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DC test products
2 MH-MPJK1 Photovoltaic DC Combiner Box Intelligent Monitoring Device Series
1 MH-PVJK2 photovoltaic DC combiner box intelligent monitoring device series
2 MH-DDC2 Multi-channel Intelligent Current Sensor Series
2 MH-SC1 handheld terminal
2

Leakage current sensor series

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solution
1 Data room power management system solution
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contact details
Address: International Enterprise, No. 188, Environmental Protection Middle Road, Yuhua District, Changsha City
Center Building 1, Block A 302
Phone: 0731-82739258
Fax: 0731-82739248
Email: cs_mhkj@163.com
HM-DDC2 Multi-channel Intelligent Current Sensor

I. Product Performance Introduction

MH-DDC2 multi-channel intelligent current sensor is a high-precision, low-power, fully intelligent DC current sensor newly developed by our company. It is widely used in photovoltaic combiner boxes, DC column head cabinets, DC data room monitoring and other fields. Has the following characteristics:
1. Small size and easy installation
2.Integrated package, high reliability
3, 8 \ 12 \ 16 DC current measurement
4. Comes with RS-485 data interface and supports MODBUS-RTU protocol
5, 5V power supply, 20mA maximum working current, extremely low power consumption
6.With over voltage and reverse connection protection of working power

Model description

 3

Third, the external dimensions and terminal definition diagram

Dimensions of 16 channels: 340 × 38 × 15

Dimensions of 12-way device: 268 × 38 × 15

Dimensions of 8-way device: 196 × 38 × 15

Terminal definition table

Terminal name

Terminal group function

Terminal description

V +

Smart current sensor connection

5V working power supply positive terminal

V-

5V working power negative terminal

A / TX

RS485 A line terminal

B / RX

RS485 B line terminal

Note: The two groups of terminals on the left and right are through, either side can be connected.

Fourth, technical parameters

Working power input

DC 4.5-5.5V current <20mA

Measuring rated current

DC 15A

Measuring current range

DC -5A ~ + 15A

Current measurement accuracy

0.5 grade

Data output interface

RS-485 9600bps 8-bit without parity

Data communication protocol

MODBUS RTU

Normal working temperature

-30 ℃ ~ 70 ℃

Extreme storage temperature

-40 ℃ ~ 85 ℃

Safety isolation voltage

5000VAC between the tested photovoltaic wire and the case ground and terminal

Five, MODBUS-RTU communication protocol description
1. The serial communication of this product fully complies with the standard MODBUS-RTU protocol. The data format, hardware timing and data frame structure are fully compliant with the MODBUS protocol. As long as the device address is set using our configuration software, fast and error-free communication can be performed. .
2. This product supports the functional field codes in the MODBUS protocol:

function code

meaning

Features

03H

Read holding register

Read measurement data, read all setting parameters

10H

Write register

Set device address

3.This product supports reading up to 20 registers at a time
4. Detailed explanation of function code
Function code 03H: read holding register, read current data
Data definition: See register data comparison table
Example 1: Read 1-16 currents:
Command: 01 03 00 00 00 10 44 06
Address function code start address register number CRC check
Response: 01 03 20 32 byte CRC
Address Function Code Bytes 16 Channels Current Data CRC Check
Function code 10H: write register
Data definition: See register data comparison table.
Example 2: Set the device address
Command: 01 10 0100 0001 02 0002 CRC
Address Function Code Start Address Register Number Bytes New Address CRC Check
Response: 01 10 0100 0001 CRC
Address function code start address register number CRC check

Six, precautions for use
1. Make sure that the working power supply is within the specified range.
2. Please keep the power supply ripple less than 100mVp-p.
3. The order of the terminal blocks on the left and right is opposite. Please pay attention to the labeling of the terminal blocks when connecting.

Seven, instructions

MH-DDC2 Instruction Manual.pdf
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