Two years ago, Apple released the HomeKit smart home platform. Google bought the smart home brand Nest for $3.2 billion, and Samsung included SmartTings. As the giant entered the layout early, the wind seemed to be on the rise.
Two years later, the smart home that experienced the hardware death tide was slightly deserted by the capital winter marketing. Despite this, according to IT Orange's data, there are still 26 companies that have received different rounds of investment this year. Especially in the past few days, Ou Ruibo got a RMB 140 million B round of financing, which inspired the entire smart home industry .
Not only did the startups start to re-energize, but domestic big companies have no slow pace in the layout of smart homes. Huawei, Xiaomi, 360 and so on have deployed smart home strategies at different levels. All this seems to indicate that smart homes are once again hot. .
Time has passed, communication technology as one of the basic technologies of smart home, what is the situation now?
In smart homes, cable technology and wireless technology have their own advantages, depending on the customer's situation: If the customer is not bad, and wants to fully install smart home, then the cable is undoubtedly a better choice, before the renovation, the smart home manufacturers, and The decoration company will do a comprehensive renovation plan together.
Smart home wired (bus) technology
Fieldbus
Fieldbus technology is a new thing that has flourished in the past ten years. It shows its strong vitality in practical engineering applications. The control network will develop along the field bus. Fieldbus technology will also be the core of control network technology. Each field control unit has the capability of digital processing and two-way high-speed communication, decentralized control, large network scale and high quality stability.
RS-485 bus
The network characteristics use differential voltage transmission; generally use bus-type network structure, the number of bus nodes is limited, when using standard 485 transceiver, the maximum number of nodes in a single channel is 32, the transmission distance is close (about 1.2km), the transmission rate Low (300 ~ 9.6 kbps); poor transmission reliability, low cost for a single node, easy to design, easy to implement, low maintenance costs.
CEBus bus
CEBus (ConsumerElectronicsBus) is a communication and product and operational standard developed by the Electronic Industries Association (EIA) for consumer electronics. It is the five types of media used for communication between home appliances (power line, wireless frequency, infrared). Transmission standard for signals in twisted pair and coaxial cable. The signal transmission rate and system capacity are 10 kbps and 4G, respectively.
APBus bus
The APBus bus is currently the only bus technology with China's independent intellectual property rights. It is a family-oriented, fully distributed intelligent control network technology similar to LonWorks technology. The product has two-way communication capabilities as well as interoperability and interchangeability, and its control components can be programmed. The signal transmission rate and system capacity are the same as CEBus, which are 10kbps and 4G respectively.
CAN bus
CANA (ControllerAreaNetwork), a peer-to-peer fieldbus network that supports distributed control and real-time control. Its network characteristics use differential voltage transmission; the number of bus nodes is limited. When using standard CAN transceivers, the maximum number of nodes in a single channel is 110, its transmission rate ranges from 5 kbps to 1 Mbps, and the transmission medium can be twisted pair and fiber. Etc., the transmission distance between any two nodes can reach 10km. Among several existing fieldbus methods, there is a high performance-price ratio.
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