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ICP DAS’s Wireless Distress Signal System in Forest Recreation Areas (Taiwan)

The ICP DAS‘s iSOS-100 indoor emergency button transmits the distress signal to the iWSN-200U wireless data concentrator in the 433 MHz wireless radio band. The distress signal is then sent to the WISE-5231 IIoT edge controller through the MDC-711 Modbus data concentrator. When an emergency occurs, the notification function of the WISE-5231 controller will immediately send out a distress signal to improve the safety of tourists in the forest recreation area.


In this case study, the forest recreation area has unique natural landscapes and rich biodiversity that attract many tourists. However, the territory is large, and it is difficult to notify the remote staff immediately when an accident occurs. Therefore, the customer chose to install ICP DAS‘s indoor emergency buttons in public restrooms. The system transmits the distress signal wirelessly, and it is monitored by the management office to ensure that the distress signal can be received immediately and relevant measures can be taken to ensure the safety of tourists.

This case study illustrates the use of the ICP DAS‘s wireless distress signal system in public restrooms in the forest recreation areas.

ICP DAS's Wireless Distress Signal System

The system’s structure is divided into two parts: public restrooms and management rooms. Each public restroom is equipped with one iWSN-200U wireless data concentrator and one MDC-711 Modbus data concentrator, as well as iSOS-100 wireless indoor emergency buttons. The visitor can immediately press the iSOS-100 indoor emergency button in the restroom cubicle in case of an emergency. The distress signal will be transmitted to the iWSN-200U wireless data concentrator in the 433 MHz wireless radio band. The data will be sent via RS-485 (Modbus RTU) communication protocol to the MDC-711 Modbus data concentrator and then to the WISE-5231 IIoT edge controller in the management room via Ethernet (Modbus TCP). The built-in real-time notification sending function of the WISE-5231 controller can send alarm messages immediately. The structure of the system is as follows:

The iSOS-100 indoor emergency button can transmit distress signals within a distance of 50 meters in the 433 MHz wireless radio band. When an emergency occurs, tourists only need to press the emergency button to call for help quickly.

The iWSN-200U series wireless data concentrator supports the 433 MHz wireless radio band, Ethernet, and RS-232/RS-485 communication interface. It can receive and temporarily store up to 31 sets of iWSN wireless signal sensing modules. Modules support the slave station identification code ID of the Modbus RTU/TCP protocol for the device that is sending the signal. In this case, the iWSN-200U wireless data concentrator receives a 433 MHz signal and transmits it to the MDC-711 data concentrator via the RS-485 interface (Modbus RTU).

The MDC series Modbus data concentrator supports Ethernet, RS-232, and RS-485 communication interfaces. It can set up to 250 Modbus RTU commands and support up to 8 Modbus TCP master host connections. As for the four types of data like AI/ AO/DI/DO, each data provides 9600 data registers and can upgrade the equipment using Modbus RTU protocol to use the Modbus TCP protocol for communication. The data, that is read back from different slave devices, will be combined into a continuous address format. The address format allows the host computer to read back the data of multiple slave devices at one time, which can replace the previous polling method and save the time of reading devices.

In this case, the customer wanted to use one WISE-5231 controller to manage 69 iSOS-100 indoor emergency buttons, but one WISE-5231 controller can only connect up to 32 Modbus RTU devices. Therefore, the customer was asked to use one MDC-711 data concentrator to integrate the Modbus data of 69 slave devices into one data and send it to the WISE-5231 controller at the same time.

ICP DAS‘s WISE series IIoT edge controller can support up to 32 Modbus RTU slave modules and 16 Modbus TCP slave modules. It has independent logic control and remote monitoring functions, and can be connected to the web management of the WISE controller through the Ethernet interface to edit the logic of the controller and monitor the I/O channel information connected to the WISE controller in real-time. In addition, the WISE series controller supports SMS/Email/APP instant notification function, and a built-in IF-THEN-ELSE statement, which can send real-time alarm messages when logic rules are established.

In this case, the customer uses the WISE-5231 controller as the central monitoring device of the wireless distress signal system. The customer monitors the signals of the iSOS-100 indoor emergency buttons through the built-in WISE web page. A LINE alarm message will be sent immediately to notify the management personnel when a distress signal is received.


1. The iSOS-100 indoor emergency button realizes emergency information transmission, meets the needs of low energy consumption, wireless communication, and emergency monitoring. All this significantly reduces the time and human resources required to build and maintain the system.

2. iWSN series modules can meet the needs of monitoring equipment power consumption, fault diagnosis, and preventive maintenance. iWSN series modules include wireless data concentrator series and wireless signal sensing module series. In addition to integrating current, temperature, humidity, gas, vibration, and wireless transmission functions, their ultra-low power consumption can be matched with a current transformer for inductive charging. In addition, for a variety of power supply methods, the iWSN series also provides an external DC power supply and a disposable battery to meet different needs.

3. MDC series Modbus data concentrators support CSV file setting configuration, which can be edited in spreadsheet software or plain text files. After editing Modbus RTU commands in CSV and importing the files into the MDC series Modbus data concentrator, users can change the Modbus RTU commands of multiple slave devices simultaneously, making the management of devices more time-efficient.

4. WISE series controllers support Modbus RTU/TCP, SNMP, MQTT, CGI, FTP, and other communication protocols; they also can be combined with various IoT/MIS/MES systems, autonomous control centers, smart factories, energy-saving buildings, and other applications.

5. WISE series controllers can be connected to the cloud IIoT platform or the SCADA system of the central control terminal to provide a complete monitoring system. In addition to transmitting the recovered data to the cloud IIoT platform or the SCADA monitoring of the central control terminal, it can also receive commands from the cloud IIoT platform or instructions issued by SCADA to control slave modules.

ICP DAS's WISE series IIoT edge controller and software IoTstar for the data visualization

The IoTstar is a cloud management software developed by ICP DAS. It can remotely monitor and control IIoT controllers such as the WISE/PMC/PMD series and the I/O modules, devices, and equipment connected to the controllers. To establish a complete IIoT cloud management system, the IoTstar can be installed not only on private cloud platforms in the Windows OS, but also on public cloud platforms such as Microsoft Azure, IBM Bluemix, Google Cloud, or Amazon Web Services. Using the ICP DAS‘s WISE series controllers with IoTstar, in addition to transmitting field-side equipment status data through the WISE controller and storing it in the control room database, the data can also be displayed on the IoTstar dashboard for visualization, which can easily create a real-time monitoring system. Moreover, IoTstar also provides statistical reports and query services for I/O module channel (or power meter) values connected to WISE/PMC/PMD controllers.

For more information about the IoTstar, please follow the link below:


ICP DAS‘s wireless distress signal system uses a 433 MHz low-frequency communication technology to solve the problem of complex field wiring. Management personnel can monitor the status of modules and equipment with the WISE-5231 IIoT edge controller to achieve the purpose of centralized monitoring. With the controller’s built-in notification function, an alarm message can be sent to the management personnel to immediately resolve the emergency.

In this case study, the forest park was advocating a form of “educational ecotourism,” which hopes to provide a safe and beautiful natural landscape that helps tourists gain a deeper understanding of their environment and ecosystem. Therefore, ICP DAS‘s wireless distress signal system helps to create an environmentally friendly tour. ICP DAS develops products for wireless, wired, and remote monitoring, providing customers with solutions for various applications. To meet the unique needs of different industries in the future, ICP DAS will continue to develop suitable products for them.

Related products:

MDC-711 Modbus Data Concentrator
WISE-5231 Intelligent IIoT Edge Controller
iSOS-100 Emergency Distress Button Module
iWSN-200U Data Concentrator
IoTstar - IoT Cloud Management Software

ICP DAS View All

ICP DAS was established in 1993 and strongly focuses on innovation and the enhancement of industrial automation technology. ICP DAS continuously endeavors to develop a comprehensive selection of products ranging from remote I/O controllers, distributed I/O modules, I/O data acquisition boards, programmable automation controllers, industrial communication modules, web-related products, motion control systems, SCADA/HMI software to automation solutions for applications critical to energy management, motion automation, smart factories, intelligent buildings, and smart cities. Our ambition is to provide a wide range of high-quality products and versatile applications, together with prompt and efficient services, that can be implemented to assist in the continued success of our clients worldwide.

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