Modular, secure and IoT-ready remote control unit

Unlocking secure remote control, advanced monitoring & data acquisition, and local automation features in power plant and HV/MV substation environments with the STCE-SG Modular Mini-RTU.

STCE-SG is a modular Remote Terminal Unit (RTU) engineered for mission-critical applications in power plant and HV/MV substation environments to enable prompt and flexible communication with network management centers.

Featuring compact DIN-rail mounting, STCE-SG combines secure remote-control capability, advanced data acquisition power, a rich set of communication protocols, exceptional performance, PLC programming support, and embedded cybersecurity features to fulfill complex Industrial IoT requirements, ensuring secure cryptographic operations and the protection of sensitive data.

Advanced configuration and diagnostic tools enable timely and effective maintenance interventions. STCE-SG effortlessly interfaces with local SCADA systems and multiple control centers using industry-standard protocols such as IEC 61850, IEC 60870-5-101/104, and Modbus (Master/Slave). Furthermore, STCE-SG serves as a versatile protocol gateway both for IoT and complex telecontrol applications securing conversion of the legacy serial protocols to modern IP-based protocols. To enhance flexibility, STCE-SG can be expanded with dedicated I/O modules, accommodating a wide range of integration needs.

Key features

Modular DIN-rail form factor: compact, versatile design for easy installation.

IEC 61131 PLC programming: empower your system with industry-standard PLC programming.

IEC 62443-4-1/2: ensuring security for industrial automation and control systems.

Communication protocols: full compatibility with IEC 60870-5-101/104, Modbus RTU/TCP, Server/Client IEC 61850 ed.2, MQTT Pub/Sub, SNMPv3.

Embedded advanced security: STCE-SG offers an array of built-in security features, including port filtering, application firmware signature, configuration signature, secure boot, certificate management, data and communications security, access control and authentication methods, monitoring and diagnostics, and anti-tampering.

LoRaWAN IoT gateway and end node: expanding industrial IoT connectivity.

Flexible management and licensing: customize your system to meet specific needs.

Analog & Digital I/O: versatile data acquisition capabilities.

Additional connectivity options: Bluetooth Low Energy (BLE) 4.2, Wi-Fi 802.11 a/b/g/n/ac.


CPU / CPU CYBERSEC: empowering performance and embedded security.
DC PSU: flexible power supply solution.
ODI / OAI / DCC / AIAC / OAO* / PT100*: versatile data acquisition capabilities.
Time Sync and GPS: securing Time Synchronization and enabling high precision in distributed systems.
IoT & LoRa: expanding IoT connectivity options.

Modules and Interfaces

ARM i.MX7 Processor: Dual-core 1GHz + Cortex-M4 200MHz real-time co-processor, offering high-efficiency signal processing capability with low power consumption and cost-effectiveness handling up to 10.000 datapoints/connecting up to 7 centers in IEC 101/104 and 4 clients in IEC 61850/managing up to 2 remote IEDs and 2 local maintenance connections.

Memory: 1GB DRAM, 8GB flash memory, 8GB local storage.

Communication Ports: 1 x RS-232 (RJ45) and 1 x RS-485 (5-Pin) for all serial protocols, 2 x GbE – RJ45 10/100/1000BASE-T (ETH1, ETH2) for all IP slave/server protocols and WAN), 1 x RJ45 10/100BASE-T (ETH0) for local maintenance and all IP master/client protocols), and 1 x USB Micro B for local maintenance.

Wi-Fi Module: IEEE 802.11 ac/a/b/g/n for maintenance and MQTT (optional).

Operating Temperature: Standard (-25 ÷ +60°C) / Extended (-25 ÷ +70°C).

OS: Linux-embedded Yocto Project.

Communication protocols: IEC 60870-5-101/104, Modbus RTU/TCP, Server/Client IEC 61850 ed.2, MQTT Pub/Sub, SNMPv3. Additional protocols available upon request.

Embedded Security and Management

Access control and Authentication method: Role-Based Access Control in SSH/Web Server, Remote Authentication in Dial-In User Service (RADIUS).

Monitoring and Diagnostics: syslog, alarm and event logs, security log.

IEC 62443-4-1/2: security for industrial automation and control systems.

Data and communications security: TLS/AES encryption to provide confidentiality, integrity protection, and message level authentication between 2 endpoints of communication according to the IEC 62351-3.

PLC programming and automation

Cost-effective automation: reduce human decision-making efforts and enhance efficiency.
Real-time execution: execute freely programmable application programs in real time.
Full integration: seamlessly integrate with peripherals and runtime databases.
Support for IEC 61131-3 languages: choose from LD, FBD, SFC, ST, and IL.


Embedded FIPS 140-2 Level 3 crypto chip: ensures data security, confidentiality and integrity.
Anti-tampering: HW intrusion detection.
Communication segregation: dedicated ports for administration, maintenance, and remote-control centers.


Voltage options: 24 Vdc / 48 Vdc / 110 Vdc with optional redundancy.

Max output: 20W
          - 800mA @ 24 Vdc
          - 400mA @ 48 Vdc
          - 180mA @ 110 Vdc

Integrated self-diagnosis: ensures system reliability.

Digital I/O: versatile options for input and output control:
          - 2 x Digital Inputs: 24 Vdc, 2 mA / 48 Vdc, 4 mA / 110 Vdc, 4 mA
          - 1 x Digital Output (1A)

I/O modules

ODI: 16 digital inputs/module. Input voltage, current: 24 Vdc, 2 mA / 48 Vdc, 4 mA / 110 Vdc, 4 mA.
DCC: 8 digital outputs/module. Output type: electromechanical relay. Nominal current: up to 6A @ 250Vac.
OAI: 4 DC analog inputs/module. Input voltage, current: -10 ÷ +10V, -20 ÷ +20mA.
AIAC: 3 analog inputs in alternating current + 3 analog inputs in alternating voltage. 1A / 5A input from CT. 57.7V / 100V input from VT.

Time Sync and GPS

Ensure precision in your operations with time synchronization and optional GPS capabilities.
Timing: NTPv4 server, IEC 60870-5-101/104, IEC 1588 PTPV2, GPS receiver SELTA/Trimble.
IoT & LoRa

Learn more about IoT connectivity options.


Security for industrial automation and control systems
          - IEC 62443-4-1/2

Cybersecurity Hardware
          - FIPS 140-2 Level 3

EMC Directive 2014/30/EU
          - IEC 61850-3 ed2, IEC 61000-6-5, IEC 60255-26,
          - IEC 60870-2-1, EN 61000-6-2, EN 61000-6-4,
          - IEC 60255-27

Network access and secure communications
          - IEC60870-104 (IEC 60870-5-604),
          - IEC 61850-6, 7-1, 7-2, 7-3, 7-4, 8-1, IEC 62351-3

EMC RED Directive 2014/53/EU
          - EN 62311, EN 62369, ETSI EN 300 328 V.2.2.2

Environmental conditions
IEC 61850-3 ed2, IEC 60870-2-1, IEC 60068-2-2 Be test, IEC 60068-2-78 CAB test, IEC 60068-2-1 Ad test, IEC 60068-2-14 Nb test, IEC 60068-2-30 Db test, IEC 60068-2-1 Ab test, IEC 60068-2-2 Bb test

Vibration/shock tests
           - IEC 60255-21-1, IEC 60255-21-2, IEC 60255-21-3

Low Voltage Directive (LVD) 2014/35/EU
          - IEC 62368-1, IEC 61010-1, IEC 61010-2-30, IEC 61010-2-201


DP Selta IoT Suite: cloud IoT platform for utilities & energy.


Experience a new level of security, performance, and flexibility with the STCE-SG Modular Mini-RTU, engineered to excel in the most demanding industrial applications.