IoT (Internet of Things)


Dual-Sim Cellular IoT RTU (8DIN, 6AIN/PT100, 4Relay, 1TH, USB, 2 RS485, 320 Extend I/O tags)

The Dual Simcard Cellular IoT Modbus RTU is design for working in the harsh industrial application environment, converting Modbus TCP/RTU to SMS and cloud platform. widely used in a variety of industrial automation, security monitoring system, automatically measurement and control system, BTS monitoring, remote data acquisition, telemetrically systems, automatically control system. It can be used as a remote switch, remote I/O, remote smart PLC, timer switches. Supports SMS,GPRS,3G, 4G Lte Cellular Networks.Compatible Modbus TCP and MQTT IoT Protocols and can intergrate to the KPIIOT IoT Cloud Platform and OPC, SCADA and MES systems.

The Cellular IoT RTU is an industrial class, high reliability, high stability, and programmable Remote Terminal Unit (RTU).  It embedded 32-Bit High Performance Microprocessor MCU, inbuilt industrial Cellular module. It provides 8 digital inputs, 6 analog(ultra high 24 bit resolution) or PT100 Resistance Temperature Detector (RTD) inputs, 4 relay outputs, 1 ambient sensor input for monitoring onsite temperature and humidity, 1 Ethernet RJ45 port for connect internet WAN or LAN, supports dual nano sim card, with 2 RS485 serial port, supports 224 mapping registers via Modbus RTU protocol. It can monitoring and operates the I/O ports by SMS, APP, Web Server, internet, timers and programmed inter-lock events automatically.

The Cellular IoT Modbus RTU can be used to remote PLC via RS485 or Ethernet port, converting Modbus RTU/Modbus TCP to SMS or cloud platform over ethernet or cellular networks.


  1. Can be operated from anywhere, no distance limitation;
  2. Quad band 850/900/1800/1900Mhz GSM GPRS Module inside.
  3. 3G/4G/NB-IoT Modules are optional;
  4. Modular design, can easily upgrade the cellular module if network upgrade;
  5. Embedded ARM® Cortex™-M4 32 Bit RISC Core, 168 MHz inside, RTOS system, reliable performance with in-built watchdog;
  6. Wide range power supply 9~36VDC with over voltage and phase-reversal protection;
  7. 8 digital inputs, compatibles dry and wet contact, one of it can be used as pulse counter;
  8. 6 analog inputs, 24bit resolution, compatibles 0/4~20mA, 0~5V, can change to PT100 Resistance Temperature Detectors;
  9. 4 relay output (5A/30VDC, 5A/250VAC), compatibles pulse outputs;
  10. 1 ambient sensor input for monitoring onsite temperature and humidity;
  11. Inbuilt inter-lock logic programmer and powerful timer program function;
  12. Resend the data while communication failure and alert to users by SMS;
  13. Inbuilt TCP/IP protocol stack, supports cloud, APP and web server applications.
  14. Supports Modbus TCP protocol, can integrate to SCADA,HMI,DSC directly.
  15. Supports RJ45 Ethernet port for connect internet, WAN or LAN;
  16. 2 RS485 port supports Modbus RTU Master and Slave,  can be used to extend I/O ports or meters;
  17. Supports SMS Alert when I/O triggered or recovery, and external power lost or recovery;
  18. Provides 1 channel 9~36VDC power source output for external device, saving wiring  cost;
  19. Up to 10 SMS Alert and dial numbers, can program to receive specified alarm message.
  20. 10 authorized numbers can switch on/off device with a free charge call at the specified time;
  21. Inbuilt 8G SD card to save up to 100000 historical data and events;
  22. Inbuilt large capacity automatically rechargeable backup battery;
  23. Industrial class design suitable for long time work applications;
  24. using metal shell, protection class IP30. Metal shell and system security isolation, especially suitable for industrial applications in the field;
  25. L70 * W88 * H30mm, compatible wall installation and DIN35mm industrial rail installation.



Reference Scope

DC Power supply

Standard adapter: DC 12V/1.5A  Range 9-36VDC

Power consumption

Standby:12V/70mA;  Working Max.: 12V/300mA

GSM Frequency




TCP/IP stack


SIM interface

Supporting Dual 3V Nano SIM Card

External antenna

SMA Antenna interface, 50 Ohm, Gain: 3dB

Serial Interfaces

1 USB Port


SMS, GPRS UDP,TCP, Modbus RTU over TCP,Modbus TCP, MQTT and more equipment protocols can be added according to requirements.


1 RJ45 Ethernet port for connect internet,WAN or LAN.


2 RS485, Support Transparent transmission, Modbus RTU Slave, Modbus RTU Master.

Digital Inputs

8 Digital input, NC/NO type, one of it can be used as Pulse Counters;

Analog Inputs

6 Analog Inputs. 12 bit resolution, 0-5V or 0-20mA or 4-20mA;

Optional: each AIN can change to PT100 RTD inputs.

Temp.&Hum Inputs

Temperature range: -40°C to +80°C, Humidity Range: 0~100%RH;

Relay Outputs

4, Rated: 5A/30VDC,5A/250VAC

Power Outputs

1 Port, for external device;

Mapping Registers


Memory Capacity

Internal 8G SD card inside, can save the data for 100000events.

Backup Battery

3.7V 1200mAH

Temperature range

-10-+70 °C

Humidity range

Relative humidity 95% (condensation free)

Exterior dimension


 Weight  500g


This GSM GPRS 3G 4G Cellular IOT Modbus RTU compatiable below metioned certificates and references standards:

EMI Standard :
EN 61000-3-2:2014
EN 61000-3-3:2013

EMS Standard:
EN 55024:2010+A1:2015
EN 1000-4-2:2009
EN 61000-4-5:2014;
EN 61000-4-6:2014;
EN 61000-4-8:2010
EN 61000-4-11:2004

CE-LVD Standards:
IEC 60950-1:2005+A1:2009+A2:2013
EN 60950-1:2006+A2:2013
EN 62311:2008

ETSI EN 301 489-1 V2.2.0(2017-03)
ETSI EN 301 489-17 V3.2.0(2017-03)
ETSI EN 300 328 V2.1.1 (2016-11)


Cellular RTU  X1
AC/DC AdaptorX1
GSM/3G/4G Antenna X1
User Manual X1
PC ConfiguratorX1



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