global sources IM1275 Electricity Metering Module User Manual

: June 4, 2024
: global sources

Table of Contents

global sources IM1275 Electricity Metering Module
IM1275 electricity metering Module
Overview
Application
Technical Parameter
Definition of Module Pin
Modbus Communication Protocol
Modbus Communication Protocol
DL/T 645-2007 electricity meter Communication Protocol
Module Pin Dimension
Wiring diagram
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global sources IM1275 Electricity Metering Module

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IM1275 electricity metering Module

The IM1275 single-phase AC electricity metering module is developed in order to adapt to various manufacturers to monitor the power consumption of their products; The software and hardware are widely used in the smart electricity meter. It is the smallest unit for electricity metering.
The accuracy is better than the national level 1 standard; The 45~65Hz AC
voltage, current, power, power factor, frequency, etc. can be measured. The communication protocol meets the standard of Modbus RTU communication protocol and DL/T645-2007 multi-function electricity meter communication. The automatic data collection and monitoring can be realized through the corresponding interface, single-chip computers and ARM;

Overview

A single module can collect single-phase AC parameters, including voltage, current, power, power factor, frequency, electric energy, temperature etc.
It adopts an industrial-grade dedicated electricity metering SOC chip with high measurement accuracy.
Standard 485 Communication with ESD protection Port, DL/T 645-2007 & MODBUS-RTU double protocol
It can be reversed to restart when it is full, and the power data is protected against power failure
It adopts a current transformer with Φ12.8mm, and the user can wear the wire with a nose, which is convenient.
When it is overloaded, the PF pin can output the corresponding pulse. This pin can also be used to verify the electricity metering accuracy of the metering module by the calibration station through pulse collection.
The product has obtained test report of the Metrology Institute

Application

The IM series AC and DC metering modules have been widely used in AC and DC charging piles, smart homes, dynamic environment monitoring FSU, smart security, lighting monitoring, smart parks, digital computer rooms, energy consumption management, battery monitoring etc.And it has been adopted and recognized by bench marking companies in different industries.It is important supporting modules for entering the Internet of Things era.

Notes

Please refer to the corresponding diagram for correct wiring according to product specifications and models. Be sure to disconnect all signal sources before wiring to avoid danger and damage to the
device. After checking that the wiring is correct, turn on the power to test.
After it is powered, the red LED indicator is always on, and during communication, the red LED indicator flashes synchronously during transmission.
It is set to the default configuration: address No. 1, baud rate 4800bps, data format “n,8,1”.It can be reset through the IM-S11 software.

Technical Parameter

Parameter

Active Accuracy| 1.0
Voltage Range| 1-380V ±0.5%F.S
Current Range| 20mA-50A ±0.5%F.S
Current Range Extension| Extensible Range,Open transformer (Customized)
Frequency| AC45~65Hz
Temperature| Chip Temperature
Min. Power Variable| 0.0001kW
Power factor| Measurable
Min. Electric energy variable| 0.001kWh
Co2| Co2 National standard formula calculation
Communication
Interface Type| 485 Communication (Built-in ESD protection)
Communication Protocol| Communication Protocol DL/T 645-2007 & MODBUS-RTU
Data Format| “n,8,1”(No check、data bits: 8 、stop bit :1) by default
Baud rate| 2400bps-19200bps， 4800bps by default
Data refresh interval| ≥250ms
Indicator| Power/Communication（Red）
Performance
Typical Power Consumption| ≤10mA
Power Supply| DC5.0V
Voltage Level| AC3000Vrms
Overload Capacity| 1.2 * Range
Working Environment
Working Temp.| -40～+80℃
---|---
Relative humidity| 5～95%，No dense（under 40℃）
Altitude| 0～3000 m
Working Environment| place which there is no explosion, corrosive gas and conductive dust, no significant vibration and impact
Dimension
Dimension| 60mmx 65mmx 40mm
Pin interval| 3.81mm
Transformer aperture| Φ12.8mm
Installation| Four corner fixing holes (3.5 aperture) for installation

Note 1 : Here is the relative error

Definition of Module Pin

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Pin	Function
V+	Power Supply positive
V-	Power Supply Negtive

Notes：

The Voltage is the power supply voltage for the module, which is 5V by default.

3.3V power supply is available when short- circuiting the RDJ1 and RDJ2 point. At this time, the reverse connection protection function is invalid. Ensure correct wiring or it will

directly burn out.

Modbus Communication Protocol

Modbus Protocol Electric Parameter Register List 1（4 bytes per address, high byte first）

Seria l No.

|

Items

| Register Addres

s

|

Lengt h

|

Read/ Write

|

Type and explanation

---|---|---|---|---|---

1

|

Voltage

|

0048

H

|

4

|

Read

| Hexadecimal Unsigned numbers Unit 0.0001W Actual Value= HEX2DEC(Register Value) x Unit
2| Current| 0049

H

9

|

Address and baud rates

|

0004

H

|

2

|

Read/ Write

| Hexadecimal Default Value 0105H： (Address 01H 8,N,1,4800)，Default Address 1 High Bytes represent Address，range

1~255 ，0 is Broadcast Address.Low Bytes: High 2 data format

(00: 10 bits data “8,N,1″) No check 1 end bit

(01: 11 bits data “8,E,1″) Even Parity Check 1 end bit

(10: 11 bits data “8,O,1″) Odd Parity Check 1 end bit

Low Bytes：Low 4 bits represent Baud rates (3 ： 1200bps 4 ： 2400bps)

| | | | | (5 ： 4800bps 6 ： 9600bps) (7：19200bps）
---|---|---|---|---|---

Modbus Protocol Electric Parameter Register List 2（2 bytes per address, high byte first）

Seri al No.| Defi niti on| Register address| Read

/Writ

e

| Type and explanation
---|---|---|---|---
1| Voltage| 0048H| Read| Unsigned number, Value=DATA/100, unit V
2| Current| 0049H| Read| Unsigned number, Value=DATA/100, unit A
3| Active Power| 004AH| Read| Unsigned number, Value=DATA, unit W

4

|

Active Total energy

| 004BH| Read|

Unsigned number, Value=DATA/3200, Unit kWh

6

|

Co2 Emission

| 004EH| Read| CO2 High emission

CO2 Low emission, Value=DATA/1000, Unit Kg

9

|

Address and braud rates

|

0004H

|

Read

/Writ e

| Hexadecimal Default Value 0105H： (Address 01H 8,N,1,4800)，Default Address 1 High Bytes represent Address，range

1~255 ，0 is Broadcast Address.Low Bytes: High 2 data format

(00: 10 bits data “8,N,1″) No check 1 end bit

| | | | (01: 11 bits data “8,E,1″) Even Parity Check 1 end bit (10: 11 bits data “8,O,1″) Odd Parity Check 1 end bit Low Bytes：Low 4 bits represent Baud rates

(3 ： 1200bps 4 ： 2400bps)

(5 ： 4800bps 6 ： 9600bps)

(7：19200bps）

Modbus Communication Protocol

This instrument provides Uart TTL communication interface, which adopts standard Modbus-RTU protocol. All kinds of data information can be transmitted on the communication line. Each network instrument can set its communication address. And the communication connection should use shielded twisted-pair wire with copper net, whose diameter is no less than 0.5mm2. When wiring, keep the communication line away from strong electric cables or other strong electric field Environment.
The Modbus protocol uses a master-slave response communication connection method on a communication line. First, the signal of the host computer is
First, the signal of the host computer is addressed to a terminal device (slave) with a unique Address, and then the response signal sent by the terminal device is transmitted to the host in the opposite direction, that is: All communication data streams are transmitted in the opposite two directions along a communication line (half-duplex Working mode). The Modbus protocol only allows communication between the host (PC, PLC, etc.) and terminal devices, and does not allow data exchange between independent terminal devices, so that each terminal device will not occupy the communication line when they are initialized, but is limited to response Inquiry signal to the machine. $global sources IM1275 Electricity Metering Module fig $3$$

Host device query: The query message frame includes the device address, function code, data information code, and check code. The address code indicates the slave device to be selected; the function code tells the selected slave device what function to be performed, for example, the function code 03 or 04 requires the slave device to Read registers and return their contents; the data segment contains the slave device’s requirements for any additional information of the execution function, the check code is used to check the correctness of a frame of information. The slave device provides a method to verify whether the message content is correct. It uses the CRC16 calibration rule.
Slave device response: If the slave device generates a normal response, the response message contains the address code, function code, data information code and CRC16 check code. The data information code includes the data collected from the device: such as register value or status. If an error occurs, we agree that the slave device will not respond.
We stipulate the communication data format used in this instrument: the bits of each byte (1 start bit, 8 data bits, Odd Parity Check or Even Parity Check or No check, 1 or 2 stop bits).
The structure of the data frame, that is, the message format:

Device

Address

| Function

Code

| Data

segment

| CRC16 check

code

---|---|---|---
1 byte| 1 byte| N byte| 2 byte (Low byte

first)

Device Address: Consists of one byte. The Address of each terminal device must be unique, and only the addressed terminal will respond to the corresponding query.
Function code: tells what function the addressed terminal performs. The following table lists the function codes supported by this series of instruments and their functions.
Function

Code

| Function
---|---
03H| Read one or more

register value

10H| Write one or more

register value

Contains the data required by the terminal to perform a specific function or the data collected when the terminal responds to a query. The content of these data may be numerical values, reference addresses, or set values.
Check code: CRC16 occupies two bytes and contains a 16-bit binary value. The CRC value is calculated by the transmitting device and then appended to the data frame. The receiving device recalculates the CRC value when receiving the data, and then compares it with the value in the received CRC field. If the two values are not equal, mistake will happens.
Process of generating a CRC16：

Preset a 16-bit register as 0FFFFH (all 1s), which is called CRC register.
XOR the 8 bits of the first byte in the data frame with the low byte in the CRC register, and store the result back to the CRC register.
Shift the CRC register one bit to the right, fill the highest bit with 0, and shift the lowest bit out and check.
If the lowest bit is 0: repeat the third step (the next shift); if the lowest bit is 1: XOR the CRC register with a preset fixed value (0A001H).
Repeat the third and fourth steps until 8 shifts. A complete eight bits have been processed in this way.
Repeat steps 2 to 5 to process the next eight bits until all bytes are processed.
The final value of the CRC register is the value of CRC16.

Modbus－ RTU Communication Protocol cases
Function code 0x03 ：Read multi-port register
Eg：The host device needs to read Address as 01, and start sending data from the 2 slave registers with Address as 0048H: 0103 00 4800 02CRC
Address Function code Start Address Length CRC code
Slave device responds： 010308HH HH HH HH CRC
Address Function code Return bytes No.
Register Data 1 Register Data 2 CRC code Function Code 0*10 :

Write multi port register

E.g：The host device need save 0000,0000 to the slave Register whose Address is 000C,000D (the address code of the slave is 0x01)

Notes: When setting parameters, do not write illegal data (that is, the data value that exceeds the limit of the data range);

Communication Messages Case

Read Data Register (Function code 03H) ：Read 8 Register value which starts with 48H， Host device Read
Data frame： 01 03 00 48 00 08 C4

Addres s| Co mm and| Start Address (High byte first)| Register number (High byte first)| Check code (Low byte first)
---|---|---|---|---
01H| 03

H

| 00H,48H| 00H,08H| C4H,1AH

nt responds Data frame： 01 03 20 00 21 8D D8 00 01 38 75 01 0C 63 08 00 00 00 5A 00 00 03 E8 00 00 00 59 00 00 0C CB 00 00 13 88 1B C2
It is： Address 01Voltage 219.9000VCurrent
7.9989APower 1758.9000W
Electric Energy 0.0090kWhPower
Factor 1.000Co2 0.0089Kg
Frequency 50.00Hz

E.g：Voltage actual value= HEX2DEC(00 21 8D D8) Hexadecimal to Decimal x 0.0001V Unit = 219.9000V

Addre ss| Co mm

and

| Data length| Data segment (4 bytes/32 bytes),hexadecimal Check code| Check code
---|---|---|---|---
01H| 03| 20H| 00 21 8D D8 00 01 38 75 01 0C 63 08 00 00 00| 1BH,C2H
| H| | 5A|
| | | 00 00 03 E8 00 00 00 59 00 00 0C CB 00 00 13 88|

Write Data Register (Function code 10H): Clear
Host device Write Data frame：01 10 00 4B 00 02 04 00 00 00 00 B6 2C

Add ress| Com man

d

| start address| Register| Bytes number| Data segment| Check code
---|---|---|---|---|---|---
01| 10H| 00H,4BH| 00H,02H| 04H| 01H 10H 00H,4BH| B6H,2CH
H| | | | | 00H,02H 2BH,F0H|

Instrument responds Data frame：01 10 00 4B 00 02 2B F0

Addres s	Comm and	start address	Register	Check code
01H	10H	00H,4BH	00H,02H	2BH,F0H

DL/T 645-2007 electricity meter Communication Protocol

The DL/T645 protocol is an industry communication protocol for meter communication. If you are not familiar with it, it is not recommended

645 protocol electric parameter Register List

Seri al

No.

| Definition| Register address| Len gth| Read/Wr ite| Type and explanation
---|---|---|---|---|---
1| Voltage| 02010100| 2| Read| XXX.X unit 0.1V
2| Current| 02020100| 3| Read| XXX.XXX unit 0.001A
3| Active Power| 02030000| 3| Read| XX.XXXX unit 0.0001kW
4| Active Total energy| 00000000| 4| Read/Write 0| XXXXXX.XX unit 0.01KWh
5| Entensive total energy| 80800001| 4| Read/Write 0| Hexadecimal Unsigned numbers Unit 0.0001W
6| Power factor| 02060000| 2| Read| X.XXX unit 0.001
7| Temperature| 02800007| 2| Read| XXX.X unit 0.1℃
8| Frequency| 02800002| 2| Read| XX.XX unit 0.01Hz
9| Address| 04000401| 6| Read/Write| NNNNNNNNNNNN default 111111111111

10

| ****

Baud rate

| ****

04000703

| ****

1

| ****

Read/Write

| 16 unsigned numbers (04： 1200bps 08： 2400bps) (10：4800bps

20：

9600bps)

| | | | | (40：19200bps）
---|---|---|---|---|---

Module Pin Dimension

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Wiring diagram

IM1275 Standard wiring diagram

$global sources IM1275 Electricity Metering Module fig $5$$

IM1275 short-circuit point indication diagram $global sources IM1275 Electricity Metering Module fig $6$$

Notes

This product contains quartz crystal, so ultrasonic cleaning is strictly prohibited.
The surface of this product is sprayed with three-proof paint for protection, and it is strictly forbidden to clean the surface of the product

Precautions

Please refer to the diagram for correct wiring according to the product specifications and models. Be sure to disconnect all signal sources and power before wiring to avoid danger and damage to the equipment. After checking that the wiring is correct, turn on the power to test.
The voltage circuit or the secondary circuit of the PT cannot be short-circuited.
When there is a Current on the primary side of the CT, it is strictly forbidden to open the secondary circuit of the CT; it is strictly forbidden to connect live wires or unplug the terminals.
When the product is used in an environment with strong electromagnetic interference, please pay attention to the shielding of the input and output signal lines.
For centralized installation, the Min. installation interval should not be less than 10mm.
There is no lightning protection circuit in this series of products. When the input and output feeders of the module are exposed to a harsh outdoor environment, lightning protection is a must.