Alcorn Mcbride V+ series, User Manual

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6-24 Advanced WinScript Programming
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In this manner, you can check individual commands sent back and forth between
boxes. Sometimes, where you want to know
immediately if a Show Controller
has failed, and not wait until a message is sent between them, you can
implement a “Watch Dog Timer”, which will notify a Show Controller if a
subsystem Show Controller has failed. You can even put a watchdog timer in
the subsystem to watch over the main Show Controller. The procedure is the
same.
Here is such an example. If the subsystem IO64 fails entirely, or the serial port
fails, or the cable fails or falls off, the V16 will know about it, and alert some
theme park wide central computer. The V16 could even flash the lights in the
employee bathroom, or log the time of the failure, if a Real Time Clock is
installed.