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Fig. 10 | EURASIP Journal on Embedded Systems

Fig. 10

From: Optimizing linear routing in the ToLHnet protocol to improve performance over long RS-485 buses

Fig. 10

Performance of the ToLHnet protocol for different cable lengths. The previous figure showed that ToLHnet performance is nearly independent of node density. Here, its sensitivity to total cable length is verified. The three plots below illustrate the average raw performance of the ToLHnet protocol operating on three different lengths of RS-485 cable, as a function of the distance between the nodes involved in the communication and for different choices of the baud rate. Inter-node distance is assumed to be uniformly distributed up to a maximum of 5 m. As a reference, both the theoretical limit and the performance of traditional RS-485 bus communication (which depends only on total cable length and not on communicating node distance and is impossible at 10 km) are shown. Colored thin dashed lines represent the performance of the ToLHnet protocol limited to follow tree branches, while thick solid lines represent the performance attainable with the proposed extension to the routing strategy that also allows direct communication between neighboring nodes

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