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Specify callback function to execute when predefined period passes


You configure TimerFcn to execute a callback function when a timer event occurs. A timer event occurs when the time specified by the TimerPeriod property passes. Time is measured relative to when the object is connected to the instrument with fopen.

    Note   A timer event can be generated at any time during the instrument control session.

If the RecordStatus property value is on, and a timer event occurs, the record file records this information:

  • The event type as Timer

  • The time the event occurred using the format day-month-year hour:minute:second:millisecond

Some timer events might not be processed if your system is significantly slowed or if the TimerPeriod value is too small.

To learn how to create a callback function, refer to Creating and Executing Callback Functions.



Any instrument object

Read only


Data type

Callback function


The default value is an empty character vector.

See Also


fopen, record


RecordStatus, TimerPeriod

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