QFA3150/MO Room relative humidity and temperature sensor Modbus RTU (RS-485) Basic Documentation A6V12297475_en--_a 2021-01-20 Smart Infrastructure
Table of Contents 2 | 14 1 About this document .................................................................................3 1.1 1.2 Revision history ...........................................................................................3 Before you start ...........................................................................................3 2 2.1 Product overview .......................................................................................5 Type summary.......................
1 About this document Revision history 1 About this document 1.1 Revision history Edition Date Changes Section a 2021-01 First version. All 1.2 Before you start Copyright This document may be duplicated and distributed only with the expressed permission of Siemens Switzerland Ltd. Quality assurance These documents were prepared with great care. ● The content of all documents is checked at regular intervals. ● All necessary corrections are included in subsequent versions.
1 About this document Before you start ● ● 4 | 14 From your Siemens branch office www.siemens.com/sbt or at your system suppliers. From the support team at headquarters fieldsupport-zug.ch.sbt@siemens.com if no local POC is available. Siemens assumes no liability to the extent allowed under the law for any losses resulting from a failure to comply with the aforementioned points or for the improper compliance of the same.
2 Product overview Type summary 2 Product overview The sensor is used in ventilation and air conditioning plants. 2.1 Type summary Product number SSN no. QFA3150/MO S55720-S535 Measurement parameter Temperature Relative humidity -40…70 °C 0…100 % r.h. Output signal Modbus RTU 2.2 Product documentation Datasheet Mounting instructions A6V12297472 A6V12297460 See the datasheets and mounting instructions for detailed information. You can download the above documents at http://siemens.
3 Wiring 3 Wiring 6 | 14 G Operating voltage AC 24 V ±20 % or DC 13.5...
4 Configurations DIP switch for configuration method selection 4 Configurations 4.1 DIP switch for configuration method selection The sensor is a Modbus RTU (RS-485) slave device. It can be configured with a Modbus master when DIP2-Position 7 is OFF (default setting). The sensor has two sets of DIP switches: DIP1 and DIP2. It can be manually configured with DIP switches when DIP2-Position 7 is ON. For details, see DIP switch configuration [➙ 9]. 4.
4 Configurations Modbus registers 4.3 Modbus registers Holding Register (16-bit) No. Description Range Unit Scaling Default R/W 1 Temperature value -327…327 °C °C 0.01 - R -556.6…620.6 °F °F Temperature reliability 0 – No error - - - R 3 Relative humidity value 0…100 % % 0.
4 Configurations LED colors and patterns 4.4 LED colors and patterns Color Pattern Description Green Constant until device boots Power up Flashing (1 s on / 5 s off) ● Power-up is completed. ● Working properly ● Modbus is configured. Orange Red Flickering Bus communication Flashing (1 s on / 5 s off) Bus communication failure Flashing (1 s on / 1 s off) ● Power-up is completed. ● Working properly ● Modbus is not configured. Flashing (0.
4 Configurations DIP switch configuration The sensor has two sets of DIP switches: DIP1 and DIP2.
Configurations Bus termination 4 NOTE: 1) Parity + Stop bit only support following combinations: 1-8-E-1, 1-8-O-1, 1-8-N-1 and 1-8-N-2. Others will be treated as 1-8-E-1. 4.
5 Maintenance Disposal 5 Maintenance 5.1 Disposal The device is considered an electronic device for disposal in accordance with the European Guidelines and may not be disposed of as domestic garbage. ● Dispose of the device through channels provided for this purpose. ● Comply with all local and currently applicable laws and regulations.
Appendices Cyber security disclaimer 6 6 Appendices 6.1 Cyber security disclaimer Siemens provides a portfolio of products, solutions, systems and services that includes security functions that support the secure operation of plants, systems, machines and networks. In the field of Building Technologies, this includes building automation and control, fire safety, security management as well as physical security systems.
Issued by Siemens Switzerland Ltd Smart Infrastructure Global Headquarters Theilerstrasse 1a CH-6300 Zug +41 58 724 2424 www.siemens.com/buildingtechnologies © Siemens Switzerland Ltd, 2021 Technical specifications and availability subject to change without notice.
