Ultra-compact telematics system with 3G / UMTS, GNSS and CAN

A robust module (IP66) for demanding telematics applications that place high demands on positioning, communication and free programmability (edge computing)


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One device – all functions integrated

3G/UMTS mobile communications
GNSS receiver
Data Logger
Control (PLC)

Precise positioning with GPS, GLONAS, Galileo and QZSS; 3D accelerometer, full-featured CAN 2.0 connectivity, additional interfaces (digital I/O, analog input, 868 MHz ISM RF) and protocols (including Modbus, MQTT) as well as a 3G/UMTS mobile network connection make the C520 the ideal platform for demanding telematics applications in harsh and cramped environments.

Powerful vehicle integration

A complete CAN 2.0B interface with hardware filtering and multi-speed support allows comprehensive data acquisition in vehicle installations.

Precise positioning

The C521 has a highly sensitive GNSS receiver with support for GPS, GLONASS, Galileo and QZSS (99 acquisition channels / 33 tracking channels) with noise suppression and jamming protection. The support of DGPS (WASS, EGNOS, MSAS and GAGAN) further increases the positioning accuracy. A 3-axis accelerometer completes the equipment.

Sophisticated energy management

A built-in UPS (integrated LiIon battery), low power consumption and five execution speeds with wakeup events from various sources allow safe operation even on switched on-board power systems.

Performance and security for edge computing

The C521 is based on an RTOS real-time core with IEC 61131-3 runtime environment. The 32-bit ST Arm®processor provides more than enough power and memory for your edge-computing applications. AES encryption and a certificate management for all important TCP based protocols (e.g. MQTT, SMTP, TCP/IP Sockets) offer a high security for your communication, e.g. with a cloud.

Integrated mobile communication

The C521 has a 3G/UMTS modem with fallback to 2G/EDGE/GPRS, bringing mobile communications directly into your applications. Easy to use for connection to all leading cloud platforms, as fault indicator directly with SMS or for communication with other M2M controllers. Thanks to the integrated development environment (IDE), programming distributed applications is as easy as programming a single PLC.

I/O interfaces

The C521 has 2 digital inputs, 2 digital solid state outputs (36V / 0.75A) and 1 analog input. Additional sensor technology can be adapted via 686 MHz ISM RF.

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

  • 32-bit ST ARM CPU
  • 1.088 KB fast execution RAM
  • 2.304 KB Flash (firmware/application)
  • 4 MB FAT32 Flash Drive
  • 1 MB circular data logger
  • 4 KB FRAM (unlimited write cycles)
  • Real-time clock with battery backup


  • Integrated firewall
  • AES-128 Encryption
  • Certificate management


  • Persistent DataFlash (data logger)
  • Battery-buffered S-RAM
  • Internal flash drive
  • Circular data logger
  • micro SD card slot (up to 32 GB)


  • Multi-band 3G/UMTS/HSPA with fallback to 2G (GPRS/EDGE)
  • 3G: 800 / 850 / 900 / 1900 / 2100 Mhz
  • 2G: 850 / 900 / 1800 / 1900 MHz
  • SMS / PDU
  • Micro-SIM (1.8 / 3 V)


  • CAN 2.0B
  • Hardware-Filtering
  • Multi-Speed -Support


  • Multi GNSS: GPS, GLONASS, Galileo and QZSS
  • 99 acquisition / 33 tracking channels
  • A-GPS capable
  • Anti-jamming, Noise cancellation
  • Genauigkeit < 2,5m CEP

Wireless communication

  • 868 MHz ISM RF

Digital I/O

  • 2 x Digital solid state output (max. 36 V - 0.75 A)
  • 2 x digital input
  • Transient protection
  • Low pass filter

Analog I/O

  • 1x analog input (0..10V)
  • 10 bit resolution; ±1.5% FSR @ 25°C
  • Low pass filter
  • Transient protection

Electrical data

  • Operating voltage 8..36 V DC
  • Reverse polarity protection

Battery and charging logic

  • Internal 0,9Ah Li-Ion battery
  • Intelligent charger with temperature controller and support for temperatures below zero degrees
  • Battery temperature sensor


  • Power-saving modes
  • Events: Timer, digital input, CAN, GSM, accelerometer, power change
  • Wait for event, from: 600 μA @12V
  • Voltage monitoring


  • Operation: -30..+55 °C
  • Battery charging: -10..+45 °C
  • Storage: 0..+45 °C (recommended)
  • Humidity: 5..90 (non-condensing)
  • IP-66

Mechanical data

  • Black UL94 plastic housing
  • Sealing membrane
  • Dimensions (mm): 92 (W) x 58 (L) x 30 (H)
  • Weight: approx. 250g (without accessories)
  • 50cm connection cable


  • E1 type approval: 2004/104/EC UNECER10-ed3
  • CE mark / Applied R&TTE directive
  • GSM engine: CE/GCF/FCC/PTCRB