CX351 (discontinued)

Industrial Telecontrol System & M2M/IoT Gateway with Wireless M-Bus

Industrial M2M/IoT telecontrol system with UMTS / 3Gmobile network and numerous interfaces and protocols

Perfect for edge computing with IEC 61131-3 and connection to all leading cloud platforms.


One device – many functions

4G/LTE mobile
Control (PLC)
Data Logger
Touch display
Fault warning device

The CX351 combines many functions in a single device, from an integrated 3G/UMTS modem to a programmable controller (PLC) with a touch display as the operating interface to a professional data logger and fault indicator. Highly communicative thanks to numerous interfaces and protocols and almost unlimited expandability, it is the ideal device for demanding M2M and IoT applications, especially for energy data acquisition via wireless M-Bus.

Energy data acquisition with wireless M-Bus

The CX351 is equipped with a wireless M-Bus radio module for a range of up to 1000m(ISM band) and can thus easily poll smart meters, but general sensor networks are also possible. High-level support in the IDE with full encryption (AES-128) allows easy and secure integration.

Logo WMBus

Performance and security for edge computing

The CX351 is based on a hardened Linux architecture with IEC 61131-3 runtime environment. The Arm® Cortex®– A5 processor with floating point support, DSP functions and cryptographic acceleration offers more than enough power for your edge computing applications. TLS/SSL support for all important TCP based protocols (e.g. MQTT, SMTP, TCP/IP Sockets) with complete certificate management effectively protects your communication, e.g. with a cloud.

I/O interfaces for all needs

The CX351 has 8 digital inputs (4 of which can be configured as S0), 8 digital solid state outputs (36V / 1.5A), 4 flexibly configurable analog inputs and outputs each. The interface equipment is completely transparently expandable via Modbus modules for the user software and can be extended almost indefinitely.

Versatile communication

In addition to the mobile network connection, the CX351 has a large number of interfaces: 100 Base-T Ethernet, CAN-2.0, RS-232, RS-485, 1-Wire, WLAN, Bluetooth LE und USB. For easy use of the interfaces, the development environment provides support for a variety of protocols such as TCP/IP, UDP, SMTP, FTP, MQTT, 1-Wire, M-Bus, wireless M-Bus, Modbus (Master and Slave).

All details

If you need further information: We have compiled the essential technical data and are at your disposal for a consultation by phone or email.

Hardware core

  • Cortex-A5 32Bit ARM
  • HW floating point and DSP
  • 128 MByte LP-DDR RAM
  • 512 MByte NAND Flash
  • 16 MByte NOR Flash
  • 8 MByte DataFlash
  • 128 KB SRAM with battery backup
  • Real-time clock with battery backup


  • Touch screen (240x160px) with lighting
  • Fully programmable incl. Graphs, buttons, dialogs
  • 4x bicolour LED
  • Reset / Recovery - Switches
  • Dip switch
  • Config switch for analog mode, RS485 and CAN scheduling


  • Integrated firewall
  • TLS/SLL support with certificate management
  • TLS/SSL support for SMTP, MQTT, FTP, HTTP, Gateway 2 and TCP/IP sockets
  • Hardware-supported cryptography: AES-128, AES-192, AES-256, DES, Triple-DES, HASH, RND and RSA


  • Persistent DataFlash (data logger)
  • Battery-buffered S-RAM
  • Internal flash drive
  • Circular data logger
  • SD card slot
  • Flash memory via USB


  • Multi-band 3G/UMTS with fallback to 2G (GPRS)
  • 3G: 800 / 850 / 900 / 1900 / 2100 Mhz
  • 2G: 850 / 900 / 1800 / 1900 MHz
  • DTMF Decoder / Transmitter
  • Voice Messages / IVR
  • Mini SIM (1.8 / 3 V)
  • eSIM (option)

wireless M-Bus

  • Range up to 1000m
  • 868 Mhz (Option: 433 / 169 MHz)
  • AES-128 Encryption
  • Support for C, R, S, T modes
  • High-Level IDE support
  • SMA-M antenna connector


  • Wi-Fi in the 2.4 GHz ISM band
  • IEEE 801.11b/g/n/d/e/h/i
  • WPA/WPA2 Encryption
  • Up to 150 MBit/sec


  • Classic and Low Energy (LE)
  • BT 2.1 + EDR up-to 3 Mbps
  • BT 3.0 and 4.0 Dual mode
  • Co-existence with Wi-Fi


  • Full Digital Audio System
  • Transferring, saving, and playing audio
  • Line+Speaker Output
  • Microphone input
  • GSM audio support

Wired communication

  • 100BASE-T Ethernet
  • CAN 2.0B (fully Featured)
  • 2x RS232
  • 1x RS485
  • 1-Wire Bus
  • 2x USB (Host/Service)

Digital I/O

  • 8 x Digital solid-state output (max. 36 V - 1.5 A)
  • 8 x Digital input
  • 4 x IEC62053-31 Class A input (S0) configurable
  • Input #1 configurable as "Wake Up"
  • expandable with Modbus modules

Analog I/O

  • 4x Analog input (0..10V or 0..20mA)
  • 4x Analog output (0..10V or 0..20mA)
  • 12 bit resolution; •0.3
  • Low pass filter
  • Transient protection
  • expandable with Modbus modules

Electrical data

  • Operating voltage 8..36 V DC
  • Power consumption 50-100 mA @12 Vdc
  • Reverse polarity protection
  • 5 VDC-out x 300 mA
  • USB 5 VDC x 500 mA

Battery and charging logic

  • Internal 2Ah Li-Ion Battery
  • Intelligent charger with temperature controller and support for temperatures below zero degrees
  • Battery temperature sensor
  • Support for larger external batteries


  • Power-saving modes
  • less 0,5 mA in powerdown-mode
  • Events: timer, digial input, touch screen, CAN, power change
  • Battery temperature sensor
  • Support for larger external batteries


  • Operating: -30..+60 °C
  • Battery charging: -10..+45 °C
  • Storage: 0..+45 °C (recommended)
  • Humidity: 5..90 (non-condensing)
  • Protection class: IP20

Mechanical data

  • Dimensions (mm, without terminals): 160 (W) x 53 (L) x 89 (H)
  • Self-extinguishing plastic PC/ABS
  • Hat rail (EN60715)


  • 2014/53/EU Radio Equipment Directive
  • 2014/30/EU EMC Directive
  • 2011/65/EU RoHS Directive


  • CX351 data sheet
  • CX351 Technical Manual