Leading Edge Networking Solutions


3G/4G LTE Cellular to Ethernet and Serial Secure Modbus Gateway/Router


A compact and rugged 4G Modbus Gateway
Based on Industrial-grade hardware, the MB5901B Series is a cost-effective Modbus Gateway for seamless conversion between Ethernet-based Modbus TCP and serial-based Modbus RTU/ASCII for demanding applications such as Industry 4.0 and Smart Grids. Its rugged, reliable hardware features high EMC protection, wide temperature operation, and programming and installation flexibility in one device, while its advanced performance protects your data over the Internet with secure IPsec VPN or OpenVPN tunnels, with its powerful CPU providing up to 37.9Mbps* software-assisted AES encryption.

Flexibility with Advance Performance
In addition to offering installation flexibility, the MB5901B Series Flexible configuration options enable it to be setup over Ethernet via Telnet, Web Browser, Serial Console, or our Windows Utility.
Virtual COM software provides a virtual environment for applications when accessing MB5901B through TCP. Special management via SMS can be performed, such as polling data, issuing commands and system reboots. This is Maintenance 4.0. A dedicated I/O version provides 2 x Digital Inputs and 2 x Digital Outputs. These are also accessible via dedicated Modbus Registers. The B version model also provides 15 seconds of back-up power in the event of a power failure, allowing the device to relay the failure to the host.
* : test carried out with one VPN-IPsec Tunnel, Peer-to-Peer mode, Ethernet cable. Performance can change based on the Cellular Network.

SE5901B 2L


  • GPRS/3G/4G Cellular Protocol Gateway with extensive LTE Band support:
    - EU Model: 2100/1800/850/2600/900/800MHz (B1/B3/B5/B7/B8/B20)
    - US Model: 1900/AWS/850/700/700/1900MHz (B2/B4/B5/B13/B17/B25)
  • Industrial-grade hardware for operating in harsh environments
  • Wide temperature range for operations at extreme temperatures
  • VPN over IPsec or OpenVPN with throughput up to 37.9Mbps*
  • 1 x 10/100/1000Mbps Ethernet port, 1 x RS-232/485 port,up to 921.6 Kbps
  • Modbus TCP to RTU/ASCII conversion
  • Management via Web Browser, SMS, SNMP v1/v2c/v3
  • 2 Digital Inputs; 2 Digital outputs / Additional RS-232 in I/O version
  • Additional embedded power-bank for fault-relay capability (B version)

ModbusTCP Logo

MB5901B Application Scheme 3G Series 4G Series

MB5901B-D3G - 1x RS232/422/485 (DB9M)+ 1x 10/100/1000Base-TX (RJ45)

MB5901B-IO-D3G  - 1x RS232/422/485 (TB)+ 1x RS232 (TB) + 1x 10/100/1000Base-TX (RJ45) + 2x I/O

MB5901B-IO-D3G-GPS - 1x RS232/422/485 (TB)+ 1x RS232 (TB) + 1x 10/100/1000Base-TX (RJ45) + 2x I/O + GPS

MB5901B-D4G - 1x RS232/422/485 (DB9M)+ 1x 10/100/1000Base-TX (RJ45)

MB5901B-IO-D4G  - 1x RS232/422/485 (TB)+ 1x RS232 (TB) + 1x 10/100/1000Base-TX (RJ45) + 2x I/O

MB5901B-IO-D4G-GPS - 1x RS232/422/485 (TB)+ 1x RS232 (TB) + 1x 10/100/1000Base-TX (RJ45) + 2x I/O + GPS

MB5901B-IO-4G-B - 1x RS232/422/485 (TB)+ 1x RS232 (TB) + 1x 10/100/1000Base-TX (RJ45) + 2x I/O + Battery


Wireless Interface: GSM/ GPRS/ EDGE/ UMTS/ HSPA+/ SCDMA/ LTE

Serial RS232

  • Serial Baud Rate: 1200 bps to 921 Kbps
  • Data Bits: 7, 8
  • Parity: odd, even, none, mark, space
  • Stop Bits: 1, 2
  • Signals: TxD, RxD, RTS, CTS, DTR, DSR, DCD, RI, GND
  • flow Control: XON/XOFF, RTS/CTS, DTR/DSR


  • 9~48 VDC power input at 3-pin terminal block
  • Overload Current Protection Present

Operating Temperature: -40 to 85°C
Operating Humidity 5% to 95% Non-condensing

Warranty 5 years


MDR-45 series DIN-Rail power supply


  • Protocols: IPv4, ICMP, TCP, UDP, DHCP Client, SNMPv1,v2c,v3, HTTP, HTTPS, Telnet, RFC2217, RSTP, Security via OpenVPN Client/Server or IPsec VPN (peer-to-peer or peer-to-side) with up to 37.9Mbps VPN throughput, PPTP, and SMTP/TLS
  • Management: Web, Device Management Utility, Telnet, SNMPv1/v2c/v3, SMS
  • Virtual COM: Windows/Linux redirection software
  • Modbus Gateway Supported Modes: Ethernet: Modbus TCP Server/Client(or VCOM); Serial: Modbus RTU/ASCII (master/slave)
  • Maximum number of Modbus clients/slaves: Modbus TCP: Maximum 16 clients; Maximum 32 slave connections