IOMod Meter – meter module for LV and MV.


IOMod Meter is a stand-alone metering measurement module for voltages and currents based on sensors technology with communication support based on Modbus RTU, IEC 60870-5-101, and IEC 60870-5-103 protocols.

Designed to measure voltage and current values with high accuracy in real-time. IOMod Meter can be used for numerous applications like electrical distribution substations, photovoltaic and hydropower plants, and railway power supplies where the user needs them.

IOMod Meter calculates neutral current and voltage RMS values I0 and U0 as well as many other measurements like active, reactive, apparent power for every phase, power factors per phase, phase angles for currents and voltages, and harmonics.


  • Analog inputs measurement in 16-bit resolution
  • 3x low-power (LoPo) current measuring inputs (225 mV) or 3x1A/5A CT with the adapter.
  • 3x low-power (LoPo) voltage measuring inputs (3.25 V/√3) or 3x100V/400V VT with the adapter.
  • Frequency acquisition (nominal frequency 45 to 65 Hz).
  • Calculation of RMS values for currents, phase, and phase-to-phase voltages.
  • Calculation of:
    • Frequency;
    • Active, reactive, and apparent power;
    • Neutral voltage, neutral current;
    • Power factor;
    • Phase angle;
    • Harmonics calculation;
  • Communication port: RS485
  • Communication over Modbus RTU, IEC 60870-5-101, and IEC 60870-5-103 protocols.


Article numberIOMOD-Meter v1
Product Description3 Current sensor inputs and 3 Voltage sensor inputs module
Configuration softwareIOMOD Utility, Serial console (putty)*
Warranty2 years
Measurement values and functions
Analog inputs6x 16-bit resolution
Input typesChannel-independent
Current inputs3
Current inputs measurement range225 mV (IEC 60044-8) with external adapter 1A / 5A
Current input impedance1 MΩ; < 170 pF
Voltage inputs3
Voltage inputs measurement range3.25 V/√3 AC (IEC 60044-7) with external adapter 100VAC / 400VAC
Voltage input impedance1 MΩ; < 170 pF
Frequency measurement range45..65 Hz
Overvoltage protection±20V
Interface and communication
RS485 interfaceANSI/TIA/EIA-485-A-1998
Communication protocols– Modbus RTU Slave;
– IEC 60870-5-101 Slave;
– IEC 60870-5-103 Slave.
Baudrate600 – 115200 baud
ParityNone, Even, Odd
Terminating resistors120 Ohm (configurable)
USB interface
TypeMini USB
UseConfiguration/Firmware upgrade
Power supply
Auxiliary power supply9-33VDC (full range)
Power consumption40mA @ 12VDC, 20mA @ 24 VDC
Insulation voltage3 kV
Operating conditions
Operating temperature-40°C … 85°C
Storage temperature-40°C … 85°C
Humiditymax. 95 % relative Feuchte bei 40° C
Protection classIP20
Dimensions and installation instructions
Case height x width x depth119 x 17.5 x 101 mm
Installation typeDIN Rail mounting
* IOMOD Utility is configuration tool for IOMOD devices with firmware v2.x, for devices with fw v1.x configuration can be done via USB port as Serial console interface like Putty.



IOMOD-Meter v1 – 3xCurrent 3xVoltage sensors module with IEC-101, IEC103, Modbus-RTU protocol support.

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