1. Overview
The Acrel DTSD1352 three-phase multi-function energy meter supports Modbus RTU communication. Based on the official Acrel technical manual, this article describes the Modbus register address mapping of the DTSD1352 in detail.
2. Modbus Communication Parameters
| Parameter | Default Value | Description |
|---|
| Baud rate | 9600 bps | Configurable from 1200 to 115200 |
| Data bits | 8 bits | - |
| Parity | Even parity | Can be set to no parity |
| Stop bits | 1 bit | - |
| Slave address | 1 | Configurable from 1 to 247 |
3. DTSD1352 Modbus Register Mapping Table
3.1 Electrical Parameter Measurement Registers
| Modbus Address | Parameter Name | Unit | Description |
|---|
| 0x0000 | Phase A voltage | V | 32-bit floating point |
| 0x0002 | Phase B voltage | V | 32-bit floating point |
| 0x0004 | Phase C voltage | V | 32-bit floating point |
| 0x0006 | Phase A current | A | 32-bit floating point |
| 0x0008 | Phase B current | A | 32-bit floating point |
| 0x000A | Phase C current | A | 32-bit floating point |
| 0x000C | Active power | kW | 32-bit floating point |
| 0x000E | Reactive power | kvar | 32-bit floating point |
| 0x0010 | Power factor | - | 32-bit floating point |
| 0x0012 | Frequency | Hz | 32-bit floating point |
3.2 Energy Registers
| Modbus Address | Parameter Name | Unit |
|---|
| 0x0100 | Forward active energy | kWh |
| 0x0102 | Reverse active energy | kWh |
| 0x0104 | Forward reactive energy | kvarh |
| 0x0106 | Reverse reactive energy | kvarh |
4. Data Format Description
- All measured values are 32-bit floating-point numbers (IEEE 754)
- Each data item occupies 2 registers (4 bytes)
- Byte order: Big-Endian
- Word order: high word first, low word second
5. FAQ and Troubleshooting
- Check whether the communication parameters match those of the meter
- Confirm that the slave address is set correctly
- Pay attention to the byte order and word order of the 32-bit floating-point numbers
- The units of voltage and current are V and A, not mV and mA
6. Summary
Core registers for Acrel DTSD1352 meter Modbus communication:
- 0x0000 → Phase A voltage
- 0x0006 → Phase A current
- 0x000C → Active power
- 0x0010 → Power factor
- 0x0100 → Forward active energy
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