CN103106416A - Low-frequency magnetic transmission communication reader for liquid and tag for the same - Google Patents
Low-frequency magnetic transmission communication reader for liquid and tag for the same Download PDFInfo
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- CN103106416A CN103106416A CN2011103574926A CN201110357492A CN103106416A CN 103106416 A CN103106416 A CN 103106416A CN 2011103574926 A CN2011103574926 A CN 2011103574926A CN 201110357492 A CN201110357492 A CN 201110357492A CN 103106416 A CN103106416 A CN 103106416A
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Abstract
The invention provides a low-frequency magnetic transmission communication reader for liquid. The reader comprises a first master control module used for controlling reading or writing of tag information, a first encoding module used for encoding requesting information, a frequency mixing module used for generating modulation request signals, at least one reader antenna used for sending the modulation request signals to a tag in an inductive coupling mode and for receiving tag modulation signals in an inductive coupling mode, a first power amplifier module used for driving the reader antenna, and a first antenna matching module used for carrying out impedance matching on at least one reader antenna under the control of the first master control module. The invention further provides a low-frequency magnetic transmission communication tag for liquid. The inductive coupling mode is adopted for signal transmission, and the mode of signal transmission is mainly magnetic transmission. Data communication between the reader and the tag is realized by utilizing the characteristic that magnetic signal transmission is not separated by liquid.
Description
Technical field
The present invention relates to the wireless information collection technical field, particularly a kind of read write line and label of the low-frequency magnetic transport communication for liquid.
Background technology
The Modern Information based management expectancy carries out automatic acquisition and processing to information.Automatic (wireless) acquisition technique of information is mainly to utilize the RFID technology to carry out the transmission of information at present.The RFID radio-frequency (RF) identification is a kind of contactless automatic identification technology, automatically identifies destination object and obtains related data by radiofrequency signal, and identification work need not manual intervention, can work in various rugged surroundings.The RFID technology can be identified high-speed moving object and can identify simultaneously a plurality of labels, and is swift and convenient to operate.
Rfid system is comprised of following three parts usually:
Label (Tag): be comprised of coupling element and chip, each label has unique electronic code, is attached to and identifies destination object on object;
Read write line (Reader): read the equipment of (or writing) label information, can be designed to hand-held or fixed;
Antenna (Antenna): transmit radiofrequency signal between label and read write line.
The principle of work of RFID is that read write line sends out the radiofrequency signal of certain frequency by antenna, when label enter magnetic field (radio-frequency field) thus the time produce induction current and obtain energy, send out the information such as self coding read by read write line and decode after deliver to application system and carry out relevant processing.
The RFID technology can be divided into according to the principle of work of its electronic tag: passive RFID system and active RFID system.The label of passive RFID system does not have internal power supply, and the label internal integrated circuit drives by the electromagnetic wave that receives the read write line transmission.When label received the signal of sufficient intensity, the data that can read the ID of self or be stored in internal storage sent to read write line.The passive RFID system cost is lower.Active RFID system is compared with passive RFID system, and its label inside has power supply, can initiatively send the signal of a certain frequency.The active RFID system long transmission distance.
Due to the absorption of liquid to radiowave, traditional rfid system is the high frequency rfid system particularly, is difficult to carry out data through liquid and reads.Even at the higher environment of water cut, comprise human body, all can produce a very large impact reading of RFID.Compare with solid article, RFID reads accuracy rate under liquid environment reduces more than 20% at least.On reading the tray that liquid article is housed during container information, can only read the container around tray, due to the radio wave reflection or be absorbed, middle container can't correctly read.
Traditional RFID mainly carries out reading under liquid environment in the following ways:
(1) electronic tag is attached at the surface of liquid package, the RFID insulator that will have the material of complex permeability, or use separately or use with the dielectric insulator combination of materials, be inserted between the surface of RFID electronic tag circuit and liquid package, have different dielectric coefficients by making between electronic tag and liquid package surface, thereby reduce liquid, radiowave is affected.
(2) affect with the off resonance that causes of communicating by letter between the RFID tag read-write equipment by improving the Antenna Design of electronic tag, reduce when existing such as the such material of metal, liquid and human body owing to starting the RFID label.
(3) by adopting the low frequency passive label, utilize the wavelength of low frequency radio wave longer, the little characteristic of liquid body impact makes read write line to carry out the identification of label and to read.
But there is respectively following problem in above-mentioned three kinds of modes:
First kind of way and the second way have significant limitation.Particularly, electronic tag can only be placed in the surface of liquid package, can't be placed in liquid internal.And can only read at certain angle and direction, can't accomplish omnibearing reading.If electronic tag changes the position, read accuracy rate and can greatly reduce.Electronic tag need to keep clean, and can't be applied to rugged environment.If the electronic tag surface adhesion water or greasy dirt etc., read accuracy rate and also can be affected.
Reading apart from limited of the third mode is generally 10-60 centimetre, and the data that can't be applied to need under liquid environment to grow operating distance read.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency.For this reason, first purpose of the present invention is to provide a kind of read write line of the low-frequency magnetic transport communication for liquid.Second purpose of the present invention is to provide a kind of label of the low-frequency magnetic transport communication for liquid.
For achieving the above object, the embodiment of first aspect present invention proposes a kind of read write line of the low-frequency magnetic transport communication for liquid, comprises the first main control module, is used for controlling reading or writing the information of described label; The first coding module is connected with described the first main control module, is used for according to the instruction of described the first main control module, solicited message being encoded; Frequency mixing module is connected with described the first coding module, is used for the solicited message after described coding and first carrier signal are carried out mixing, generates the modulation request signal; At least one reading and writing device antenna is used for adopting the inductive coupling pattern that described modulation request signal is sent to described label, and adopts the reception of inductive coupling pattern from the tag modulates signal of described label; The first power amplifier module is connected with each reading and writing device antenna, is used for driving described reading and writing device antenna; The first antenna matching module is connected with described the first main control module with described at least one reading and writing device antenna respectively, is used under the control of described the first main control module, described at least one reading and writing device antenna being carried out impedance matching.
Read write line according to the low-frequency magnetic transport communication that is used for liquid of the embodiment of the present invention adopts inductive coupling mode transfer signal.Wherein, the inductive coupling pattern refers to be operated in the magnetic field energy of near field and generation much larger than the electromagnetic wave signal transmission mode of electric field energy.Because the signal frequency of data transmission is lower than 300khz, wavelength is greater than 1km, and the distance of data communication is 10 centimetres-30 meters, is far smaller than its wavelength, so belong to near-field communication, signal transmission form is mainly the magnetic transmission mode.Utilize magnetic signal to transmit the not characteristic of liquid body obstruct, realize the data communication between read write line and label.
The embodiment of second aspect present invention provides a kind of label of the low-frequency magnetic transport communication for liquid, comprising: power supply is used for to described tag-powered; At least one label antenna be used for adopting the reception of inductive coupling pattern from the modulation request signal of described reading and writing device antenna, and the inductive coupling pattern will send to described reading and writing device antenna corresponding to the tag modulates signal of described modulation request signal; The second antenna matching module is connected with described at least one label antenna, is used for described at least one label antenna is carried out impedance matching; Demodulation module is used for the described modulation request signal that described label antenna receives is reduced to the digital request signal; The application code matching module is connected with described demodulation module, is used for described digital signal is carried out the application code coupling, generates the code stream of coupling; The second main control module, be connected with described application code matching module, be used for code stream by described coupling according to the sample digital signal of serial of default sample frequency, and the digital signal of described serial carried out data process to obtain response message corresponding to described digital request signal; The second coding module is connected with described the second main control module, is used for described response message is encoded; Modulation module is connected with described the second coding module, is used for the response message after described coding and the second carrier signal being carried out mixing, the generating labels modulation signal; The second power amplifier module is connected with described modulation module with described at least one label antenna respectively, is used for driving described label antenna.
Label according to the low-frequency magnetic transport communication that is used for liquid of the embodiment of the present invention adopts inductive coupling mode transfer signal.Wherein, the inductive coupling pattern refers to be operated in the magnetic field energy of near field and generation much larger than the electromagnetic wave signal transmission mode of electric field energy.Because the signal frequency of data transmission is lower than 300khz, wavelength is greater than 1km, and the distance of data communication is 10 centimetres-30 meters, is far smaller than its wavelength, so belong to near-field communication, signal transmission form is mainly the magnetic transmission mode.Utilize magnetic signal to transmit the not characteristic of liquid body obstruct, realize the data communication between read write line and label.
The aspect that the present invention adds and advantage part in the following description provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or the additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein:
Fig. 1 is the schematic diagram according to the read write line of the low-frequency magnetic transport communication that is used for liquid of the embodiment of the present invention;
Fig. 2 is the schematic diagram according to the label of the low-frequency magnetic transport communication that is used for liquid of the embodiment of the present invention.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
Below with reference to the read write line 100 of Fig. 1 description according to the low-frequency magnetic transport communication that is used for liquid of the embodiment of the present invention.
Read write line 100 comprises communication control module 1, the first main control module 2, the first coding module 3, frequency mixing module 4, at least one reading and writing device antenna 5, the first power amplifier module 6, the first antenna matching module 7, first carrier detection module 8 and anti-collision decoder module 9.
The below is described the function of the modules of read write line 100 respectively.
Communication control module 1 is connected with the first main control module 2, comprises communication controller and various communication interface.Wherein, communication interface comprises RS232 serial line interface RJ45 network interface.And, be reserved with CAN interface and USB interface etc.Communication control module 1 is used for to the first main control module 2 transmission commands, and receives the data message of the first main control module 2 transmission.Thereby satisfy to greatest extent the demand in various situations.
The first main control module 2 is cores of read write line 100, be used for to control the reading or writing of the information of label, and the main reading and writing function that realizes label has realized the functions such as the Auto-matching of antenna and day line options simultaneously.The first main control module 2 can communicate with communication control module 1, receives order, transmission information to communication control module 1.
The first coding module 3 is connected with the first main control module 2, is used for according to the instruction of the first main control module 2, solicited message being encoded.Wherein, the first coding module 3 can be baseband encoder.The first coding module 3 is encoded solicited message according to default communication code form, comprise to solicited message adding frame head, length and check code etc.Then the data after encoding send to frequency mixing module 4.
Frequency mixing module 4 is connected with the first coding module 3, and solicited message and first carrier signal after being used for encoding carry out mixing, generate the modulation request signal, and wherein, the modulation request signal is lower than 350KHz.Particularly, frequency mixing module 4 is carried out mixing with baseband signal and first carrier signal, and baseband signal is modulated on carrier wave, and read write line 100 adopts the AM modulation system that baseband signal is modulated.Wherein depth of modulation is 100%.
Reading and writing device antenna 5 is used for adopting the inductive coupling pattern that the modulation request signal is sent to label, and adopts the reception of inductive coupling pattern from the tag modulates signal of label.The first power amplifier module 6 is connected with each reading and writing device antenna 5, is used for driving reading and writing device antenna 5.Thereby modulation signal with larger power stage, is improved the scope of the identification label of read write line 100.In one embodiment of the invention, the first power amplifier module 6 adopts power MOS pipe, thereby realizes the output of signal power.
The first antenna matching module 7 is connected with the first main control module 2 with at least one reading and writing device antenna 5 respectively, is used under the control of the first main control module 2, at least one reading and writing device antenna 5 being carried out impedance matching.Particularly, the first antenna matching module 7 comprises matching unit 71 and matching control unit 72, and wherein matching unit 71 is connected with reading and writing device antenna 5, is used for that at least one reading and writing device antenna 5 is carried out impedance matching and mates antenna with select target.In order to make the signal of exporting on reading and writing device antenna 5 the strongest, reading and writing device antenna 5 is carried out impedance matching.By selecting different impedance modules, thereby make reading and writing device antenna 5 reach optimum matching, make the signal on reading and writing device antenna 5 the strongest, identification range is maximum.
Matching control unit 72 is connected with the first main control module 2 with matching unit 71 respectively, is used for controlling by gauge tap the impedance matching of reading and writing device antenna 5.Particularly, matching control unit 72 selects different impedance modules and reading and writing device antenna 5 to mate by gauge tap.The first main control module 2 detects best impedance module by signal sampling, thereby realizes the Auto-matching of reading and writing device antenna 5.
In one embodiment of the invention, read write line 100 also comprises first carrier detection module 8 and anti-collision decoder module 9.Wherein, first carrier detection module 8 is connected with reading and writing device antenna 5, and the electromagnetic wave signal that is used for reading and writing device antenna 5 is received filters.At first, then whether first carrier detection module 8 exist by detecting the current detecting carrier wave at first by the unnecessary clutter of frequency-selecting electric current filtering.Can be when the carrier wave arrival being detected by first carrier detection module 8, notice anti-collision decoder module 9 enters decoded state.
Anti-collision decoder module 9 is connected with first carrier detection module 8 with the first main control module 2 respectively, is used for being in harmonious proportion decoding to obtain label data to separating from the tag modulates signal of label under the activation of first carrier detection module 8.Anti-collision decoder module 9 is by amplification, integration, relatively wait circuit that the tag modulates signal that receives is decoded, thereby can be when a large amount of label is arranged, effectively reading tag.
Read write line according to the low-frequency magnetic transport communication that is used for liquid of the embodiment of the present invention adopts inductive coupling mode transfer signal.Wherein, the inductive coupling pattern refers to be operated in the magnetic field energy of near field and generation much larger than the electromagnetic wave signal transmission mode of electric field energy.Because the signal frequency of data transmission is lower than 300khz, wavelength is greater than 1km, and the distance of data communication is 10 centimetres-30 meters, is far smaller than its wavelength, so belong to near-field communication, signal transmission form is mainly the magnetic transmission mode.Utilize magnetic signal to transmit the not characteristic of liquid body obstruct, realize the data communication between read write line and label.The present invention adopts the long wave magnetic signal to communicate, and magnetic signal can be by liquid absorption as electric signal, thereby is applicable to the transport communication under liquid environment.The near field magnetic signal has the fast characteristics that get of signal attenuation simultaneously, has high security, is not easy to be ravesdropping, and is suitable for the data transmission that the security requirement high field is closed.
Below with reference to the label 200 of Fig. 2 description according to the embodiment of the present invention.
As shown in Figure 2, label 200 comprises supply module, at least one label antenna 12, the second antenna matching module 13, demodulation module 14, application code matching module 15, the second main control module 16, the second coding module 17, modulation module 18, the second power amplifier module 19 and the second carrier detection module 20.Wherein, label 20 can be placed in the surface of liquid internal or liquid package.
The below is described the function of the modules of label 200 respectively.
Supply module is used for to label 200 power supplies, thereby makes label can initiatively send the signal of certain frequency.
Each label antenna 12 is used for adopting the reception of inductive coupling pattern from the modulation request signal of reading and writing device antenna 5, and the inductive coupling pattern will send to reading and writing device antenna 5 corresponding to the tag modulates signal of modulation request signal.The second antenna matching module 13 is connected with at least one label antenna 12, is used at least one label antenna 12 is carried out impedance matching, and antenna receiving-sending is changed and the match and regulate of antenna thereby complete.Demodulation module 14 is used for the modulation request signal that label antenna 12 receives is reduced to the digital request signal, and namely being reduced into can be for the decoding baseband signal.
In one embodiment of the invention, the second carrier detection module 20 is connected with demodulation module 14 with the second antenna matching module 13 respectively, and the modulation request signal that is used for 12 receptions of 14 pairs of label antennas of notice demodulation module carries out demodulation so that the modulation request signal is reduced to the digital request signal.Particularly, whether the second carrier detection module 20 mainly forms by differentiating with passage amplification, frequency-selecting amplification and the frequency of automatic gain, at first by the unnecessary clutter of frequency selection circuit filtering, then exist by detecting the current detecting carrier wave.Can be when the carrier wave arrival being detected by the second carrier detection module 20, notice demodulation module 14 enters decoded state.
The second power amplifier module 19 is connected with modulation module 18 with at least one label antenna 12 respectively, is used for driving label antenna 12.
Use matching module 15 and be connected with demodulation module 14, be used for the digital signal that reduction obtains is carried out the code stream that application code mates to generate coupling.Particularly, application code matching module 15 arranges the first interrupt cycle of timer, gather the digital signal of serial in each timed interrupt cycle, the digital signal of serial is shifted successively stores buffer zone into, when the length of the digital signal that collects serial reaches the first preset length, the timeing closing device.
The second main control module 16 is connected with application code matching module 15, is used for code stream by coupling according to the digital signal of default sample frequency sampling serial, and the digital signal of serial is carried out data process to obtain response message corresponding to the digital request signal.Particularly, the second main control module 16 judges whether the header of digital signal of serial is correct, if the header of the digital signal of serial is correct, judges the verification of digital signal of serial and whether correct, otherwise the clear to send sign.If the verification of the digital signal of serial and correct continues to judge whether the identity information of digital signal of serial is correct, otherwise removes described transmission sign.If the identity information of the digital signal of serial is correct, the command field of the digital signal of serial is resolved, otherwise the clear to send sign.In one embodiment of the invention, the identity information of the digital signal of and serial consistent with the identity information in current label when the identity information of the digital signal of serial is during for default identity information value, and the identity information of the digital signal of the second main control module 16 judgement serials is correct.
The command field of the digital signal of 16 pairs of serials of the second main control module is resolved.Wherein, command field comprises search command, Ping order, deactivation command and the order of change identity information.The below describes the function of each order respectively.
Search command: search command is a broadcasting command.When the second main control module 16 receives search command, if label is in inactivated state, do not reply search command and clear to send sign; If label is in state of activation, the identity information of current label is set to response message and is sent to buffer zone, and set sends sign, completes this secondary data and processes.
The Ping order: the Ping order is a point-to-point querying command, reply the ID of current label.When the second main control module 16 received the Ping order, the clear to send sign was so that current label is in state of activation, and the identity information of current label is set to response message and is sent to buffer zone, and set sends sign, completed this secondary data and processed.
Deactivation command: deactivation command is that current label is set to inactivated state.Usually after read write line 100 sends search commands and receives the replying of label, this label is sent deactivation command, thereby search for other labels.When the second main control module 16 received deactivation command, it was inactivated state that current label is set, and the identity information of current label is set to response message and is sent to buffer zone, and set sends sign, completed this secondary data and processed.
The order of change identity information: the order of change identity information is used for arranging the ID of label.When the second main control module 16 received change identity information order, the identity information of the current label of change was sent to buffer zone with the identity information of the current label after change, and set sends sign, completes this secondary data and processes.
The second coding module 17 is connected with the second main control module 16, is used for response message is encoded.Particularly, whether effectively detect the transmission sign, if send sign effectively, the data in buffer zone being carried out data according to default rule processes, and the message after the data processing is encoded, according to default speed, with the corresponding ports that sends to of the message after coding serial successively.
Read write line 100 adopts the reception of inductive coupling pattern from the tag modulates signal of above-mentioned label 200, and wherein, the tag modulates signal is the message after encoding.The tag modulates signal is lower than 350KHz.100 pairs of tag modulates signals of read write line are separated and are in harmonious proportion decoding obtaining label data, and the Adoption Network mode is sent to data processing server with label data.Data processing server carries out aftertreatment to the tag modulates signal from read write line 100.
According to the label of the low-frequency magnetic transport communication that is used for liquid of the embodiment of the present invention, label can be placed in the surface of liquid internal or liquid package, reads thereby can carry out omnibearing data, and is also unaffected even label position changes.Simultaneously, the operating distance of label can get from 10 centimetres to 10 meters scope.And low frequency signal is adopted in data communication.And adopt inductive coupling mode transfer signal.Wherein, the inductive coupling pattern refers to be operated in the magnetic field energy of near field and generation much larger than the electromagnetic wave signal transmission mode of electric field energy.Because the signal frequency of data transmission is lower than 300khz, wavelength is greater than 1km, and the distance of data communication is 10 centimetres-30 meters, is far smaller than its wavelength, so belong to near-field communication, signal transmission form is mainly the magnetic transmission mode.Utilize magnetic signal to transmit the not characteristic of liquid body obstruct, realize the data communication between read write line and label.The present invention adopts the long wave magnetic signal to communicate, and magnetic signal can be by liquid absorption as electric signal, thereby is applicable to the transport communication under liquid environment.The near field magnetic signal has the fast characteristics that get of signal attenuation simultaneously, has high security, is not easy to be ravesdropping, and is suitable for the data transmission that the security requirement high field is closed.
In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is by claims and be equal to and limit.
Claims (13)
1. a read write line that is used for the low-frequency magnetic transport communication of liquid, is characterized in that, comprising:
The first main control module be used for to be controlled reading or writing the information of described label;
The first coding module is connected with described the first main control module, is used for according to the instruction of described the first main control module, solicited message being encoded;
Frequency mixing module is connected with described the first coding module, is used for the solicited message after described coding and first carrier signal are carried out mixing, generates the modulation request signal, and wherein, described modulation request signal is lower than 350KHz;
At least one reading and writing device antenna is used for adopting the inductive coupling pattern that described modulation request signal is sent to described label, and adopts the reception of inductive coupling pattern from the tag modulates signal of described label, and wherein, described tag modulates signal is lower than 350KHz;
The first power amplifier module is connected with each reading and writing device antenna, is used for driving described reading and writing device antenna;
The first antenna matching module is connected with described the first main control module with described at least one reading and writing device antenna respectively, is used under the control of described the first main control module, described at least one reading and writing device antenna being carried out impedance matching.
2. the read write line of the low-frequency magnetic transport communication for liquid as claimed in claim 1, is characterized in that, also comprises:
Communication control module, described communication control module is connected with described the first main control module, described communication control module comprises communication controller and communication interface, is used for to described the first main control module transmission command, receives the data message of described the first main control module transmission.
3. the read write line of the low-frequency magnetic transport communication for liquid as claimed in claim 1, is characterized in that, described the first antenna matching module comprises:
Matching unit, described matching unit is connected with described reading and writing device antenna, carries out impedance matching for the described reading and writing device antenna at least one and mates antenna with select target;
Matching control unit, described matching control unit are connected with described the first main control module with described matching unit respectively, are used for controlling by gauge tap the impedance matching of described reading and writing device antenna.
4. the read write line of the low-frequency magnetic transport communication for liquid as claimed in claim 1, is characterized in that, also comprises:
The first carrier detection module is connected with described reading and writing device antenna, and the electromagnetic wave signal that is used for described reading and writing device antenna is received filters;
The anti-collision decoder module is connected with described first carrier detection module with described the first main control module respectively, is used for being in harmonious proportion decoding to obtain label data to separating from the tag modulates signal of described label under the activation of described first carrier detection module.
5. the read write line of the low-frequency magnetic transport communication for liquid as claimed in claim 1, it is characterized in that, described the first coding module is encoded described request information according to default communication code form, comprise to described request information adding frame head, length and check code.
6. a label that is used for the low-frequency magnetic transport communication of liquid, is characterized in that, comprising:
Power supply is used for to described tag-powered;
At least one label antenna, be used for adopting the reception of inductive coupling pattern from the modulation request signal of described reading and writing device antenna, and the inductive coupling pattern will send to described reading and writing device antenna corresponding to the tag modulates signal of described modulation request signal, wherein, described modulation request signal is lower than 350KHz;
The second antenna matching module is connected with described at least one label antenna, is used for described at least one label antenna is carried out impedance matching;
Demodulation module is used for the described modulation request signal that described label antenna receives is reduced to the digital request signal;
The application code matching module is connected with described demodulation module, is used for described digital signal is carried out the application code coupling, generates the code stream of coupling;
The second main control module, be connected with described application code matching module, be used for code stream by described coupling according to the sample digital signal of serial of default sample frequency, and the digital signal of described serial carried out data process to obtain response message corresponding to described digital request signal;
The second coding module is connected with described the second main control module, is used for described response message is encoded;
Modulation module is connected with described the second coding module, is used for the response message after described coding and the second carrier signal are carried out mixing, and the generating labels modulation signal, wherein, described tag modulates signal is lower than 350KHz;
The second power amplifier module is connected with described modulation module with described at least one label antenna respectively, is used for driving described label antenna.
7. the label of the low-frequency magnetic transport communication for liquid as claimed in claim 6, is characterized in that, also comprises:
The second carrier detection module, described the second carrier detection module is connected with described demodulation module with described the second antenna matching module respectively, is used for notifying described demodulation module to carry out demodulation so that described modulation request signal is reduced to the digital request signal to the described modulation request signal that described label antenna receives.
8. the label of the low-frequency magnetic transport communication for liquid as claimed in claim 6, it is characterized in that, described application code matching module arranges the first interrupt cycle of timer, gather the digital signal of the described serial of serial in each timed interrupt cycle, the digital signal of described serial is shifted successively stores buffer zone into, when the length of the digital signal that collects described serial reaches the first preset length, close described timer.
9. the label of the low-frequency magnetic transport communication for liquid as claimed in claim 6, it is characterized in that, whether the header of the digital signal of described the second described serial of master control module judges is correct, if the header of the digital signal of described serial is correct, judge the verification of digital signal of described serial and whether correct, otherwise the clear to send sign;
If the verification of the digital signal of described serial and correct judges whether the identity information of digital signal of described serial is correct, otherwise removes described transmission sign;
If the identity information of the digital signal of described serial is correct, the command field of the digital signal of described serial is resolved, otherwise remove described transmission sign.
10. the label of the low-frequency magnetic transport communication for liquid as claimed in claim 9, it is characterized in that, the identity information of the digital signal of and described serial consistent with the identity information in current label when the identity information of the digital signal of described serial is during for default identity information value, and the identity information of the digital signal of described the second described serial of master control module judges is correct.
11. the label of the low-frequency magnetic transport communication for liquid as claimed in claim 6 is characterized in that, described command field comprises: search command, Ping order, deactivation command and the order of change identity information, wherein,
When described the second main control module receives described search command, if described label is in inactivated state, do not reply described search command and clear to send sign; If described label is in state of activation, the identity information of current label is set to response message and is sent to buffer zone, the described transmission sign of set;
When described the second main control module receives described Ping order, remove described transmission sign so that current label is in state of activation, the identity information of current label is set to response message and is sent to buffer zone, the described transmission sign of set;
When described the second main control module received described deactivation command, it was inactivated state that current label is set, and the identity information of current label is set to response message and is sent to buffer zone, the described transmission sign of set;
When described the second main control module received described change identity information order, the identity information of the described current label of change was sent to buffer zone, the described transmission sign of set with the identity information of current label after change.
12. the label of the low-frequency magnetic transport communication for liquid as claimed in claim 6, it is characterized in that, whether described the second coding module detects described transmission sign effective, if described transmission sign is effective, the data in described buffer zone being carried out data according to default rule processes, and the message after the data processing is encoded, according to default speed, with the corresponding ports that sends to of the message after coding serial successively.
13. the label of the low-frequency magnetic transport communication for liquid as claimed in claim 6, it is characterized in that, described label arranges the second interrupt cycle of timer, serial sends the message after encoding in each timed interrupt cycle, when the length of the message after the described coding that sends reaches the second preset length, close described timer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103574926A CN103106416A (en) | 2011-11-11 | 2011-11-11 | Low-frequency magnetic transmission communication reader for liquid and tag for the same |
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| CN2011103574926A CN103106416A (en) | 2011-11-11 | 2011-11-11 | Low-frequency magnetic transmission communication reader for liquid and tag for the same |
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| CN (1) | CN103106416A (en) |
Cited By (2)
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| CN115790672A (en) * | 2023-02-06 | 2023-03-14 | 国机传感科技有限公司 | Extremely-low-frequency electromagnetic wave half-duplex magnetic sensing system and method |
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Application publication date: 20130515 |