Tektronix DPO4000 User Manual download pdf (Page 520)

100

101

Status and Events

/* Take amplitu

de measur ement */

MEASUREMENT:IMMED:VALUE

This sequence

lets you create your own wait loop rather than using the *WAI

command. The BUSY? query helps you avoid time-outs caused by writing too

many commands to the input buffer. The controller is still tied up though, and

the repeated BUSY? query will result in bus trafﬁc.

Using the *OPC Command

If the corresponding status registers are enabled, the *OPC command sets the

OPC bit in the Standard Event Status Register (SESR) when an operation is

complete. You achieve synchronization by using this command with either a

serial poll or service request handler.

Serial Poll Method: Enable the OPC bit in t he Device Event Status Enable

and *ESE commands.

When the operation is complete, the OPC bit in the Standard Event Status Register

(SESR) will be enabled and the Event Status Bit (ESB) in the Status Byte Register

will be

enabled.

The same command sequence using the *OPC command for synchronization with

seria

l polling looks like this:

/* Set up conditional ac quisition */

ACQU

IRE:STATE OFF

SELECT:CH1 ON

HORIZONTAL:RECORDLENGTH 1000

ACQUIRE:MODE SAMPLE

ACQUIRE:STOPAFTER SEQUENCE

/* Enab le the s tatus registers */

SE 1

*ESE 1

*SRE 0

/* Acqu ire waveform data */

ACQUIRE:STATE ON

/* Set up the measurement parameters */

MEASUREMENT:IMMED:TYPE AMPLITUDE

MEASUREMENT:IMMED:SOURCE CH1

/* Wait until the acquis ition is complete before taking the

measurement.*/

*OPC

While s erial poll = 0, keep loopi ng

/* Take amplitude measurement */

MEASUREMENT:IMMED:VALUE

This technique requires less bus trafﬁcthandidloopingonBUSY.

3-10 MSO4000 and DPO4000 Series Programmer Manual

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Tektronix DPO4000 User Manual Page 520

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