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Vehicle RS485 cascade communication method for rail traffic

A technology of rail transit and communication method, applied in the field of vehicle RS485 cascade communication, can solve the problems of high cost, high complexity, unreliable cascade and so on

Active Publication Date: 2019-12-17
ANNAX SUZHOU RAIL SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first method adopts hardware cascading, which has high complexity and high cost
The second method uses Ethernet or CAN cascading, because of the characteristics of Ethernet, it has high software complexity and high hardware cost
But sometimes there will be two column heads or tails to be cascaded at the same time, this method will fail
[0004] How to ensure that each time two trains send a cascade request at the same time and can cascade successfully, if the cascade request cycle is the same, it will cause data collision, resulting in unreliable cascade

Method used

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  • Vehicle RS485 cascade communication method for rail traffic
  • Vehicle RS485 cascade communication method for rail traffic
  • Vehicle RS485 cascade communication method for rail traffic

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Embodiment Construction

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0027] Such as figure 1 and figure 2 As shown, a vehicle RS485 cascading communication method used in rail transit, according to the unique global product serial number of each train main control CPU chip, a group of RS485 cascading request cycles are obtained after processing, and the cascading cycles of this group have the same rate It should be as low as possible and the query period should be as short as possible. The specific design method includes the following steps:

[0028] Step 1) Extract the unique global product serial number of the main control CPU chip of the train. The main control CPU chip of a regular train has a unique global product serial number. According to the information provided by the main control CPU chip of the train, the unique global product serial number can be read manually or automatically by softwa...

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Abstract

The invention relates to a vehicle RS485 cascade communication method for rail traffic. The method includes the following steps that 1) the unique global product serial number of a train master control CPU chip is extracted, the regular train master control CPU chip has the unique global product serial number, and the unique global product serial number can be manually input or automatically readby software based on information provided by the train master control CPU chip; 2) the CRC positive and negative check values are calculated, the CRC check values are calculated according to the unique global product serial number of the train master control CPU chip, CRC8 checking is adopted, CRC negative calculation is added, and the positive CRC8-P value and the negative CRC8-N value of the train master control CPU chip are obtained; and 3) the positive CRC8-P value and the negative CRC8-N value of the train master control CPU chip are combined to construct an RS485 cascade request cycle. By means of the method, when two trains are cascaded, the heads and the tails of the trains do not need to be distinguished, cascading at will can be achieved, cascading is fast and reliable, cascadingas fast as 70 ms can be successful, and the cascading success rate within 6 S can reach 99.9985%.

Description

technical field [0001] The invention relates to the technical field of rail traffic broadcasting, in particular to a vehicle RS485 cascade communication method for rail traffic. Background technique [0002] Rail transit has become very popular in big cities. According to operational and rescue needs, cascade marshalling of two trains often occurs. There are requirements for the cascading function of the vehicles. After the vehicles are cascaded, the train broadcast and train display of the two trains must still work normally. [0003] Currently, there are multiple cascading methods for rail transit broadcasting cascading functions. The first method adopts hardware cascading, which has high complexity and high cost. The second method uses Ethernet or CAN cascading, because of the characteristics of Ethernet, it has high software complexity and high hardware cost. The third method is RS485 cascading. Compared with the above two methods, RS485 has simple hardware, high vers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B61L15/00G06F13/38H04L1/00
CPCB61L15/0018G06F13/385H04L1/0061
Inventor 马克财魏巍张明祥
Owner ANNAX SUZHOU RAIL SYST