At the technical level, NB-IoT technology is the core driving force for the development of the mobile Internet of Things industry. Major operators rolled up their sleeves and worked hard. As a new generation of cellular IoT standard led by operators, NB-IoT has advantages in coverage, power consumption, security and other aspects, and can meet 90% of application scenarios. Module sans fil Wi-Fi With the freezing of 3GPP standards in 2016, with the support of national policies, the three operators plan to basically complete the coverage of NB-IoT in 2017, leading the world in speed. The full deployment of NB-IoT will also drive the upstream chip communication module and downstream platform/application market, driving the upgrading and innovation of the entire industry.
NB-IoT's inherent characteristics such as low power consumption, strong penetrating power, and large capacity can be called "a perfect match" for the application scenario of shared bicycles. The lower power consumption can ensure that the bicycle can be unlocked smoothly without charging for 2-3 years; Modem sans fil LoRa the strong penetrating power allows users to remember and track the location of the bicycle in real time even in places with poor signals such as corridors and basements, and can unlock it; large-capacity connection It can avoid the phenomenon of signal drop. For example, mobile phones often have no signal in densely populated areas such as Beijing Wudaokou and Shanghai Lujiazui, but this situation will not occur with NB-IoT smart locks. In short, several major features guarantee the smooth and reliable application of shared bicycles.
L'utilisation d'E/S distantes peut non seulement réduire la réduction du signal, mais également économiser l'investissement en équipement et les coûts de câblage. Le capteur recueille le signal et convertit diverses grandeurs (température, humidité, etc.) en accord ModBus, formant ainsi une unité dans l'accord. Habituellement, le module d'acquisition à distance du port série convertit généralement 4mA ~ 20mA (DC) en protocole Module ZIGBEE ModBus RTU, et le module d'acquisition à distance Ethernet convertit généralement 4mA ~ 20mA (DC) en protocole ModBus TCP. Dans le système de contrôle industriel, le périphérique IO collecte les données collectées par le capteur et les convertit dans le protocole ModBus, de sorte que les données peuvent être transmises sur une longue distance via un port série ou une interface Ethernet. Les appareils Ethernet peuvent être directement connectés à des commutateurs ou des routeurs pour former directement un réseau local, de sor...
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