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Daitsu AOWD-MB LOGIK-18K2 Installation, Service And User Manual

Daitsu AOWD-MB LOGIK-18K2 Installation, Service And User Manual (30 pages)

Modbus Protocol (V2.2) for the Heat Pump Water Heater

Brand: Daitsu | Category: Heat Pump | Size: 4.1 MB

Table of Contents

Table of Contents
2
1 Terms and Definitions

3
- Preface
  3
2 Brief Introduction to the BMS System

4
3 Network Topology

4
- General
  4
- Topological Structure
  5
  - Topological Strcutre (＜255)
    5
  - Topological Strucuture (＞255)
    5
4 MODBUS Protocol Format

5
- General
  5
- Protocol Interface
  5
- Hardware Interface
  5
- Universal Communication Frame Format of Modbus under RTU Mode
  8
- Modbus Standard Protocol Format
  8
  - Coil (Bit)
    8
  - Register (Word, 16 Bit)
    9
  - Read Multiple Coils
    9
  - Write Multiple Coils
    9
  - Read Multiple Registers
    10
  - Write Multiple Registers (Word)
    10
  - Alarm Response
    10
5 Communication Protocol for the Versati Heat Pump Water Heater

11
- General
  11
- Precautions before Designing the BMS Interface
  11
- Valid Data for Modbus Communication
  12
- Precautions Befor the Use
  29
  - CRC Calculation Method
    29
  - How to Calculate the CRC
    29
  - CRC Example
    29

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