Detailed Answer
A watchdog timer is a hardware mechanism that monitors system operation: when the system is running normally it periodically 'feeds the dog' to reset the timer; if the program crashes or the signal is lost so the watchdog is not fed in time, the timer overflows and triggers a reset or safe shutdown. Industrial remote control receivers have a built-in watchdog that implements loss-of-signal protection: output is automatically cut off if no valid signal is received for 1 second. This is a key circuit for equipment safety, standard on both LIDER and XINGJIA.
| Principle | Timer + watchdog feed |
| Function | Prevents runaway |
| Application | Loss-of-signal protection |
Note:Loss-of-signal protection relies on the watchdog; be sure to test it regularly.