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641M-4 4G-LTE IOT Router

641M 4G Router.png

The ELPRO 641M-4 is targeted at enabling your devices to access the Internet of Things (IoT) and Industry 4.0.


Secure connectivity of your devices has never been so important in today’s industrial world. With the 641M-4 cellular modem, there is a secure, fast, reliable, and simple way to IIoT enable devices for remote monitor and control of industrial plant/equipment and environmental applications.


Using the 4G /LTE broadband cellular technology including 4GX, the 641M-4 ensures fast, reliable, and consistent connectivity with mission critical field devices and assets.


For Internet of Things or Industry 4.0 applications the 641M-4 offers a cost-effective full featured industrial grade router for WAN connectivity. Additionally, the 641M-4 can provide gateway from Modbus to MQTT or MQTT with SparkplugB to suit a range of SCADA applications.


Supporting a wide range of interfaces including, Ethernet, RS232, RS485 and discrete inputs/outputs, the 641M-4 is a flexible and reliable connectivity solution for remote access to IIOT/Industry 4.0 devices.



• Cellular 3G/4G/LTE CAT4 router, including Band 28 support

• IEEE 802.11b/g/n, Access Point (AP), Client, 2*2 MIMO 300Mbps

• Compact industrial metal enclosure with DIN rail mounting for easy integration into machines or electrical cabinets

• 4 x Ethernet Ports - 10/100M LAN / WAN

• RS232/RS485 Serial, 2 digital Inputs and 2 digital outputs

• Dual SIM card support

• IPSec & OpenVPN Client & Server, L2TP, PPTP, GRE, Port Forward, DMZ

• NMEA 0183 GPS Reporting • Modbus RTU, TCP, MQTT and SparkplugB support

• Internal serial server

• Very wide power supply range supporting 9 to 48Vdc input

• SMS to read or control inputs/outputs, router status/alarm/state

• LAN Fallback for redundant networks

• Enhanced security for both cyber and data transmission

• Antenna diversity for Cellular bands



• Water/Waste Water municipal applications
• Oil & Gas and Mining connectivity
• Embedding in machines for factory automation
• Traffic control systems
• Extending SCADA radio networks in water and oil and gas systems
• Alternative energy systems, such as Wind Turbines




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