Huawei EMMA A02 – Modbus Registermap & Node‑RED Function Nodes

This Node‑RED flow provides a complete Modbus registermap and a set of function nodes for reading, decoding, and normalizing Modbus registers from the Huawei EMMA A02 (SmartHEMS) energy management module.
🔍 Overview

This flow includes:
A structured registermap for the Huawei EMMA A02
Function nodes to decode and normalize Modbus register values
A modular architecture separating register definitions, Modbus read operations and data decoding
📘 Documentation Basis

The registermap and decoding logic are based on the official Huawei SmartHEMS documentation:
SmartHEMS – MODBUS Interface Definitions
Version: V100R025C00SPC100
Issue: V100R025C00SPC100
Date: 2025‑06‑18
Documentation source: https://www.photovoltaikforum.com/core/file-download/514695/
The registermap was generated with Microsoft Copilot, following section “3.1 Register Definitions for the EMMA”.
🧩 What This Flow Provides

✔️ Complete Registermap

A comprehensive JSON‑based registermap that provides all required fields to generate the payload for the Modbus Flex Getter and to pass decoding metadata to subsequent function nodes.
✔️ Decoding Function Nodes

Reusable function nodes that:
Convert raw Modbus values into engineering units
Handle signed/unsigned values
Normalize naming and output structure
🛠️ Requirements

Node‑RED (tested on v4.12)
node-red-contrib-modbus
Huawei EMMA A02 with Modbus enabled
Network access to the EMMA’s Modbus TCP interface (or RS485 if adapted)
🚀 Getting Started

Import the flow into Node‑RED
Configure the Modbus connection (IP, port, unit ID)
Deploy the flow
Start receiving structured EMMA A02 data
📝 Notes

The registermap is based on the official documentation and may evolve with future firmware updates.
Contributions, corrections, and extensions are welcome.
🧩 Flow

Note: some third-party nodes may appear with blank styling, and not as they appear in the Node-RED Editor.
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Flow Info

Created 3 months, 1 week ago
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emmArts
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Core

debug (x2)
function (x3)
inject (x38)
link in (x1)
link out (x6)
Other

global-config (x1)
modbus-client (x1)
modbus-flex-getter (x1)
tab (x1)