Programming The Watchdog Timer - Advantech PPC-153 User Manual

B.1 Programming the Watchdog Timer
To program the watchdog timer, you must write a program which writes
I/O port address 443 (hex). The output data is a time interval value. The
value range is from 01 (hex) to 3E (hex), and the related time interval is
from 1 sec. to 62 sec.
Data
01
02
03
04
•
•
•
3E
After data entry, your program must refresh the watchdog timer by
rewriting the 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).
130 PPC-153 User's Manual
Time Interval
1 sec.
2 sec.
3 sec.
4 sec.
•
•
•
62 sec.