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T HE O R Y OF O P E R A TI O N

One of two things will happen when Nodes 1 and 2 receive the RREQ from Node 0:

•If a route is known or if they are the destination radio, they can send a Route Reply (RREP) back to Node 0.

•If they do not know the route and are also not the destination radio, they will rebroadcast the RREQ to their neighbors. The message keeps re-broadcasting until the lifespan (specified by the source radio) expires.

If Node 0 does not receive a reply within a set amount of time, it will rebroadcast the message, this time with a longer lifespan and a new ID number.

In the example, Node 1 does not have a route to Node 3 and therefore rebroadcasts the RREQ (see Figure 6: "ZigBee Route Reply" on page 18). Node 2 however, does have a route to Node 3 and therefore replies to the RREQ by sending out a RREP. Node 2 also sends a RREP to Node 3 so that it knows the route to Node 0.

F i g u r e 6 : Z i g B e e R o u t e R e p l y

C o o r d i n a t o r A d d r e s s i n g

Since the Coordinator’s NWK address is always 0x0000, it can be addressed using its 16-bit NWK address.

B r o a d c a s t T r a n s m i s s i o n s

Since ZigBee is targeted for large-scale applications in which all radios may not be in range of a single radio, broadcast packets are retransmitted throughout the network. Broadcast transmissions in ZigBee utilize a passive acknowledgement mechanism; meaning that the Coordinator and all Routers keep track of whether or not their neighbor(s) have relayed the broadcast packet and will re-broadcast the packet until all of their neighboring devices have received the packet. Any device can initiate a Broadcast transmission by programming its Destination Address with a Broadcast Address (see Table 4 on page 19). Subsequent broadcast transmissions occur every 500ms.

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AeroComm ZB2430 manual O a d c a s t T r a n s m i s s i o n s
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ZB2430 specifications

The AeroComm ZB2430 is a highly regarded wireless module optimized for Zigbee applications, positioning itself as an ideal solution for connecting devices within the Internet of Things (IoT) ecosystem. With its robust features, advanced technologies, and impressive characteristics, the ZB2430 stands out in the crowded market of low-power, low-data-rate communication devices.

One of the primary features of the AeroComm ZB2430 is its superior range and reliability. Designed to operate in the 2.4 GHz ISM band, the ZB2430 boasts a communication range of up to 1,200 feet line of sight in open environments. This enables seamless connectivity for devices across extensive areas, making it suitable for applications such as remote monitoring and smart home systems. The ZB2430 also employs advanced error correction and data packet acknowledgment techniques, ensuring that data is transmitted accurately and reliably, even in challenging conditions.

Another significant characteristic of the ZB2430 is its low power consumption. Designed for energy efficiency, this module allows devices to operate on battery power for extended periods, which is critical for applications like sensor networks and portable devices. With power-saving modes that can further extend battery life, the ZB2430 is ideal for applications where minimizing energy use is essential.

The ZB2430 also supports a variety of communication protocols, including point-to-point and mesh networking capabilities. The mesh networking feature allows devices to communicate with each other even when they are not within direct range, creating a highly scalable and resilient network. This is particularly beneficial in industrial automation and smart city applications, where reliable communication is paramount.

In terms of integration, the AeroComm ZB2430 is designed with ease of use in mind. It comes in a small form factor that can be easily incorporated into various devices, and it features a simple interface for developers. With its comprehensive documentation and support, developers can quickly implement and deploy Zigbee solutions.

In summary, the AeroComm ZB2430 is a powerful wireless module that excels in providing reliable, low-power, and scalable communication solutions for IoT applications. Its impressive range, energy efficiency, and support for mesh networking make it an attractive choice for developers looking to create innovative and robust wireless systems. Whether in home automation, industrial control, or smart city initiatives, the ZB2430 is poised to play a key role in the future of connected devices.
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