Weighing system communication method based on digital sensor
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A digital sensor and weighing system technology, applied in the direction of digital transmission system, transmission system, signal transmission system, etc., can solve the problem of forged weighing data, etc., to eliminate inaccuracy, ensure accuracy and reliability, and ensure security and confidentiality Effect
Active Publication Date: 2008-03-12
METTLER TOLEDO CHANGZHOU PRECISION INSTR +2
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However, the weight signal transmission between this fully enclosed digital sensor and the instrument adopts digital communication methods, such as standard digital communication interfaces RS-232, RS485, CAN, etc. These standard communication interfaces have requirements for sending and receiving data formats It is standard, even if a software communication protocol is added on the standard physical layer, it is easy to be cracked by third-party analysis and forged weighing data
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Embodiment 1
[0029] For digital truck scales, the weighing system includes a digital instrument, a digital sensor and a scale body. The digital sensor is connected to the digital instrument through the CAN bus. format to exchange data.
[0030](1) The manufacturer establishes a digital sensor key file for each digital sensor. The digital sensor key file contains a set of 12-byte binary codes, consisting of a 12-digit digital sensor serial number and a set of 12-digit random codes. Generated by operation, the random code is the factory password. For example, the serial number of the digital sensor is: UAFD12345678, and the random code is 987654321012. Then UAFD12345678 is converted into ASCII code and expressed as: 0x35, 0x21, 0x26, 0x24, 0x11, 0x12, 0x13, 0x14, 0x15 , 0x16, 0x17, 0x18; the random code is converted into ASCII code and expressed as: 0x19, 0x18, 0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10, 0x11, 0x12; two sets of data obtained through XOR operation The hexadecimal code is...
Embodiment 2
[0036] The digital truck scale is also used. The weighing system includes a digital instrument, a digital sensor and a scale body. The digital sensor is connected to the digital instrument through the CAN bus. format to exchange data.
[0037] (1) The manufacturer establishes a digital sensor key file for each digital sensor. The digital sensor key file contains a set of 12-byte binary codes, consisting of a 12-digit digital sensor serial number and a set of 12-digit random codes. Generated by operation, the random code is the factory password. For example, the serial number of the digital sensor is: UAFD12345678, and the random code is 987654321012. Then UAFD12345678 is converted into ASCII code and expressed as: 0x35, 0x21, 0x26, 0x24, 0x11, 0x12, 0x13, 0x14, 0x15 , 0x16, 0x17, 0x18; the random code is converted into ASCII code and expressed as: 0x19, 0x18, 0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10, 0x11, 0x12; two sets of data obtained through XOR operation The hexade...
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Abstract
The invention relates to a communication method for weighing system based on digital sensor, which requires files building of a key and its password on release date as well as a key for digital sensor. The process of the said method is that: firstly, the key and its password for the storage system of the weighing instrument are downloaded to the digital sensor, from which the key and its password on release date can be obtained; secondly, the weighing instrument sends the communication orders to the target digital sensor, and the encrypted data packet, encrypted and generated through key files of digital sensor, data flow and system cipher, is sent to the target digital sensor; thirdly, after monitoring and receiving the packet, the target digital sensor will make a deciphering and recovery to obtain the system raw data by system key and key on release date, and then take it as the communication order; fourthly, after receiving the communication order, the target digital sensor will make a data packet of the sampled weights, and the data packet, the key on release date and the system cipher, encrypted and generated as the release encrypted data packet, will be sent to the weighing instrument; lastly, after monitoring and receiving the release encrypted data packet, the weighing instrument will make a encryption to obtain the weight data by system cipher and key on release date. Thus the transmission and communication of weight data is achieved. The invention ensures a security and reliability of the channels for weight data transmission.
Description
technical field [0001] The invention relates to a data encryption communication method of an electronic weighing system, in particular to a communication method of a weighing system based on a digital sensor. Background technique [0002] With the development of technology, electronic weighing systems are widely used in various fields. The electronic weighing system of digital sensors is mainly composed of the following parts: the scale body is the load-bearing mechanism, digital sensors, junction boxes, weighing instruments, etc. The scale body evenly distributes the weight borne by the scale platform to each digital sensor; the digital sensor will The pressure signal under pressure is converted into an electrical signal and sent to the weighing instrument through the communication line after digitization; the junction box realizes the electrical connection between the communication lines of all digital sensors and the communication port of the weighing instrument; the weig...
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