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Tyrrell Products

I/O module with Modbus RTU/ASCII or BACnet MSTP communication- 8UI

I/O module with Modbus RTU/ASCII or BACnet MSTP communication- 8UI

Regular price £142.93
Regular price Sale price £142.93
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  • 8 Universal Inputs
  • RS-485 Serial connection
  • Supports Modbus ASCII/Modbus RTU/BACNet MSTP


The iSMA-B-8U module features 8xUI (Universal Inputs) capable of operating in 5 distinct modes: temperature, voltage, current, resistance, and dry contact.

Additionally, this module comes pre-equipped with two widely used open communication protocols, namely Modbus ASCII/RTU and BACnet MSTP, which can be selected using DIP switches.

Addressing the modules is accomplished via rotary switches, streamlining and expediting the system commissioning process.

Moreover, the module includes a built-in mini USB port, enabling initial configuration without the need for an external power supply.


8x Universal Inputs (8UI)

All universal inputs have 16-bit resolution which support the following types of inputs:

  • Temperature input support the following types of sensors: 10K3A1, 10K4A1, Carel 10K, 20K6A1, 2.2K3A1, 3K3A1, 30K6A1, SIE1, TAC1, SAT1, Pt1000, Ni1000
  • For sensor Pt1000 and Ni1000 use only 16bit resolution
  • Voltage input 0-10 V DC: input resistance 100 kΩ accuracy ±0,1% measurement resolution 3 mV @ 12bit and 1 mV @ 16bit
  • Current input 0-20 mA
  • Resistive input 0-1000 kΩ: measurement resolution for 20 kΩ load 20 Ω @ 12bit and 1 Ω @ 16bit
  • Dry contact input


  • Cortex-M3

Power supply

  • 24 V AC/DC


  • Interface RS485 half duplex
  • Up to 99 devices on the bus
  • Protocols: Modbus or BACnet
  • Baud rate: 2400 to 115200 bps


  • Dimension: 37x110x62 mm (1.457 x4.331×2.441 in)
  • Construction: plastic, self-extinguishing (PC/ABS)
  • DIN rail mounting (DIN EN 50022 norm)
  • Cooling: internal air circulation


  • Operating temperature: -10°C to 50°C (14°F to 122°F)
  • Storage temperature: -40°C to 85°C (-40°F to 185°F)
  • Relative humidity: 5 to 95%, no condensation
  • Ingress Protection Rating: IP40 – for indoor installation


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