C305 (discontinued)

Low cost industrial telecontrol system & M2M/IoT gateway with data logger

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


Low budget – many features

2G/GPRS mobile radio
Control (PLC)
Data Logger
Fault warning device

The low-cost C305 combines many functions in one device, from an integrated 2G/GPRS modem and programmable controller (PLC) to a professional data logger and fault indicator. It is the ideal device for demanding and cost-sensitive M2M and IoT applications that require high reliability and easy integration.

Integrated mobile communication

The C305 has a 2G/GPRS modem and brings mobile communication directly into your applications. Easy to use for connection to all leading cloud platforms, as fault indicator directly with SMS or voice with IVR (Interactive Voice Response) and DTMF or for communication with other Pro Series devices. Thanks to the high-level integration into the development environment (IDE), programming distributed applications is just as easy as programming a single PLC.

Performance and security for edge computing

The C305 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.

I/O interfaces

The C310 has 5 digital inputs (4 of which can be configured as S0), 4 digital solid state outputs (36V / 1.5A), 2 flexibly configurable analog inputs and outputs each.

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)
  • 3.5 MB persistent data Flash
  • 1 MB circular data logger
  • 8 KB FRAM (unlimited write cycles)
  • Real-time clock with battery backup


  • 4x bicolour LED
  • Piezo-buzzer
  • Reset / Recovery - Switches


  • Integrated firewall
  • AES-128 Encryption
  • Certificate management


  • Persistent DataFlash (data logger)
  • Battery-buffered S-RAM
  • Internal flash drive
  • Circular data logger


  • Multi-Band 2G/GPRS Class B Multislot 10
  • 2G: 850/900/1800/1900 MHz
  • DTMF Decoder / Transmitter
  • Voice Messages / IVR
  • SMS / PDU
  • Mini SIM (1.8 / 3 V)
  • eSIM (option)


  • Full Digital Audio System
  • Transferring, saving, and playing audio
  • GSM audio support (DTMF)

Wired communication

  • 1x RS232 (Service)

Digital I/O

  • 4 x Digital solid state output (max. 36 V - 1.5 A)
  • 5 x digital input
  • 4 x IEC62053-31 Class A input (S0) configurable
  • Input #5 configurable as "Wake Up"

Analog I/O

  • 2x analog input (0..10V or 0..20mA)
  • 2x analog output (0..10V or 0..20mA)
  • 12 bit resolution; •0.3
  • Low pass filter
  • Transient protection

Electrical data

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

Battery and charging logic

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


  • 5 power saving modes
  • smaller 600 μA in powerdown-mode
  • Events: Timer, digital input, RS232, GSM, CAN, Power Change
  • Disable external power supply


  • 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 antenna connection): 157 (W) x 58 (L) x 86 (H)
  • DIN rail (EN60715, 9 units)
  • Weight approx. 430g (without accessories)


  • CE EU EMC directive 2004/108/EU
  • Applied R&TTE directive
  • GSM engine: CE/GCF/FCC/PTCRB