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Data transmission protocol with protocol exception state

A technology of abnormal state and protocol, applied in the direction of digital transmission system, transmission system, data exchange network, etc., can solve the problems of transmission rate limit, destroy different or faster messages, etc., and achieve the effect of reducing consumption

Active Publication Date: 2015-10-21
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the transfer rate can generally be limited by one of the slower users in the network or by its monitoring mechanism
[0017] This limitation is not always necessary especially when data transmissions intended for a different, for example faster, communication protocol are to be carried out between two specific subscribers, and in particular in the case of this different communication protocol It can be disadvantageous when dropping the monitoring mechanism would result in a different or faster message

Method used

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  • Data transmission protocol with protocol exception state
  • Data transmission protocol with protocol exception state
  • Data transmission protocol with protocol exception state

Examples

Experimental program
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example 1

[0035] Example 1: Permissive CAN implementation relative to CAN FD messages

[0036] The following is based on figure 2 and 3 An example of an embodiment of the invention starting from a standard CAN network is shown. exist figure 2 The first users 200 of the network shown in are in this case, for example, control devices which have devices according to the invention, ie as in image 3 There is a communication controller 220 with a modified standard CAN implementation as shown as part of the interface 201 in FIG. The standard CAN implementation is modified in such a way that it implements the method according to the invention. exist figure 2 The second subscribers 250 of the network shown in are here, for example, control devices which have communication controllers with CAN FD implementation.

[0037] Realization refers to the realization of the communication protocol in hardware or in software, ie for example a CAN communication controller or an IP module containing...

example 2

[0049] Example 2: Modified implementation of CAN FD relative to messages according to a further developed protocol

[0050] Refer again below figure 2 and 3 A further example of an embodiment of the invention starting from a CAN FD network is shown. In this case, in figure 2 The first users 200 of the network shown in are for example control devices with devices according to the invention, ie as in image 3 Shown as part of the interface 201 is a communication controller 220 with a modified CAN FD implementation implementing the method according to the invention. exist figure 2 The second subscribers 250 of the network shown in are in this example control devices that have a communication controller that includes an implementation of another communication protocol. This further communication protocol can be, for example, a further development of the CAN FD protocol, which allows even longer data fields than are provided in CAN FD, for example, depending on the content ...

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PUM

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Abstract

1) Method for the interchange of data between subscribers that are connected to one another by means of a bus system, wherein messages that contain the data are interchanged on the basis of a first communication protocol, wherein the messages comprise a sequence of bits, wherein at least one control bit having a prescribed position within the message that is interchanged on the basis of the first communication protocol must have a prescribed value, wherein for each message one subscriber has the role of the sender and at least one other subscriber, as a receiver, receives the message and performs error monitoring for the message, characterized in that the presence of at least one control bit with a value that differs from the prescribed value prompts at least one receiver to adopt a protocol exception state in which it suspends error monitoring until a resumption condition for the use of the first communication protocol is satisfied.

Description

Background technique [0001] The invention proceeds from a method for exchanging data between subscribers, which are interconnected by means of a bus system, wherein messages containing data are exchanged according to a first communication protocol, wherein the messages consist of bit sequences and have At least one control bit at a predetermined position within the messages exchanged by the communication protocol must have a predetermined value, wherein for each message one user assumes the role of sender and at least one other user receives the message as receiver And error monitoring for the message is performed. [0002] Such methods occur, for example, in communication controllers of Controller Area Networks (CAN). This method is described, for example, in the BOSCH CAN specification 2.0 which can be downloaded from the website of Robert Bosch GmbH http: / / www.semiconductors.bosch.de. The bus system in this case is usually a line pair such as a twisted copper cable. The ...

Claims

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Application Information

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IPC IPC(8): H04L12/40H04L29/06G06F11/07
CPCH04L12/4013H04L69/03H04L2012/40215H04L12/40
Inventor F.哈特维希
Owner ROBERT BOSCH GMBH