Specify the callback function to execute when a predefined period of time 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 serial port object is connected to the device with fopen.
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, see Creating and Executing Callback Functions.