DAQ-IOT Modbus RTU RS485 Split Core Current Transformer CT AC Analog Signal Coil Sensor DC 12V 5A DC Current Transformer Power On or Off Status Monitoring

DAQ-IOT Modbus RTU RS485 Split Core Current Transformer CT AC Analog Signal Coil Sensor DC 12V 5A DC Current Transformer Power On or Off Status Monitoring

1            Product Overview

DAQ-GP-CT485 split core current transformer is a kind of current sensor (transformer) which can convert AC analog signal into RS485 digital signal launched by Shanghai Data Acquisition IOT Technology Co., LTD. The product has built-in 32-bit ARM series MCU and high-precision metering chip, and is a multi-point calibrated current conversion module. It has the characteristics of high precision and fast response. DAQ-GP-CT485 can directly interact with common data acquisition gateways, DTU, programmable controller PLC, and host computer.

This product is widely used in AC motor, lighting equipment, air compressor, heating ventilation and air conditioning equipment, building self-control system, equipment OEE open rate, industrial Internet, rural power transformation projects and other scenarios of current monitoring and acquisition scenarios.

2           Service Concept

Our company solemnly promise you:

You buy more than just products, but also meticulous and thoughtful technical support.

We provide free remote guidance, remote configuration and commissioning services, and send data to the server specified by the customer.

Free IOT solution consulting services!

3           Product Characteristic Parameters

Line Sequence Definition

Red:+12V   Black：GND  Yellow：485A  White：485B

Length of Line：Default 1 meter

Acquisition Characteristic

l  Current detection range:  AC 0.2A-100A，Other large range transformers can be customized

       Electrical Characteristic

l  Power supply mode：5~24V DC

l  Operating power consumption：0.5W

l  Operating frequency：50-60Hz

       Communication Characteristic

l  Transmission mode：RS485

l  Communication protocol:  Modbus RTU

Structural Characteristic

l  Material：ABS plastic (housing)

l  Installation method：Buckle mounting

Working Environment

l  Temperature: -20°C～70°C

Storage Environment

l  Temperature: -20°C～80°C

4           The Core Advantages of the Product

Ø  High precision measuring chip, high measurement accuracy

Ø  Open type design, easy to install

Ø  Easy installation and fast deployment, helping IOT projects land quickly

5           Description of the Modbus Communication Protocol

5.1     Serial Port Communication Parameters

Baud rate：9600      Data bit：8      Verify：NONE      Stop bit：1

5.2     Function Code Definition

The upper computer uses 03 function code to read data or receive alarm data.

The host computer controls the lower machine equipment (transformer) using 06 function code.

5.3     Register Point Table Definition

Register table：

Serial number	Register address	Instructions	Read/Write	Data type
1	0x01	Device address (default 1)	Read/Write	16-bit
2	0x02	Sensor data is 16 bits higher	Read	16-bit
3	0x03	Sensor data is 16 bits lower	Read	16-bit
4	0x04	Baud rate	Read/Write	16-bit
5	0x05	Reserve		16-bit
6	0x06	Reserve		16-bit
7	0x07	Reserve		16-bit

 

5.4     Communication Packet Examples

Give an example：

Host reads the sensor value：

1	2	3	4	5	6	7	8
Device address	Function code	The register address is 8 bits higher	The register address is 8 bits lower	The number of read registers is 8 bits higher	The number of read registers is 8 bits lower	The CRC is 8 bits higher	The CRC is 8 bits lower
0x01	0x03	0x00	0x01	0x00	0x02	0x95	0xCB

Return data from slave：

1	2	3	4	5	6	7	8	9
Device address	Function code	Number of bytes	Register value [31:24]	Register value [23:16]	Register value [15:8]	Register value [7:0]	The CRC is 8 bits higher	The CRC is 8 bits lower
0x01	0x03	0x04	0x00	0x00	0x27	0x10	0xE0	0x0F

The register value is 0x00002710, and the decimal notation is 10000. Assuming that the AC transformer ranges from 0 to 100A, the current is 100A.

Changing a device address：（0x01 is changed to 0x02）

Host sending：

1	2	3	4	5	6	7	8
Device address	Function code	The register address is 8 bits higher	The register address is 8 bits lower	The register value is 8 bits higher	The register value is 8 bits higher	The CRC is 8 bits higher	The CRC is 8 bits lower
0x01	0x06	0x00	0x00	0x00	0x02	0x08	0x0B

Return data from slave：

The new address takes effect only after the current device address is returned from the slave.

1	2	3	4	5	6	7	8
Device address	Function code	The register address is 8 bits higher	The register address is 8 bits lower	The register value is 8 bits higher	The register value is 8 bits higher	The CRC is 8 bits higher	The CRC is 8 bits lower
0x01	0x06	0x00	0x00	0x00	0x01	0x48	0x0A

 

Modified baud rate：(9600 is changed to 1200)

Host sending：

1	2	3	4	5	6	7	8
Device address	Function code	The register address is 8 bits higher	The register address is 8 bits lower	The register value is 8 bits higher	The register value is 8 bits higher	The CRC is 8 bits higher	The CRC is 8 bits lower
0x01	0x06	0x00	0x04	0x00	0x02	0x49	0xCA

Return data from slave：

1	2	3	4	5	6	7	8
Device address	Function code	The register address is 8 bits higher	The register address is 8 bits lower	The register value is 8 bits higher	The register value is 8 bits higher	The CRC is 8 bits higher	The CRC is 8 bits lower
0x01	0x06	0x00	0x04	0x00	0x02	0x49	0xCA

（Note: The baud rate takes effect only after the device is powered on again. Change back to 9600 host and send 01 06 00 04 00 05 08 08）

Baud rate register (0x04) Value description：

Register address	Register value	Attributes (Baud rate)
0x04	0x00	300
	0x01	600
	0x02	1200
	0x03	2400
	0x04	4800
	0x05(Factory default)	9600
	0x06	19200
	0x07	38400
	0x08	43000
	0x09	56000
	0x0a	57600
	0x0b	115200

If the baud rate is set outside the range, the slave will return the current register value without changing the baud rate.

6          Application Cases

Collection of current data of production equipment in textile factory

In this case, 4G wireless open-type AC sensor is used to collect current data, and the data is displayed on the cloud platform. The data can be accessed and viewed through websites, apps, WeChat mini programs, etc.

 

7           Contact Us

Website: www.daq-iot.com

Tel: +8619936624847

Email: shengrunan@daq-iot.com

 WhatsApp：+8619936624847