Advantech IPC-610B Manual page 119

After data entry, your program must refresh the watchdog timer by
rewriting I/O port 443 (hex) while simultaneously setting it. When
you want to disable the watchdog timer, your program should read I/O
port 443 (hex).
The following example shows how you might program the watchdog
timer in BASIC:
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REM Watchdog timer example program
OUT &H443, data REM
GOSUB 1000 REM
OUT &H443, data REM
GOSUB 2000 REM
OUT &H443, data REM
X=INP (&H443) REM
END
REM Subroutine #1, your application task
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RETURN
REM Subroutine #2, your application task
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RETURN
Appendix A Programming the Watchdog Timer
Start and restart the watchdog
Your application task #1,
Reset the timer
Your application task #2,
Reset the timer
Disable the watchdog timer
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