CAN communication is generally bus-like, as is the RS-485 network. Bus-based network communication has drawbacks: it can only be a straight line or curve, cannot be split, and cannot be closed in a ring shape. Fork routing problems can be solved by adding HUB.
This article describes how to realize ring network communication of 3 CAN nodes through CAN HUB.
First introduce the HUB (hub) that implements the extension function of CAN: HUB4CAN. This is a hub that extends one CAN out of four CANs, optically isolated, and supports all CAN protocols without setting. One end is a CAN and power supply terminal, and the other is a 4-way CAN expansion. This usage is similar to our commonly used USB HUB.
In the following cases, there are three CAN controllers (or CAN nodes) that require communication between each two CAN controllers. This cannot be achieved in a conventional bus CAN network. Now connect each CAN controller to a HUB4CAN. Pay attention to the direction of the product. One side is CAN and the other side is 4 CAN. We only use any two of the four extended CAN ports.
Since there are only 3 CAN controllers in the entire ring network, each 2 CAN controllers can communicate directly without going through another controller. For example, the controller 3 and the controller 2 communicate with each other through the above straight line connection without passing through the controller 1 . Similarly, the controller 3 and the controller 1 are directly connected through the left arc, and the controller 1 and the controller 2 are directly connected through the right arc.
The 4-node CAN ring network implemented by HUB is shown below.
As for the CAN ring network communication with more than 4 nodes, we will continue to introduce it in future articles.
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