CAN – Ethernet Gateway
2
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SYS TEC electronic GmbH 2007 L-1032e_9
For communication between the CAN-Ethernet Gateways a BTP/IP-
based network protocol (BTP = Block Transfer Protocol) is used. This
enables the CAN messages to be routed over the Ethernet with
minimal delay time. The TCP/IP protocol time for establishing and
ending a network connection is thereby eliminated.
As an option, the CAN messages can also be transferred using a
TCP/IP network protocol.
The Gateway firmware is designed for high data throughput. The
optimized buffer management requires minimal resources for copying
and temporarily storing data. Transmission rate spikes that may occur
in the CAN network will be easily handled. If a large amount of data
is transmitted, multiple CAN messages are combined in one UDP or
TCP package and transmitted as a single block.
The CAN-Ethernet Gateway identifies errors and sends CAN
messages (error messages) that contain the reason for the error. The
error message's CAN identifier is configurable (
refer to section 6.3
).
1.2
Application Fields
1.2.1
Connecting Two CAN Networks over Ethernet
A typical application is the connection of two CAN networks via
Ethernet over a great distance. A CAN-Ethernet Gateway is present in
each CAN network. CAN messages are transferred transparently
between the CAN-Ethernet Gateways.
The firmware of the CAN-Ethernet Gateway allows for filtration of
the CAN messages to be sent on, thus only the relevant data gets
transmitted over the Ethernet.
The principle possibilities for building a network structure using
CAN-Ethernet Gateways are represented in
Figure 1.
Summary of Contents for GW-003
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