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CAN Gateways Introduction

CAN bridges and CAN gateways are infrastructure components with which complex structures can be implemented.

CAN bridges can connect CAN networks of different bit rates or protocols with each other. They are based on the store-(modify)-forward principle, where CAN messages are received by a subnetwork and then transmitted in the other sub-network.

Translation and filter rules can also be used, by means of which, for example, a protocol adaptation can be carried out between the sub-networks. A bridge can therefore also provide simple gateway functions.

Compared to the CAN repeater, the CANbridge enables the enlargement of the maximum network size, so that the sub-systems work fully self-sufficiently with regard to bus arbitration. CAN sub-networks connected by bridges are independent of each other in terms of their real-time behavior and are to be regarded as independent networks.

CAN-bridges are suited to creating hierarchical networks by transferring only the information to the connected sub-network via bridges which are relevant for the sub-network. The bridge function can be executed with the aid of other transmission systems. For example, the CAN-Ethernet-CAN bridge is connected via two Ethernet-TCP/IP gateways which enalbe connection to remote CAN networks.

As an extension to the CAN bridges, CAN gateways enable access to CAN networks via other communication systems. The protocols of the connected bus systems are mapped in the other communication model in each case.

In this way, for example, devices with only one serial port can be connected to CAN/CANopen networks via CAN/CANopen-RS232 gateways. Gateways can also provide remote accesses to CAN networks. The CAN-TCP/IP gateway, for example, thus enables worldwide access to the CAN network, e.g. for aiagnosis and service purposes.

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