SERIAL DATA ERROR(EXT)

What does 385 mean?

This alarm on Fanuc Series 0i-D/0i Mate-D indicates a communication interruption with a separate (external) detector. Common causes are cable disconnection, detector failure, or external noise affecting the serial data transmission.

• Physical disconnection or damage to the external detector's communication cable.
• Electrical noise interfering with the serial data communication to/from the detector.
• Internal failure of the external detector preventing serial data transmission.

Click steps to track your progress.

1. 1

   Inspect the external detector cable for physical damage, such as cuts, abrasions, or crushed sections.

2. 2

   Verify all connections of the external detector cable at both the detector and the SDU are secure and properly seated.

3. 3

   Check for and mitigate sources of electrical noise (e.g., from power contactors, switching devices) in the vicinity of the detector and its cabling.

4. 4

   Perform a continuity test on the external detector cable to ensure no broken wires or disconnections.

5. 5

   If cable integrity and noise issues are ruled out, replace the external detector unit.