With the development of wireless communication technology, there is an increasing demand for data transmission stability and low power consumption. Compared with the traditional FSK technology, LoRa has a longer transmission distance and strong anti-interference ability under the same power consumption. This also determines the superiority of LoRa in a more complex environment. Therefore, based on the LoRa modulation format, EBITE has developed a security wireless communication network system suitable for smoke and fire alarms and other scenarios, including master-slave gateway (E53-GW(470FMS22R)) and low-power nodes (E53-470FMS22S), and the gateway can access up to 1200 nodes.
Core features
Network construction: The gateway is automatically established when the gateway is powered on, and the node is automatically connected to the network when it is powered on.
Network management: The primary gateway supports network management capabilities. Network status management such as network node registration and deletion;
Communication key: The user can customize the network key, which greatly ensures the security of network communication;
Environmental channel occupancy detection: supports environmental RSSI scanning, and displays it in the form of a legend after the scan is completed, and you can choose a line chart or a bar chart.
Wireless parameter configuration: users can remotely configure or read wireless module parameters by wirelessly sending instruction packets;
Trunk networking: The slave gateway supports automatic relay networking, and multi-level relay is suitable for ultra-long-distance communication, and multiple networks run in the same area at the same time;
Automatic avoidance: Gateways and low-power nodes support automatic channel avoidance, which can greatly improve the stability of data transmission.
Independent heartbeat packet mechanism: supports custom heartbeat packet configuration, and low-power nodes automatically report heartbeat frames periodically, detecting network status in real time, and improving network stability.
Ultra-low power consumption: The node supports deep sleep, and the power consumption of the whole machine in this mode is about 2uA.
Exception handling mechanism: Efficient watchdog design, once the module is abnormal, the module will automatically restart, and can continue to work according to the previous parameter settings;
Companion GUI: Graphical configuration tools are used to quickly configure and manage the entire network.
System logic
1. Networking process
(1) After the node is initialized after power-on, the network access request frame is automatically initiated with random delay, and the active channel is detected before the RF data is sent, and the automatic avoidance and retransmission mechanism is adopted.
(2) The gateway receives the network access request frame data and responds to the node to confirm whether the node has been registered to the gateway, and the gateway will only allow the registered node to join the network;
(3) The node receives the gateway to answer the network access request and starts to synchronize the clock, frequency information, and network access status;
(4) Finally, the heartbeat packet time synchronization is completed, and the node automatically wakes up and reports the heartbeat according to the heartbeat packet cycle, as follows:
FMS wireless long-distance intelligent networking node access process
2. Node gateway uplink and downlink data flow
(1) There are three types of node uplink messages: Heartbeat, Alarm, and custom data reporting;
(2) Heartbeat is a heartbeat message, and the node periodically wakes up and sends heartbeat frames according to the heartbeat cycle;
(3) The alarm signal triggers the button through the node to simulate the fire signal, and the node will wake up immediately and periodically report the alarm information, and send out an alarm sound through the buzzer. When the GUI receives the alarm signal, the corresponding node will display the alarm message;
(4) Customized data reporting design, which can report data through specific AT command formats to further expand user scenarios. The flowchart is as follows:
Based on the data communication process of sub-G FMS wireless long-distance intelligent networking
Based on the Sub-G FMS wireless long-distance intelligent networking technology gateway and low-power node, as a low-power LoRa star networking product, it can be widely used in smart home, smart medical, home audio-visual, conference system, photo studio, theater, education and other industries to solve the actual needs of smart lighting control, sockets, switches, security and other fields. With the rapid development of the wireless industry, the demand for wireless communication technology in smart cities will become increasingly urgent, and the proportion of this networking product in the market will gradually increase.
E53-GW(470FMS22R) Star Networking FMS Gateway-Equipment Monitoring System Gateway-Yibaite LoRa DTU Gateway