Communication serial port error of room card system in Smart Hotel 5.7.

1. When the green light of the legal card door opening alarm flashes, there will be a short "beep" sound, and the door lock cannot be opened. The solution at this time is to replace the battery.

2. System identification error. When the red light is on, there will be a short sound of "beep" 4. The door cannot be opened because of system identification error. Just replace the system card.

3. When the lock is locked mechanically, the yellow light will light up. At this time, the door can't be opened, so you can open the door intelligently through the emergency card.

4. When the electronic anti-lock yellow light is on, there will be a short "beep" sound, and the door cannot be opened. Cancel the lock of the room card and you can open the door.

When the card is temporarily terminated, a yellow light will light up and there will be a short "beep" sound. Just cancel the termination of the reset card.