Chapter 2 Installation 25
Watchdog timer configuration
An on-board watchdog timer reduces the chance of disruptions
which EMP (electro-magnetic pulse) interference can cause. This
is an invaluable protective device for standalone or unmanned
applications. Setup involves two jumpers and running the control
software (refer to Appendix A). The two jumpers are:
Watchdog timer enable/disable (J25)
You can enable or disable the watchdog timer by reading the card's
I/O ports with your program. Read address 443 hex to enable and
refresh the watchdog or address 043 to disable the watchdog. For
information on programming the watchdog timer see Appendix A.
Configure the watchdog timer to be enabled or disabled via a two-
pin jumper (J25) as shown below:
Watchdog timer enable/disable
*Enable
Disable
J25
Watchdog timer action (J23, J24)
When the watchdog timer activates (CPU processing has come to
a halt), it can reset the system or generate an interrupt on IRQ15.
This can be set via two 2-pin jumpers (J23, J24) as shown below:
Watchdog timer invokes system reset
*Enable
Disable
J23
Watchdog timer invokes IRQ15
*Enable
Disable
J24
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