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ErrorLib — Industrial Fault Code Library

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SRVO-092

Line Tracking Pulsecoder Communication Start/Stop Bit Error

Fanuc · R-30iB Mate + Mate Plus Robot

What does SRVO-092 mean?

Communication between the Pulsecoder and the line tracking board is abnormal, specifically indicating a Start/Stop Bit Error (STBERR). This signifies a problem with the framing of serial data packets.

Common Causes

  • Incorrect start or stop bit signaling from the line tracking pulsecoder.
  • Line tracking pulsecoder unit not adhering to communication protocol timing.
  • Signal integrity issues affecting start/stop bit detection.
  • Faulty line tracking pulsecoder generating invalid serial framing.
  • Servo controller expecting a different communication frame structure.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the connection cable at each end (the line tracking board and the Pulsecoder).

  2. 2

    Check whether the shielding of the connection cable is securely connected to the grounding plate.

  3. 3

    Replace the Pulsecoder.

  4. 4

    Replace the line tracking cable.

  5. 5

    Replace the line tracking board.

Browse all codes in this manual (53)
Verified technical data. Last updated: April 2026

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Source: Fanuc R-30iB Mate + Mate Plus Robot
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