CLMod – RS485 to current loop converter


CLMod is RS485 to 20 mA current loop converter. CL Mod can remotely gather data from electricity meters. This converter was developed to read multiple meters data over 20mA current loop interface with long distance lines up to 2km. CLMod with 6 current loop interfaces is capable to readout data up to 30 meters (5 meters per single current loop). CLMod can is protocol agnostic you can use with any type of protocol.


  • 6 independant 20mA current loop interfaces
  • Galvanic 3kV(rms) isolation
  • LED indication of data transmission on every current loop interface
  • Supports 5 meters per current loop (30 meters total)
  • Baud rates: 300 to 19200
  • Automatic open loop detection and disconnection
  • Fail indication for each current loop
  • Integrated current loop protection
  • Compatible with Elgama Elektronika meters
  • RS485 interface for RTU/Datalogger
  • Operating temperature: -40°C +80°C
  • Dimension 101x119x17.5mm


  • Communication standard: RS485
  • Communication protocol: Modbus (RTU), DLMS/Cosem and IEC 62056-21
  • Speed: 300 – 19200 baud

Electrical characteristics

  • Termination resistor: Software selectable, 120Ω
  • Power supply: 24VDC / 21.6-26.4VDC (full range)
  • 3kV galvanic isolation with isolated DC/DC power supply inside(RS485 and power supply is isolated from current loop interfaces)
  • Integrated current loop protections:
    • Rated current: 0,2A
    • Max pule discharge current (8/20 µs): 10kA
    • Reaction time in µs: 1


Device data
Article numberCLMOD
Product descriptionRS485 to current loop converter. With 6 independent current loop 20mA interfaces.
Configuration softwareNot required
Warranty2 years
Interfaces and functions
Meter interfaces6 independent current loop interfaces (20mA)
interface capacity5 meters per interface (where voltage drop per meter <2VDC)
Total metersup to 30 (6×5 meters)
Interface protectionEvery current loop interface has embedded independent protection circuit
Max pule discharge currentup to 10kA (8/20 µs)
Reaction time>=1µs
Cut off current > 200mA
Max input voltage33V
Interface and communication
RS485 interfaceANSI/TIA/EIA-485-A-1998
Communication protocolsProtocol agnostic (transparent) tested with:
– Modbus RTU;
– IEC 62056-21;
– IEC 62056-31.
Baudrate300 – 19200 baud
ParityNone, Even, Odd
Terminating resistors120 Ohm (configurable)
Current loop interface6 independent interfaces
Galvanic isolation>3kV individual isolation each interface
Max distance<2 km per interface
Max metersup to 5 meters per interface
Protection on every current loop interface independent
Power supply
Auxiliary power supply9-33VDC (full range)
Power consumption40mA @ 12VDC, 20mA @ 24 VDC
Insulation voltage3 kV
Operating conditions
Operating temperature-40°C … 55°C
Storage temperature-40°C … 85°C
Relative humiditymax. 95 % (non condensing)
Protection classIP20
Dimensions and installation instructions
Case height x width x depth119 x 17.5 x 101 mm
Installation typeDIN Rail mounting


Coming soon


CLMOD6 – 6x current loop interfaces for meter with RS485 interface for communication device.

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