IOMod HT – temperature and humidity sensor


IOMod HT is a stand-alone Modbus (RTU), IEC 60870-5-103 and IEC 60870-5-101 wall-mounted temperature and humidity sensor device. Designed to measure indoor room or cabinet temperature and humidity with high accuracy, IOMod HT can be used for numerous applications where a user requires temperature and humidity monitoring. IOMod HT also can be used as thermostat that controls relay outputs according to user configuration on humidity and temperature limits.

IOMod HT is an ideal solution for such applications as data acquisition, observation, control, process monitoring, testing and remote measurement. It is controlled over Modbus RTU, IEC 60870-5-103 or IEC 60870-5-101 protocol, and can be connected in parallel with other Modbus RTU, IEC 60870-5-103 or IEC 60870-5-101 equipment in a multi-drop installation scheme as in any SCADA system or monitoring platform.

When using IOMod HT with WCC Lite gateway it is possible to monitor temperature, humidity, relay status, also control relays and their settings 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 in 0.1°C resolution
  • Humidity measurement in 0.1% resolution
  • Modbus, IEC-60870-5-103 and IEC-60870-5-101 communication over RS485
  • 2 normally open relay outputs (advanced version)
  • Automatically configurable relay switching on temperature or humidity change
  • Configuration over USB console
  • Drag and Drop firmware upgrade over USB mass storage
  • LED indication for input/output and data transmission
  • Spring contact connectors
  • Easy connection with WCC Lite gateway and platform


  • Relay outputs: 0 (Basic), 2 (Advanced)
  • PC USB connection: Mini USB
  • Output connectors: Spring contact connectors


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

Electrical characteristics

  • Termination resistor: Software selectable, 120Ω
  • Power supply:
    • Nominal: 12-24VDC, 8mA (basic), 24VDC, 25mA (advanced)
    • Full range: 5-33VDC (basic), 18-27VDC (advanced)
  • Relays: 2 (normally open, advanced)

Relay Output Characteristics (Advanced):

  • Resistive load (cosϕ=1): 5 A at 250 VAC, 5 A at 30 VDC
  • Inductive load (cosϕ=0.4, L/R=7ms): 2 A at 250 VAC, 2 A at 30 VDC
  • Max. switching power: 1,250 VA, 150 W


Device data
Article numberIOMOD-HT (basic and advanced)
Product DescriptionWall-mounted temperature and humidity sensor device
Configuration softwareIOMOD Utility, Serial console (putty)*
Warranty2 years
Measurement values and functions
Temperature measurement range+5 .. +60°C
Temperature measurement resolution0.1°C
Humidity measurement range20 .. 80%RH;
Humidity measurement resolution0.1%
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
Relay outputs (in advanced version only)2 SPNO
Max. switching power1,250 VA, 150 W
Resistive load (cosφ=1)5 A at 250 VAC, 5 A at 30 VDC
Inductive load (cosφ=0.4, L/R=7ms)2 A at 250 VAC, 2 A at 30 VDC
Power supply
Auxiliary power supply5-33VDC (full range in basic version)
18-27VDC (full range in advanced version)
Power consumption16mA @ 12VDC, 8mA @ 24 VDC (basic version)
50mA @ 12VDC, 25mA @ 24 VDC (advanced version)
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 depth26 x 71 x 71 mm
Installation typeWall 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-HT – Wall-mounted temperature and humidity sensor module with IEC 60870-5-103, IEC 60870-5-101, or Modbus RTU Slave protocol

IOMOD-HT-ADVANCED – Wall-mounted temperature and humidity sensor module with 2 relay outputs 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.

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