iSMA-B-LP Modbus User Manual

Introduction

The iSMA-B-LP is a wall panel with 2.3” LCD display and four function buttons. Additionally, the panel has a built-in temperature sensor and, optionally, humidity and CO₂ sensors.

The iSMA-B-LP is powered with 24 V AC/DC and has a built-in RS485 port (Modbus RTU/ASCII and BACnet MS/TP). The use of open communication protocol allows to connect the panel with any controller, which supports Modbus RTU/ASCII or BACnet MS/TP. Connected to the iSMA controllers, the panel allows to change the basic parameters such as: temperature setpoint, fan speed, FCU mode, and other. Thanks to a built-in USB port, there is a possibility of updating firmware and configurating the panel without the need of power supply. The iSMA-B-LP has modern design and is available in different colors (white is basic), on client’s request.

This user manual outlines Modbus registers available in the iSMA-B-LP room panel and describes their configuration.

LP panels

Revision History

Date	Rev.	Description
30 Jan 2025	1.5	Corrections in the technical specification table Sensors's filters default value corrected Updated DEVICE_CONFIGURATION register description OFFSET_RANGE limit values corrected Updated description of time displaying
25 May 2022	1.4	Rebranded
16 Nov 2017	1.3	Added new version of the panel (iSMA-B-LP(-XX)-1)
6 Jun 2017	1.2	Added information about BACnet MS/TP protocol
21 Feb 2017	1.1	New function: Added SubmenuIconDisplayOFF bit in DeviceConfiguration register to disable displaying of submenu icons; Changes in document: Added SubmenuIconDisplayOFF bit description in DeviceConfiguration section Added description of Submenu Boolean All Present Value registers
20 Apr 2017	1.0	First edition

Revision history

This user manual outlines Modbus registers available in the iSMA-B-LP room panel and describes their configuration.