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The iSMA-B-LP is a wall panel   with a 2.3” LCD display and four function buttons. In addition, the panel has a built-in temperature sensor and optional humidity and CO2 sensors.
The iSMA-B-LP can be operated from a 24 V AC/DC power supply and has a built-in RS485 port (Modbus RTU/ASCII, BACnet MSTP). The open communication protocol allows the panel to be connected to any controller that supports Modbus RTU/ASCII or BACnet MSTP communication.
Together with the iSMA-B-FCU controller, the panel allows you to change basic parameters: temperature setpoint, fan speed, FCU mode and others. Thanks to the built-in USB port, it is possible to maintain the configuration of the panel without power supply.
The iSMA-B-LP has a modern appearance and is available in two different colors according to the customer's request, as well as two versions for the appearance of the button icons.

Main features:

  • 2.3" LCD display with backlight

  • 4 function keys

  • Built-in temperature, optional CO2 and humidity sensor

  • Modbus RTU/ASCII

  • BACnet MSTP

  • More than 100 freely configurable variables

  • Option to display current time



Temperature sensor

  • Type: 10k NTC

  • Range: 0 - 50°C (32°F - 122°F)

  • Accuracy: +/- 0.5°C (0.9°F)

  • Resolution: +/- 0.1°C (0.18°F)

Humidity sensor

  • Range: 0-100% RH

  • Accuracy: +/- 2% RH  20 – 80% RH

  • Resolution: +/- 1% RH

CO2 sensor

  • Infrared absorption measurement principle (NDIR), gold-plated optics, diffusion sampling (with Telaire's patented ABC logic self-calibrated algorithm)

  • Range: 400 – 2000 ppm

  • Accuracy: +/- 30 ppm or 
    the reading is +/- 3%-a 

  • Stability: < 2% error during sensor lifetime (15 years typical)

  • Warm-up time: < 2 minutes (operational); 10 minutes (maximum accuracy)

  • Calibration: ABC Logical Algorithm

  • Manual Calibration Interval: Not required

Supply voltage

  • 24 V AC/DC ± 20%



  • RS485 interface half duplex

  • 2 RJ12 connectors

  • Up to 128 devices on the bus

  • Protocols: Modbus RTU/ ASCII or BACnet MS/TP

  • Baud rate: from 2400 to 115200 bps


  • ARM Cortex-M

Appliance house

  • Dimensions (WxDxD) 100 x 123 x 27 mm 

  • Material plastic, self-extinguishing (ABS)

  • Surface mountable design

Environmental parameters

  • Operating temperature: 0°C - 50°C

  • Storage temperature: -40°C - 85°C

  • Relative humidity: from 5% to 95%, non-condensing

  • IP protection: IP20 - for indoor use

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