Issue link: https://resources.mouser.com/i/1466700
LIGHT UP YOUR INDUSTRIAL IoT DESIGN 18 Figure 8: Multi-Hop Mesh Networks (Source: ROHM) Figure 7: Wi-SUN FAN Module and Evaluation Board (Under Development) (Source: ROHM) Wi-SUN Field Area Network Unlike conventional star- type systems, multi-hop mesh networks provide full coverage over a wide area by connecting devices utilizing multiple sensor nodes. " " Wi-SUN FAN Features: 1. Supports multi-hop mesh networks Unlike conventional star-type systems, multi-hop mesh networks provide full coverage over a wide area by connecting devices utilizing multiple sensor nodes (Figure 8). The nodes provide a redundant configuration with multiple paths, making it possible to achieve a more secure network that prevents system-wide failures resulting from a single point of failure. This system uses a protocol called RPL (IPv6 Routing Protocol for Low Power and Low Network), an open specification of IETF. RPL autonomously builds mesh networks by automatically discovering nearby devices. The communication path is first determined by calculating the Rank Value, which is the virtual distance to the Border Router, an access point that collects data based on the quality of wireless communication between devices. Communication is then carried out by selecting the route with the smallest Rank Value. Stable system operation is achieved by selecting another route in response to sudden changes in terrain after installation or radio interference. WI-SUN FAN In January 2019 ROHM obtained Wi- SUN FAN certification through a joint development with NISSIN SYSTEMS Co.,Ltd. and the team of Professor Hiroshi Harada at Kyoto University.