The watchdog timer is a feature on the Brainboxes ED range that performs a specific operation after a certain period of time if something goes wrong with the system and the system does not recover on its own. The watchdog timer can time out under 1 of 2 user programmable circumstances:

• Communication link – The host computer has not communicated with the ED within the timeout period.
• Hardware – The firmware inside the ED has not reset the timer.

In Brainboxes ED products there are 5 ASCII commands that deal with the watchdog:

~**	No Response	Host Ok	All ‘ED’ Devices
~AA0	!AASS	Read Watchdog Timeout Status	All ‘ED’ Devices
~AA1	!AA	Reset Watchdog Timeout Status	All ‘ED’ Devices
~AA2	!AAVV	Read Watchdog Timeout Settings	All ‘ED’ Devices
~AA3EVV	!AA	Set Watchdog Timeout Value	All ‘ED’ Devices

You can also configure the safe value on the ED device’s webpage: