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Data transmission method in entrance guard system

A data transmission method and access control system technology, which are applied in transmission systems, single input/output port registers, instruments, etc., can solve the problem of easy deviation in verification judgment, high frequency of incorrect data, loss of data transmission, etc. problems, to achieve the effect of improving reception and communication efficiency, reducing error frequency, and reducing coupling

Active Publication Date: 2013-03-27
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The synchronization header of most of the access control communication protocols used in the access control system now uses a single-byte synchronization header 0x7E. In the application of the power industry, the electromagnetic interference caused by the special power environment is more serious than other occasions, and it is easy to cause data transmission. data loss, and bytes such as 0x7E are more common in the network, which makes the verification judgment after data reception prone to deviation, resulting in higher frequency of received error data and lower communication efficiency

Method used

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  • Data transmission method in entrance guard system

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Embodiment Construction

[0019] Example. A data transmission method in an access control system, such as figure 1 shown, proceed as follows:

[0020] (1) The access control host sends the protocol data unit, the composition of the protocol data unit is: a 6-byte synchronization header, a 7-byte protocol exchange information unit for indicating protocol version information and session information, and a source for recording information The 2-byte device address information unit and data unit;

[0021] (2) The host computer verifies the 6-byte synchronization header;

[0022] (3) Receive the protocol exchange information unit, device address information unit and data unit of the protocol data unit after passing the verification;

[0023] (4) After receiving the protocol exchange information unit, the device address information unit and the data unit, verify the device address information unit;

[0024] (5) After the device address information unit is verified as qualified, the data unit is processed...

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Abstract

The invention discloses a data transmission method in an entrance guard system. The method comprises the following steps: an entrance guard host sends a protocol data unit; a computer host verifies a synchronous head of the protocol data unit; when verification is qualified, a protocol exchange information unit, an equipment address information unit and a data unit are received; when reception is finished, the equipment address information unit is verified; when verification of the equipment address information unit is qualified, the data unit is subjected to process, and if the verification is not qualified, the data unit is shielded. According to the invention, electromagnetic anti-interference capability is raised, data loss in a data transmission process is not easy to appear, coupling of data synchronization is reduced, reception of effective data is improved, and a normal synchronization data verification load is ensured.

Description

technical field [0001] The invention relates to a data transmission method, in particular to a data transmission method applied in an access control system. Background technique [0002] In recent years, due to the continuous improvement of the market's requirements for electronic equipment, and the electronic equipment industry is also striving for excellence, and continuously develops various new products with powerful functions, which makes electronic equipment more and more complex. Many electronic equipment are equipped with Communication protocols are used for data transmission. [0003] The synchronization header of most of the access control communication protocols used in the access control system now uses a single-byte synchronization header 0x7E. In the application of the power industry, the electromagnetic interference caused by the special power environment is more serious than other occasions, and it is easy to cause data transmission. The data is lost, and by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06G07C9/00
Inventor 高新华陈炯聪谢善益高雅周伊琳余南华黄曙梁智强
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID