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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

7

RS transmission buffer overflow

Fronius · Solar Energy

What does 7 mean?

This error occurs when the transmit buffer for the RS communication interface (likely RS-232/485) receives more data than it can process or hold. This can lead to data loss during transmission and disruption of serial communication.

Common Causes

  • High data transmission rate exceeding buffer capacity
  • Slow processing of data from the transmit buffer
  • Incorrect communication settings (e.g., baud rate mismatch)

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify RS communication parameters (baud rate, data bits, parity, stop bits) on the Fronius device and the connected external system are identical.

  2. 2

    Inspect the RS communication cabling for damage, proper termination, and secure connections between the Fronius device and the external system.

  3. 3

    Check the external device's configuration and data transmission rate to ensure it is not overwhelming the Fronius communication buffer.

  4. 4

    Cycle power to both the Fronius device and the connected external system to reset communication interfaces.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

1Hardware fault102AC voltage too high103AC voltage too low
Source: Fronius Solar Energy
Open Manual (Page 134)Search more codes in this manual