Wireless meter reading system for residential water and electricity meters
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1. System overview:
1. Install a SL2436a module in each household (the simplified function of the SL2436B module can be used when the transmission distance is required to be very long, we use SL2436b), each SL2436a module has its own number, which can be burned by the manufacturer before leaving the factory. The unchangeable 4-byte (4 billion) unique number made in the chip can also be a number compiled by the user. The SL2436a module is connected to the water and electricity meter through the TTL level; the module can be powered by a 3V battery or other DC power supply (requires the power supply wave coefficient <10 mV---the test method is static test); the existing module includes an antenna and The size of the plastic package is generally 30 x 52 x 5mm, which can be adjusted as needed. The external power cord and data line of the module are connected to the three meters.
2. In the area of the community, according to needs and specific conditions, set up a number of data collection centers for water and electricity meters. The collection modules are composed of SL2436B modules. They can be equipped with RS485 or RS232 interfaces or GPRS forwarding modules as needed. They are responsible for communicating with The SL2436a or SL2436b module in a certain area performs data communication, including collecting data such as the degree of the water and electricity meter connected to the SL2436a/SL2436b module, and issuing instructions to control the work of the water and electricity meter; the SL2436B module is easy to install and waterproof encapsulated The size of the shell is 140 x 112 x 70mm. The size of the antenna can be selected according to the needs. It is recommended to use a small pigtail antenna of 100 mm that matches the existing waterproof housing. If necessary, 480mm x 20 mm and 1200mm x 32mm can also be used. Rod antenna, and 120 x 240 x 40mm plate antenna. Their installation position is more flexible, they can be pressed on the outer wall of the building, opposite to the building that needs to be collected, and can also be installed on the residential lighting pole or on the roof. Each collection point is responsible for collecting data from dozens to hundreds or even thousands of water and electricity meters. The specific number of collections depends on the building environment and specific conditions of the community.
3. Connect these data collection centers wirelessly or wiredly to form a local area network, and connect to the charging center through GPRS or the Internet.
4. According to the different methods of water and electricity meter data collection, for example, general civil water and electricity meters may be collected monthly, while industrial meters may need to be collected at any time. SL2436a/SL2436b is in a periodic working state, such as waking up every second or every minute Once (the specific work cycle can be set according to specific needs), the moment you wake up, wait for the wake-up signal to be received. If the wake-up signal is received, SL2436a/SL2436b will establish wireless communication with the network node SL2436B, and within a short time After completing the data acquisition and the transmission of control commands, if no wake-up signal is received, the module will continue to be in a periodic sleep state.
5. In order to avoid collisions and perform data transmission more effectively, before each SL2436a/SL2436b sends data to the SL2436B data acquisition module, it will first monitor the channel it uses to ensure that no other SL2436a modules use it, otherwise it will be delayed by one Send in a short time to avoid collision; at the same time, after SL2436a/SL2436b is awakened, it will send the signal with different pre-arranged delays according to its own ID number.
6. Using the SL2436B data acquisition module, the data from all SL2436a/SL2436b within its jurisdiction will be collected according to the pre-set time period, packaged, and transmitted to the monitoring center in the following ways:
A. In each SL2436B, install a GPRS or CDMA1X terminal module, and use the mobile communication network to transmit it to the management billing center, or other designated locations;
B. Use the wireless data transfer function of the SL2436B module to collect all the data collected by the SL2436B to a certain collection node, and then transmit it to the management and billing center through other wired or wireless networks, including the Internet, broadband network or mobile network ; Individual data collection points with inconvenient networking can be directly transmitted using a GPRS or CDMA1X terminal module alone.
C. Use the 485 bus to connect all the SL2436B collection points in a community together, and then transmit them to the management billing center through other wired or wireless networks, including the Internet, broadband network or mobile network.
2. Product Picture:
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