During the use of CFS, if communication anomalies occur, the red lights on all slots will flash. Possible reasons include:
The connection cable between CFS and the printer is loose or disconnected.
Internal hardware failure of CFS.
Check the connection cable: Confirm whether the communication cable between CFS and the printer is correctly connected, and check for any looseness or disconnection.
Check and confirm if the 485 connection cable between CFS and the machine is properly connected.
Restart the printer and CFS, and observe if normal communication is restored.