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ErrorLib — Industrial Fault Code Library

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0400 RSL parity

RSL Parity Error

Otis · GAA21750AK3 Service Tool

What does 0400 RSL parity mean?

This event log entry indicates a parity error occurred on the Remote Serial Link (RSL) at address '0400'. This error signifies data corruption during transmission over the RSL, which can lead to unreliable communication with remote stations and potential system blocking for the LCB_II.

Common Causes

  • Electrical noise or interference on the RSL communication lines.
  • Damaged or degraded RSL cabling.
  • Incorrect RSL termination resistor settings.
  • Faulty RSL transceiver module at address '0400' or on the main LCB_II board.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the RSL communication cable for physical damage, proper shielding, and secure connections.

  2. 2

    Verify the RSL termination resistors are correctly installed and set at both ends of the communication bus.

  3. 3

    Check for sources of electromagnetic interference (EMI) near the RSL wiring.

  4. 4

    Perform a bus resistance measurement if applicable, expecting specific resistance values.

  5. 5

    Replace the RSL module at address '0400' if the error persists after verifying wiring and environment.

Browse all codes in this manual (15)
Verified technical data. Last updated: April 2026

Related Faults

-Selftest Not Successfully Finished000RSL Parity Error Count>1LS + 2LS !Both 1LS and 2LS Operated
Source: Otis GAA21750AK3 Service Tool
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