Use this when implementing or refactoring HA custom components that communicate with Modbus devices.
Quick start
Pick connection mode (tcp, rtuovertcp, serial); set timeout and message spacing.
Always pass the correct unit id (device_id/slave) on every read/write.
Batch contiguous reads, lock IO, and tier polling; cache last good data for availability.
Encode multi-register writes (float32/uint32) and avoid immediate post-write refresh.
Use translation_key + entity.sensor names and stable unique/device ids.
References
references/connection-modes.md
references/read-write-patterns.md
references/resilience-and-pacing.md
references/translations-and-ids.md
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1---2name: plebann-eastron-sdm-ha-integration-ha-modbus-integration3description: HA Modbus Integration4---56# HA Modbus Integration78Use this when implementing or refactoring HA custom components that communicate with Modbus devices.910## Quick start11- Pick connection mode (tcp, rtuovertcp, serial); set timeout and message spacing.12- Always pass the correct unit id (device_id/slave) on every read/write.13- Batch contiguous reads, lock IO, and tier polling; cache last good data for availability.14- Encode multi-register writes (float32/uint32) and avoid immediate post-write refresh.15- Use translation_key + entity.sensor names and stable unique/device ids.1617## References18- [references/connection-modes.md](references/connection-modes.md)19- [references/read-write-patterns.md](references/read-write-patterns.md)20- [references/resilience-and-pacing.md](references/resilience-and-pacing.md)21- [references/translations-and-ids.md](references/translations-and-ids.md)2223---24> Converted and distributed by [TomeVault](https://tomevault.io/claim/plebann) — claim your Tome and manage your conversions.25<!-- tomevault:4.0:skill_md:2026-04-13 -->
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HA Modbus Integration It is listed under Integrations & APIs on SkillMD.
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