Modbus Poll Bytes Missing Error Fixed ((hot)) Jun 2026

Are you seeing this error on a , or is it happening over a long-distance serial run ?

If you are polling every 20 ms, some slaves cannot keep up.

Ensure RS-485/RS-232 wiring is secure and correctly mapped (A to A, B to B). Termination:

Poll a different register address or a different slave ID. If bytes are missing only for a specific register, the issue may be a slave firmware bug.

Are you seeing this error on a , or is it happening over a long-distance serial run ?

If you are polling every 20 ms, some slaves cannot keep up.

Ensure RS-485/RS-232 wiring is secure and correctly mapped (A to A, B to B). Termination:

Poll a different register address or a different slave ID. If bytes are missing only for a specific register, the issue may be a slave firmware bug.

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