Period of time between timer events
TimerPeriod specifies the time, in seconds, that must pass before the
callback function specified for
TimerFcn is called. Time is measured
relative to when the serial port object is connected to the device with
Some timer events might not be processed if your system is significantly slowed or if the
TimerPeriod value is too small.
The default value is 1 second. The minimum value is 0.01 second.