定时打印间隔时间可通过DIP开关提供四种选择。

DIP switch attached to offers four time intervals for regular printout.

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尝试以同样的时间间隔并以相同的音调吹两声低音调口哨，您将看到文本 “two low” 打印到屏幕上。

Try your double low-tone whistle with the same temporal spacing and the same notes, and you will see the text "two low" printed to the screen. If you want to see the functioning of the cmdWhistle.pl

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但是由于首先执行优先级为4的线程，因此在五秒钟的执行时间间隔中，它分得的时间稍多一些并且打印的循环计数也稍大一些。

But, because the thread at priority 4 executes first, it should have a slightly larger share of the five-second execution interval and print out a higher loop count.

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