The Mini RTU series devices are made to for fill Utilities and distribution grids need in automation. As well this products line is well used as control and monitoring equipment for renewable energy sources (solar, wind and hydro). Due to modularity and variety of modules and functions this series can implement different applications from simple protocol conversion with only WCCLite due to complex tele-control applications with implemented algorithms, mobile connectivity and fault passage indicators functions.

The Mini RTU series devices are advanced RTU functions with unique functionality like data logger capabilities to collect internally measurements and events data as time-series data and ability to securely transfer information into on Premise or Cloud based monitoring systems. The Mini RTU series supports as well and networking functions (switch, VPN server/client, rules based firewall, RESTful API) that allows easily to implement networking tasks on RTU it self without any additional equipement and improve Cyber security.


  • Versatile communications including most of energy protocols;
  • Expandable with I/O modules and modules not limited in RACK;
  • Simple engineering with the integrated web interface and free configuration tools;
  • Small for factor allows to fit into retrofit projects;
  • Mechanical design for DIN-rail mounting;
  • Wide operating temperature range -40°C … 75°C;
  • Easy remote parametrisation via internet and VPN;
  • Integrated programmable user programs;
  • Integrated I/O intelligence independently behave without interaction with main CPU;
  • Rich Cyber security features:
    • BDEW white paper conformity;
    • IPsec and IKE encryption
    • IPsec and OpenVPN VPN client;
    • Role-based access control (RBAC) for power system management;
    • Radius support for remote user rights management;
    • SSL (TLS) encryption for IEC 60870-5-104 and IEC 61850;
    • https protocol;
    • Firmware signature;
    • Security syslog;
    • Rules based Firewall;


Device dataDescription
Article numberMini RTU series
Product descriptionMini RTU series is combination of products including WCCLite as CPU, CLMOD as interface converters and IOMOD devices as I/O and FPI modules
Configuration softwareWCC Excel utility, Putty, Web browser
Warranty2 years
GeneralMain RTU features
FunctionalityFreely scalable RTU with included all supported protocols and functions for utilities, grid and renewables automation solutions.
RTU functionality– Reading Process events from the input/output modules.
– Send commands to the output modules.
– Communication with sub devices to collect events and execute commands.
– Communicating with control systems and other IOT systems.
– Handling the configuration via WEB Browser and Elseta configuration tools;
– Monitor communication status with sub devices.
– Sequence-of-Event (SOE).
– Execute user scripts to enable custom automation and regulation algorithms.
– Connectivity: LAN/WAN, Mobile (4G LTE), VPN.
– Firewall (rules based).
Data exchangeMini RTU are able to support up to 16 host systems including hot-standby SCADA systems.
Every IEC 60870-5 protocol can have shared or independent buffers of events and support multiple SCADA communication at the same time.
Data collectionMini RTU series supports collection of data up to 50 sub devices, e.g. IED’s, meters, IO’s, Inverters. Each sub device connected to mini RTU is supervised by RTU and shown status in diagnostic screen.
PLCMini RTU series support:
– distributed PLC based IEC 61499 standard;
– Script execution engine (recommended) to write own programs based on LUA programming language.
Data storageRTU provide archive all data on non-volatile flash for events, measurements, counter values, security events.
Time managementmini RTU series provides multilevel time management solution CPU supports NTP, IEC 60870, DNP3 time sync multi sourcing and IOMOD devices has time sync option with IEC 60870 protocol firmware.
Time sync sourcesMulti time sync options (priority based):
– Internal RTC clock with battery basedmemory up to >15 years of life time;
– NTP (Network Time Protocol) over TCP/IP;
– IEC 60870-5 time sync support;
– DNP3 time sync support;
– IEC 61850 time sync support.
Time sync precisionThe time base operates with a time resolution of 1 ms.
Communication interfacesInterfaces for communication with IED’s, Meters, inverters, SCADA systems and etc.
Independent Ethernet ports2x 10/100 Mbps 10/100Base-T compliance IEEE 802.3, IEEE 802.3u standards, supports auto MDI/MDIX
Serial ports2x RS485 (Standard ANSI/TIA/EIA-485-A)
Serial ports1x RS232 (Standard EIA/TIA-232-E) Switchable with RS485 port1
Mobile communicationAvailable only with integrated WCCLite version with mobile communication module
Mobile technology support4G (LTE) – Cat 4 up to 150 Mbps, 3G – Up to 42 Mbps, 2G – Up to 236.8 kbps
Dual SIM card support2 SIM cards, auto-switch cases: weak signal, data limit, no network, network denied, data connection fail
Other mobile info Signal strength (RSSI), SINR, RSRP, RSRQ, RSCP, IMSI, ICCID, Signal strength LED indicators, SMS receive/send, APN management.
LED indicationTo indicate traffic on interface every interface has independent LED indication on receive/send packet.
Supported protocolsHost and sub device communication protocols
IEC 60870IEC 60870-5-101 Master support
IEC 60870-5-101 Slave support
IEC 60870-5-103 Master support (WCCLite only)
IEC 60870-5-103 Slave support (IOMOD modules only)
IEC 60870-5-104 Master support
IEC 60870-5-104 Slave support (KEMA Cert.) + IEC 62351 (parts -3) security standard is supported TLS encryption
DNP3DNP3.0 TCP(LAN/WAN) Master support
DNP3.0 TCP(LAN/WAN) Slave support
DNP3.0 Serial Master support
DNP3.0 Serial Slave support
IEC 62351 (parts -3) security standard is supported TLS encryption
ModbusModbus RTU Master support
Modbus RTU Slave support
Modbus ASCII Master support
Modbus ASCII Slave support
Modbus TCP Master support
Modbus TCP Slave support
IEC 61850-8-1Client (Master) support of Editions 1, 2, 2.1
– MMS client
– Read services
– Write services
– Static data sets
– Report Control blocks
– Controls
– Discovery
Server (Slave) support of Editions 1, 2, 2.1
– MMS server
– Read services
– Write services
– Static data sets
– Report Control blocks
– Controls
– Discovery
IEC 62351 (parts -3, -4, -5 and -6) security standard is supported for authentication and TLS encryption
Meter protocolsM-bus Master support
DLMS/COSEM master support
IEC 62056-21 master support
IEC 62056-31 master support
Other protocolsMQTT, RESTful API
Cyber securityComply with BDEW white paper, IEC 62351 and general cyber security practices
Secure accessSecure access to all services (HTTPS, SSH)
RBACRole-based access protection with login and password
IEC 62351 by security standard is supported.
User administrationLocal users administration with different access levels
Central user administration via RADIUS
Password complexity Fully customisable password policy:
– minimum password length,
– maximum password lifetime,
– usage of lower case characters,
– upper case characters,
– numeric,
– special characters.
Certificate storage Internal Crypto Store for certificate management
Import of certificates
Input/Output modules
IOMOD 8DI8DO8x digital inputs and 8x digital outputs (transistor) module
Digital inputs8
Input voltage12-24 VDC
Input signal polarityYes, configurable
Input inversionYes, configurable
Input groupingup to 4 groups DPI
Digital outputs8 (open collector)
Output current<500mA (per output)
Output voltage12..24VDC
Output functionsPermanent or Pulse output
Output pulseConfigurable in ms (0..60s)
Output feedback timeConfigurable in ms (0..60s)
Output groupingup to 4 groups DCO
IOMOD 16DI 16x digital inputs module
Digital inputs16
Input voltage12-24 VDC
Input signal polarityYes, configurable
Input inversionYes, configurable
Input filterYes, configurable (0..256000ms)
Input counter16 (one per input) with reset function
IOMOD 8AI8x analog inputs module
Analog inputs8 configurable analog inputs
Inputs resolution16 bit
Channel-independent programmable input typesVoltage and current inputs
Voltage input rangesBipolar: +-10.24V, +-5.12V, +-2.56V
Unipolar: 10.24V, 5.12V
Current input rangesBipolar: +-51.2mA, +-25.6mA, +-12.8mA
Unipolar: 51.2mA, 25.6mA
Overvoltage protection+-20V
IOMOD 4RTD4x temperature sensors module
Analog inputs4 RTD (PT100 / PT1000)
Input supports sensorsPT100 and PT1000 temperature RTD sensor
Input connection2, 3 or 4 wires connection
Temperature measurement range-200 to 800 °C using platinum RTD sensors
Accuracy0.5°C accuracy for all operating conditions
IOMOD 4Cs4Vs4xCurrent 4xVoltage sensors module
Analog inputs8x 16-bit resolution (Channel-independent)
Current inputs4
Current inputs measurement range225 mV (IEC 60044-8)
Current input impedance1 MΩ; < 170 pF
Voltage inputs4
Voltage inputs measurement range3.25 V/√3 AC (IEC 60044-7)
Voltage input impedance1 MΩ; < 170 pF
Accuracy1% (for all channels)
Frequency measurement range45..65 Hz
Overvoltage protection±20V
Power supply
Auxiliary power supply9-33VDC (full range)
Insulation voltage3 kV
Operating conditions
Operating temperature-40°C … 55°C
Storage temperature-40°C … 85°C
Relative humiditymax. 95 % (non condensing)
Protection classIP20
Installation typeDIN Rail mounting
Case height x width x depthWCCLite – 119 x 22.5 x 101 mm
IOMOD – 119 x 17.5 x 101 mm



WCCLite without modem – WCCLite without modem

WCCLITE 4G/3G/2G – WCC Lite v1.4 with 4G/3G/2G Modem

IOMOD-8DI8DO-IEC103 – 8 Digital inputs and 8 digital outputs module with IEC 60870-5-103 Slave protocol

IOMOD-16DI-IEC103 – 16 Digital input module with IEC 60870-5-103 Slave protocol

IOMOD-8AI-IEC103 – 8x analog input module with IEC 60870-5-103 Slave protocol

IOMOD-4RTD-IEC103 – 4xChannel PT100,PT1000 input module with IEC 60870-5-103 Slave protocol

IOMOD-4CS4VS – 4xCurrent 4xVoltage sensors module with IEC-101, IEC103, Modbus protocol support.

On request*:

IOMOD-8DI8DO-IEC101 – 8 Digital inputs and 8 digital outputs module with IEC 60870-5-101 Slave protocol

IOMOD-8DI8DO-Modbus – 8 Digital inputs and 8 digital outputs module with Modbus RTU Slave protocol

IOMOD-16DI-IEC101 – 16 Digital input module with IEC 60870-5-101 Slave protocol

IOMOD-16DI-Modbus – 16 Digital input module with Modbus RTU Slave protocol

IOMOD-8AI-IEC101 – 8x analog input module with IEC 60870-5-101 Slave protocol

IOMOD-8AI-Modbus – 8x analog input module with Modbus RTU Slave protocol

IOMOD-4RTD-IEC101 – 4xChannel PT100,PT1000 input module with IEC 60870-5-101 Slave protocol

IOMOD-4RTD-Modbus – 4xChannel PT100,PT1000 input module with Modbus RTU Slave protocol

* – IOMOD devices 8DI8DO, 8AI, 4RTD, 16DI, 8DI2RO, HT with firmware versions v1.x supports only 1 protocol. To change protocol is required to change firmware. All types of firmware are accessible to all customers without any additional payment.

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