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IIoT Modbus Data Concentrator for collecting and storing data from Modbus RTU slaves.  Up to 8 Modbus TCP connections can poll the data simultaneously.  Data can be stored on the microSD card and retrieved with HTTP.


IIoT Modbus Data Concentrator for collecting and storing data from Modbus RTU slaves. Up to 8 Modbus TCP connections can poll the data simultaneously. Data can be stored on the microSD card and retrieved with HTTP.

  Price:  $759.00  

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  • Support Modbus master/slave
  • Supports up to 8 simultaneous Modbus TCP connections
  • Up to 250 sets of Modbus RTU commands and built-in 9600 Modbus data registers
  • Support CSV (Comma-Separated Values) file configuration, easy to use and maintain
  • Built-in microSD memory card for storing Modbus data records
  • Each data can contain 120 parameters
  • The data record can support the ratio conversion function, which converts the original Modbus data into actual engineering units
  • Isolated RS-485 with 2500 VDC isolation voltage protection



The Modbus Data Concentrator is the ideal product for IIoT system integrators. The MDCL-705i is used to collect and store data from multiple Modbus slave devices over the serial communication interface and make the data available to back-end management system via Ethernet communication. In this way, conventional devices can be attached to a modern control system and through the Modbus TCP protocol easily communicates with most SCADA / HMI systems and PLCs. Thus the management system can poll the MDCL-705i for the data from several Modbus devices at once; making the process much more efficient.

The MDCL-705i can help you build a cost-effective data acquisition solution for reading real-time data from meters, sensors and more. The ability to integrate with SCADA systems and other industrial devices, and the reliable real-time data collection in combination with the data logger makes MDCL-705i one of the most cost-effective products of IIoT.

Modbus Data Concentrator
The MDCL-705i collects data using the Modbus RTU protocol to poll the data out of the device. For each data you want to retrieve, just define the Modbus RTU commands in a CSV file and import it via the web interface. The MDCL-705i can perform up to 250 polling definitions. Its internal shared memory has four tables (Coils, Discrete Input, Input Registers and Holding Registers) to store the polled data. Each table can store up to 9600 registers. It allows up to 8 simultaneous Modbus TCP connections to get the polled data at one time.

Stand-alone data logging capability
The MDCL-705i uses a periodic method to record user-specified Modbus register data. Each data can contain up to 120 parameters. The data records will be stored in the built-in microSD memory card in CSV file format and can be downloaded to the computer through the built-in web interface. Data viewing and data analysis can be performed using Microsoft Excel software or a plain text editor.




Data Logger
Data Type
Boolean, 16-bit Integer, 32-bit Integer and 32-bit Floating
Max. Recording Period per File
1 hr, 2 hr, 6 hr, 12 hr, 24 hr
File Manager Interface
Built-in web server
Storage Media
microSD Card (Up to 32 GB)
File Format CSV

Time Interval

5 sec, 10 sec, 30 sec, 1 min, 5 min, 10 min, 15 min, 30 min, 1 hr, 6 hr
Max. Records 120 parameters per record
5-Digit 7 Segment LED Display (display system information)
LED Indicators
1 x System, to (display heartbeat)
COM Ports
2 x 2-wire RS-485 (non-isolated)
3 x 2-wire RS-485 (2.5 kV isolation protection)
Baud Rate
1200, 2400, 4800, 9600, 14400, 19200, 38400, 57600, 115200 bps
Data Format
N81, E81, O81, N82, E82, O82
Protocol Modbus RTU Master/Modbus RTU Slave
Polling Definition 250 definitions for all RS-485 ports
Shared Memory 9600 registers for each of AI, AO, DI and DO data
Max. Connection 32 slaves for each RS-485 port
Ports 10/100 Base-TX
Protocol Modbus/TCP slave, HTTP
Socket Connections 8 Modbus/TCP
Input Range +10 ~ +48 VDC
Consumption 2 W
Casing Metal
Dimensions (mm) 97 x 120 x 42 (W x L x H)
Installation DIN-Rail or Wall Mounting
Operating Temperature -25 ~ +75 °C
Storage Temperature -30 ~ +80 °C
Humidity 10 ~ 90 % RH, Non-condensing

References and Support

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