REM every line starting with REM is a commentary line and will not be executed.
REM simple script, to reset the timer of a USB Hardware Watchdog to 180seconds every 10seconds, please put this script into the startup list of Windows.

REM the COM port of your Watchdog
set portname=COM5

REM the time as hexadecimal value, this value multiplied by 10 is the timeout of the Watchdog, at which your Computer will be resetted
set timeout=12

REM the time in seconds how often the device-timer will be resetted
set interval=10

REM setting up COM port with correct settings
mode %portname%:96,n,8,1

echo %timeout%>timeout.txt
certutil -decodehex timeout.txt timeout.bin

:loop
copy timeout.bin \\.\%portname%
timeout %interval%
goto loop