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[OFFICIAL POST] EEDIY Team (official)
The Modbus spec numbers items from 1, but the message on the wire counts from 0. Many manuals write holding registers as “4xxxx” (40001 = register 1, sent as 0). That is a vendor habit, not part of the spec.
Fix: if your values look shifted by one, try the address minus 1.
Sources:
- Modbus Application Protocol Specification (PDF): https://www.modbus.org/file/secure/modbusprotocolspecification.pdf
EEDIY Team (official)
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