

100

101

Status and Events

Service Reques

t Method: Enable the OPC bit in the Device Event Status Enable

and *ESE commands.

You can also enable service requests by setting the ESB bit in the Service Request

Enable Register (SRER) using the *SRE command. When the operation is

complete, the oscilloscope will generate a Service Request.

The same command sequence using the *OPC command for synchronization

looks like this

/* Set up conditional acq uisition */

ACQUIRE:STATE OFF

SELECT:CH1 ON

HORIZONTAL:RECORDLENGTH 1000

ACQUIRE:MODE SAMPLE

ACQUIRE:STOPAFTER SEQUENCE

/* Enab le the st atus 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 acquisi tion is complete 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

This technique is efﬁcient but requires sophisticated programming.

Usingthe*OPC?Query

The *OPC? query places a 1 in the Output Queue once an operation that generates

an OPC message is complete. A time out could occur if you try to read the output

queue before there is any data in it.

The s

ame command sequence using the *OPC? query for s ynchronization looks

like this:

/* Set up conditional acq uisition */

ACQUIRE:STATE OFF

SELECT:CH1 ON

HORIZONTAL:RECORDLENGTH 1000

ACQUIRE:MODE SAMPLE

ACQUIRE:STOPAFTER SEQUENCE

MSO4000 and DPO4000 Series Programmer Manual 3-11

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Tektronix DPO4000 User Manual Page 521

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