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 runs away or signal loss prevents timely feeding, the timer overflows and triggers a reset or safe shutdown. Industrial remote control receivers have a built-in watchdog that implements signal-loss protection: outputs are automatically cut off if no valid signal is received within 1 second. This is a critical circuit for equipment safety — standard on both LDER and XINGJIA.
| Principle | Timer + feed the dog |
| Function | Prevents loss of control |
| Application | Signal-loss protection |
Note:Signal-loss protection relies on the watchdog — be sure to test it regularly.