Serial port overflow

What does 2821 mean?

The serial port buffer has overflowed, indicating that data is being received faster than it can be processed. This can lead to loss of communication or corrupted data.

• Data being transmitted to the serial port (e.g., RS-485, RS-232) at a baud rate higher than the drive's processing capability.
• Excessive, unsolicited communication messages from a connected master device.
• Software bug in the drive's serial communication handler failing to process incoming data quickly enough.
• High processor load within the drive diverting resources from serial communication tasks.
• Intermittent noise on the serial lines corrupting data and causing re-transmission attempts that fill the buffer.

Click steps to track your progress.

1. 1

   Reduce the baud rate of the connected master device to match P8-10 (Baud rate) or a lower, more stable rate.

2. 2

   Verify Parameter P8-11 (Protocol) is correctly configured for the connected device (e.g., FC Protocol, Modbus RTU).

3. 3

   Check the integrity of the serial communication cable for proper shielding and verify termination resistors are correctly installed.

4. 4

   Monitor the communication traffic using a protocol analyzer to identify if an external device is sending excessive data.

5. 5

   Update the drive firmware to the latest available version to address potential communication handler bugs.