IOMod 4RTD – industrial 4 temperature sensors module


IOMod 4RTD is a stand-alone Modbus RTU, IEC 60870-5-101, and IEC60870-5-103 temperature sensor device. Designed to measure indoor thermal statistics over a wide temperature range with high accuracy and repeatability even after frequent heating and cooling cycles. Equipped with 4 temperature measuring channels to enable temperature reading with default configuration.

IOMod 4RTD is an ideal solution for such applications as data acquisition, observation, process monitoring, testing, and remote measurement where high precision over a wide temperature range is needed. Further possible applications include plastics processing, microelectronics, textile processing, as well as numerous other.

IOMod 4RTD is Modbus RTU, IEC 60870-5-101, or IEC60870-5-103 protocol compatible and can be connected in parallel with other equipment in a multi-drop installation scheme as in any SCADA system.

When using IOMod 4RTD with WCC Lite gateway, it is possible to monitor temperature (using 4 different sensors) over Ethernet LAN’s or 3G/4G(LTE)/GSM/GPRS networks. It is a powerful solution for remote monitoring and control, alarm management, and data logging of I/O’s on cloud platform.


  • Temperature measurement of 0.5°C accuracy for all operating conditions
  • Temperature sensing range: from -200 to 800 °C using platinum RTD sensors
  • Modbus, IEC60870-5-103, IEC60870-5-101 communication over RS485 physical layer
  • Selectable PT100 or PT1000 temperature RTD sensor and connection type (2, 3 or 4 wires) for each channel
  • Configuration over USB console
  • Drag and Drop firmware upgrade over USB mass storage
  • LED indications for power, USB connection, sensor and temperature fault conditions for all channels
  • Easy connection with WCC Lite gateway and platform


  • Analog inputs: 4 RTD (PT100 / PT1000)
  • PC USB connection: Mini USB
  • Input connectors: Screw terminal plug connector


  • Configuration: Over USB console
  • Firmware upgrade: Over USB mass storage


  • Communication standard: RS485
  • Communication protocol: Modbus RTU, IEC 60870-5-101 and IEC 60870-5-103
  • Speed: 600 – 115200 baud

Electrical Characteristics

  • Termination resistor: Software selectable, 120Ω
  • Power supply: 9-33VDC (full range)
  • Current consumption: 40mA @ 12VDC, 20mA @ 24VDC

Mechanical Characteristics

  • Operating temperature: -40 ÷ +85 °C
  • Humidity: 5-95% RH (non-condensing)
  • Casing: IP20, blend PC/ABS self-extinguishing, black
  • Dimensions: 119 (H) x 17.5 (W) x 101 (L), mm
  • Mounting: DIN rail
  • Warranty: 2 years


Device data
Article numberIOMOD-4RTD
Product Description4 temperature sensor input module
Configuration softwareIOMOD Utility, Serial console (putty)*
Warranty2 years
Measurement values and functions
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
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
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
* 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-4RTD – 4xChannel PT100,PT1000 input module with IEC 60870-5-103, IEC 60870-5-101, or Modbus RTU Slave protocol

On request*:

* – IOMOD devices 8DI8DO, 8AI, 4RTD, 16DI, 8DI4RO, 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.

Contact Us