CN203858627U - Portable RFID (radio frequency identification) equipment - Google Patents
Portable RFID (radio frequency identification) equipment Download PDFInfo
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- CN203858627U CN203858627U CN201320821459.9U CN201320821459U CN203858627U CN 203858627 U CN203858627 U CN 203858627U CN 201320821459 U CN201320821459 U CN 201320821459U CN 203858627 U CN203858627 U CN 203858627U
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Abstract
The utility model relates to portable RFID (radio frequency identification) equipment, which comprises a microprocessor and a plurality of functional modules and also comprises an I2C bus switching switch, wherein the I2C bus switching switch is connected with an I2C bus interface of the microprocessor, is respectively connected with I2C bus interfaces of the functional modules, is controlled by output signals of the microprocessor and enables the I2C bus interfaces of the functional modules to be respectively and electrically connected with the I2C bus interface of the microprocessor. During the implementation, the portable RFID equipment has the following beneficial effects that the portable RFID equipment adopting the connection is simple, the cost is low, and the management or the secondary development is convenient.
Description
Technical field
The utility model relates to field of radio frequency identification, more particularly, relates to a kind of portable RF ID(Radio Frequency Identification, radio-frequency (RF) identification) equipment.
Background technology
I
2c bus is a kind of twin wire universal serial bus of being developed by PHILIPS company, for connecting microprocessor and peripheral apparatus thereof.I
2c bus results from the eighties, is a kind of bus standard that microelectronics Control on Communication field extensively adopts.It is a kind of special shape of synchronous communication, has interface line few, and control mode is simple, and traffic rate is compared with advantages of higher; Each device has a unique Address Recognition, can multiple I
2c interface hanging equipment is loaded in together.
Current contactless RFID recognizing apparatus is widely used in the application of warehousing management, local logistics, herding safety detection.Multiple integrated chips or the circuit modules such as the bar code reader of the contactless portable RF ID of part device interior the is integrated camera of the use of taking pictures, identification one dimension, two-dimensional bar code, temperature sensor, power management module, electric erazable programmable storer; The external communication interface of these integrated chips or circuit module generally is I
2c interface, and the I of needs and microprocessor
2c links together; Work time these integrated chips or circuit module all in from pattern, microprocessor is holotype.These integrated chips or circuit module are distributed in whole system, because cabling is oversize, equipment is too many, electrifying timing sequence is different, the not equal reason of each circuit module interface output impedance, can cause electric signal degradation, I
2c bus antijamming capability weakens, and when outside exists interference, undesired signal often causes I
2c bus is locked, thereby causes the above-mentioned I of use
2the portable RF ID device access that C bus connects is undesired.
Publication number is the one expansion I that the Chinese patent of CN 101324875A proposes
2the method of C bus, prevents I although can play
2the effect that C bus is locked, but in its method, used FPGA or CPLD programmable logic device (PLD), forecast scheme configuration is comparatively complicated, has also increased system power dissipation when having increased device cost, is not too applicable to portable RF ID device systems.Equally, publication number is that the patent of CN 100426274C is at anti-I
2in the locked scheme of C bus, FPGA or CPLD programmable logic device (PLD) are used, the same the problems referred to above that exist.
Although can increase capacitance resistance ware and carry out impedance matching, the electrifying timing sequence of strictly controlling each I2C equipment and power-off sequential and strengthen the antijamming capability of I2C bus in side circuit design on signal transmission pathway, but programmed control sequential is had to strict constraint condition, and circuit static power consumption has increased much, in some secondary development, for the antijamming capability of intensifier circuit, can carry out some constraints to the electrifying timing sequence of various modules, duty; From the personnel of secondary development, because constraint condition is more, cause development difficulty to increase.
In Corporation R & D process, in some product life cycles, need to carry out repeatedly upgrading, and hardware, research and development of software personnel all can produce variation.Along with upgrading adjustment or the product customization of product function, in actual hardware circuit design, I/O I/O mouth all can adjust, and corresponding intelligent operating system bsp driver also needs to do corresponding adjustment.Repeatedly in upgrading customization, relate to numerous I/O I/O mouth adjustment, and be through several distinct program person's maintenance upgrades, be easy to so cause program to produce multiple versions, and incompatible; From the angle of company management, Maintenance Development, all promote difficulty.
Integrated various functional modules and circuit module in current contactless portable RF ID equipment, need to realize keyboard scan function, externally provide I/O I/O mouth function; In operating system software exploitation, relate to the power supply control and management of various built-in modules.Developing each functional development in hardware design and operating system software utilizes independent I/O to design, although feasible in principle, but form scheme existent defect, be embodied in: need to the provide support hardware capability module of I/O read-write of test environment, in the situation that inner integration module is more, required I/O mouth quantity is a lot, and operating system bottom layer driving software development complex operation, constraint condition are more; Because cross reference place in program is more, when distinct program person's exploitation, be easy to omit some place, cause bottom layer driving portability to weaken with secondary development cost higher.
In sum, in the prior art, use this I
2the portable FRID equipment that C bus connects has the defect that complex structure, cost are high, be not easy to management or secondary development.
Utility model content
The technical problems to be solved in the utility model is, high for above-mentioned complexity, the cost of prior art, to be not easy to management or secondary development defect, provide a kind of simple, cost is low, be convenient to a kind of portable RF ID equipment of management or secondary development.
The utility model solves the technical scheme that its technical matters adopts: construct a kind of portable RF ID equipment, multiple functional modules that it comprises microprocessor and receives the data of described microprocessor transmission or send data to described microprocessor, described multiple functional module completes respectively the function of its setting, and described microprocessor and described multiple module include I separately
2c bus interface, also comprises and described microprocessor I
2c bus interface connect and respectively with described multiple functional module I
2that C bus interface connects, be subject to the control of described microprocessor output signal and make the I of described multiple functional modules
2c bus interface respectively with described microprocessor I
2the I of C bus interface electrical connection
2c highway switching.
Further, described I
2c highway switching comprises first port and multiple the second port, and described the first port is connected with described second port of a setting respectively under the effect of control signal.
Further, described microprocessor I
2c bus interface is connected on described the first port, the I of described multiple functional modules
2c bus interface is connected on described second port.
Further, described I
2c highway switching also comprises that the I/O port of setting with described microprocessor is connected, receives the control signal input port of described microprocessor output control signal.
Further, described control signal be the output of described microprocessor two-way independently, represent the digital signal of unlike signal content with its level height.
Further, described I
2c highway switching, according to the combination of described control signal level, makes described the first port be connected with second port of setting in advance.
Further, described microprocessor I
2the I of C bus address and described multiple functional modules
2c bus address is to set in advance.
Further, described microprocessor I
2c bus interface is arranged on holotype, the I of described multiple functional modules
2c bus interface is set to respectively from pattern.
Further, described functional module comprises: I/O IO module, camera control circuit module, bar code head control circuit module 105 and finger-board circuit module.
The second port connection that described the first port is connected with described connecting key plate circuit module is set when further, described microprocessor powers on.
Implement portable RF ID equipment of the present utility model, there is following beneficial effect: due to the I connecting between microprocessor and multiple functional module
2c bus is provided with change-over switch, and this change-over switch under the control of microprocessor at one time or in the time period only by the I of above-mentioned microprocessor
2the I of C bus interface and multiple functional modules
2a connection of C bus interface, this makes above-mentioned I
2c bus can or not disturbed more and locked due to dtr signal; Meanwhile, do not need special CPLD or FPGA as I yet
2the interface unit of C bus.So, use the portable RF ID equipment of above-mentioned connection simple, cost is low, be convenient to management or secondary development.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model portable RF ID apparatus embodiments;
Fig. 2 is the electrical schematic diagram that in described embodiment, microprocessor is connected with multiple functional modules.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described further.
As shown in Figure 1, in the utility model portable RF ID apparatus embodiments, this portable RF ID equipment comprises the data that microprocessor 101 and reception microprocessor 101 send or the multiple functional modules (103,104,105 and 106) that send data to microprocessor 101, multiple functional modules complete respectively the function of its setting, for example, keyboard input, universal input/output signal obtain and transmission, external image obtain with bar code and read in etc.; These functions are that this module itself determines.Certainly, in actual conditions, above-mentioned module can connect one or more, also can connect all.What these functional modules were relevant to the present embodiment is its interface and with being connected of microprocessor 101, as for realizing which kind of function, be that this functional module inner structure determines, little with its interface and the present embodiment relation.Microprocessor 101 and described multiple module (103-106) include I separately
2c bus interface, also comprises the I with microprocessor 101
2c bus interface connect and respectively with the I of multiple functional modules (103-106)
2that C bus interface connects, be subject to microprocessor 101 output signal controls and make the I of multiple functional modules (103-106)
2c bus interface respectively with the I of microprocessor (103-106)
2the I of C bus interface electrical connection
2c highway switching 102.At the present embodiment, above-mentioned functions module comprises: I/O IO module 103, camera control circuit module 104, bar code head control circuit module 105 and finger-board circuit module 106.
In the present embodiment, I
2c highway switching 102 comprises first port (being connected and being labeled as the line connection part of SDA, SCL in Fig. 1 with microprocessor 101) and multiple the second port (being connected part with functional module 103-106 in Fig. 1), and above-mentioned the first port is connected with the second port of a setting respectively under the effect of control signal (being labeled as the signal of A0, A1 in Fig. 1).The I of microprocessor 101
2c bus interface is connected on above-mentioned the first port, and the I of multiple functional module (103-106)
2c bus interface is connected on above-mentioned second port.
In the present embodiment, above-mentioned I
2that C highway switching 102 also comprises is that the I/O port set with microprocessor 101 is connected, receive microprocessor 101 exports the control signal input port (being labeled as A0, A1 line junction in Fig. 1) of control signal.The control signal that microprocessor 101 is exported be two-way independently, represent unlike signal content digital signal, namely common 2 said position digital signals with its level height.These two control signals, according to the difference of its level, can be combined into 4 kinds of codings or situation, and for example, its level can be 00,01,10,11 these 4 kinds of situations, and I
2c highway switching 102, according to the combination of above-mentioned control signal level, makes above-mentioned the first port be connected with second port that set in advance, this level combination correspondence.For example, can set microprocessor 101 electrification reset time, above-mentioned A1, A0 are set to level 00, and the second port corresponding to this level combination is the second port that in Fig. 1, finger-board circuit 106 connects.So microprocessor 101 arranges the second port connection that above-mentioned the first port is connected with connecting key plate circuit module 106 while powering on.That is to say, when microprocessor powers on, the I of microprocessor 101
2c bus interface is to be connected with connecting key plate circuit module 106 bus interface of connecting key plate circuit module 106, and only has connecting key plate circuit module 106 bus interface of this functional module to be connected on microprocessor 101.
In the present embodiment, for to I
2observing of C bus rule, the I of microprocessor 101
2the I of C bus address and described multiple functional module (103-106)
2c bus address is prior I that set and microprocessor 101
2c bus interface is arranged on holotype, and the I of multiple functional module (103-106)
2c bus interface is set to respectively from pattern.
In sum, under peacetime state, work in the I under holotype
2c bus module only and one the most frequently used from pattern I
2c bus module is connected; At the I that need to use other from pattern
2when C bus apparatus, according to I
2any communication of C bus protocol must be all holotype I
2c bus module is initiated, from pattern I
2the feature that C bus module responds subsequently; And the I of contactless portable RF ID device interior
2the I2C bus address of C equipment is all fixed allocation, is to predict in advance, thus can adopt time-multiplexed control mode, by I
2c bus is connected to some from pattern I
2c bus module, other are from the I of pattern
2c bus module is terminated to I
2outside C bus; After communication is complete, holotype I
2c bus module again by the most frequently used from pattern I
2c bus module is mounted to I
2in C bus; Owing to having guaranteed that some moment only have an I who works in from pattern
2c bus module carry, in I2C bus, aspect software systems programming, does not need to consider each I
2electrifying timing sequence between C module and power-off sequential etc. be restriction relation mutually, only need to be by I before communication
2c bus control right obtains, and communication is complete, surrenders I
2c bus control right; Lower greatly each I
2bottom layer driving coupled relation between C bus module.
For this reason, the various functional modules of contactless portable RF ID device interior and circuit module can be divided to classification, be divided into microprocessor, finger-board circuit module, bar code head control circuit module, camera control circuit module, external input/output module, LCD control circuit module, High Speed Serial expansion module etc.; Afterwards, according to each from pattern I
2the feature of the chip interface of C module, becomes I by PORT COM unified definition
2c bus interface; Wherein microprocessor is defined as holotype I
2c bus module, finger-board circuit module, bar code head control circuit module, camera control circuit module, external input/output module are defined as from pattern I
2c bus module; Because finger-board circuit module, bar code head control circuit module, camera control circuit module, external input/output module are all unified for I
2c bus interface, gives different I of each module assignment
2after C bus address, utilize I
2c bus complexing circuit is by holotype I
2c bus module and from pattern I
2c bus module requires to couple together according to the electrical specification of bus design, guarantees the independent between each circuit module.
In operating system bsp driver programming operation, owing to having used I
2c bus communication technology, does not re-use independent I/O and designs, thus do not need again multiple I/O mouths to be operated, and only need be according to the I of each circuit module
2c address operates bus, is easy to accomplish standardization, modularization when bsp driver is write, and a large amount of functions can repeat to call, and is easy to accomplish bsp driver modularization, stratification, and portability increases greatly.Above-mentioned microprocessor is for selectively activating I
2each in C bus is from pattern I
2c bus module, to be activated from pattern I
2c bus module is write data, reading out data, the operation such as duty, reset is set.Microprocessor is all kinds of CPU, MPU system or chip module or the circuit module with logic function.In the present embodiment, above-mentioned I
2c bus complexing circuit refers to the bus converting circuit designing by time division multiplex thinking, can utilize to be similar to PCA9546A or analog switch chip CD4052 designs, and realizes bus switch function.
According to I
2c bus protocol regulation, various I
2c bus interface module can communicate by carry in a bus, therefore be all by bar code head control circuit module, camera control circuit module, LCD control circuit module, externally the direct carry of input/output module is at the I of microprocessor in traditional design
2in C bus, under normal circumstances, modules can normally be worked.But in some applications, need to be by these I
2c turns off from the power supply of pattern device module, at some circuit module inside, I
2the impedance matching resistance of C interface inside is integrated pull-up resistor or bus end, can bring I
2the impedance variation of C bus, in some random moment, this impedance variation can be disturbed the duty of other circuit modules, causes I
2sDA in C bus or SCL are pulled into low level and cannot be restored to high level by some specific factor, according to I
2c bus protocol, I
2c bus is just in the lock state.If sda line is pulled into low level, the I of the microprocessor in holotype by a device in I2C bus
2that C interface just cannot produce is initial, stop signal is carried out next step and transmitted, thereby causes I
2c bus can not realize normal communication.
Although know each from pattern device module real work, the different and mode of operation of electrifying timing sequence is each different, sometimes needs power operation, sometimes needs service operations, these operations can be to I
2the impedance of C bus, level equalization bring certain impact, but after can not cogent provision modules in product design all needing to power on, then carry out I. simultaneously
2c bus read-write operation; Or can not cogent provision modules in the course of the work can not power-off or reset operation, so be necessary to guarantee can only have an I from pattern in some moment
2c bus apparatus module is linked into I
2in C bus, other equipment are all isolated in I
2outside C bus, guarantee I
2c bus impedance and stabilization of level.
In Fig. 1, microprocessor 101 completes I
2addressing and the data read-write operation of C highway switching 102, I/O IO mouth module 103, camera control circuit module 104, bar code head control circuit module 105, finger-board circuit module 106, realize the control to each functional module.Microprocessor 101 is I
2holotype I in C bus
2c bus module is generally CPU processor; I
2c highway switching 102 wants by Address Recognition signal A0, A1 identification microprocessor and which is from pattern I
2c bus module communicates, thereby by I
2c bus clock signal SCL, SDA are switched in corresponding functional module, set up I at microprocessor 101 and I2C between EM equipment module
2the physical link of C bus communication.Address Recognition signal A0, A1 can be the I/O control signals of any two outputs of microprocessor 101, these two Address Recognition signals can be combined into four kinds of " 00 " " 01 " " 10 " " 11 " logic state, correspond to respectively I/O IO module 103, camera control circuit module 104, bar code head control circuit module 105, finger-board circuit module 106, concrete corresponding relation bsp driver can permissive provision, not specific restriction.I/O IO mouth module 103 can be the input/output circuitry module that carries MCU and complete level conversion and driving, can be not also to be with MCU but the I/O sweep circuit that can complete level conversion and driving under microprocessor 101 is controlled.Finger-board circuit module 106 can be the keyboard circuit that carries MCU and complete scan function, can be not also to be with MCU but the keyboard circuit that can complete scan function under microprocessor 101 is controlled.Bar code head control circuit module 105 can be one dimension laser scanning module, can be also the camera circuit module that possesses one dimension, the compatible identification of two-dimensional bar code.Camera control circuit module 104 can be pictures taken or record a video CMOS camera circuit module used.
I
2in C bus, for fear of the confusion of bus signals, the output terminal that requires each device to be connected to bus must be the structure of open circuit output or open collector output.
In the contactless RFID recognizing apparatus course of work, only having finger-board circuit module 106 is to need the frequent circuit module of controlling, I
2c highway switching 102 acquiescences are connected the physical connection between microprocessor 101 and finger-board circuit module 106.In order below to describe conveniently, address selection control signal A0, tetra-kinds of logical combination choice relations of A1 are listed as follows:
| A1 | A0 | I2C bus gating corresponding relation |
| 0 | 0 | Microprocessor 101 is connected with finger-board circuit module 106 |
| 0 | 1 | Microprocessor 101 is connected with I/O IO module 103 |
| 1 | 0 | Microprocessor 101 is connected with camera control circuit module 104 |
| 1 | 1 | Microprocessor 101 is connected with bar code head control circuit module 105 |
As shown in Figure 1, after microprocessor 101 starts, by A0, two different I of address selection control signal control I2C bus signals change-over switch gating of A1
2c bus module; Guarantee like this to only have 1 I in the same moment
2c bus module carry is in bus.
When microprocessor 101 needs control inputs/output IO mouth module 103, by address selection control signal A0 set high, after A1 sets low, just by I/O IO module 103 carries at I
2in C bus; In like manner, by A0 set low, after A1 sets high, camera control circuit module 104 carries are at I
2in C bus; By A0 set high, after A1 sets high, bar code head control circuit module 104 carries are at I
2in C bus; Due to I
2in C bus, microprocessor is I all the time
2main equipment in C bus, and other I
2c equipment is to belong to from equipment all the time, therefore do not need to participate in the I of communication
2c is isolated in I from equipment
2outside C bus, guarantee I
2the security of C bus.
Fig. 2 is the physical circuit figure of change-over switch in Fig. 1, in Fig. 2, and the microprocessor 101 in PXA320 processor corresponding diagram 1, the I2C highway switching 102 in U2 CD4052 chip corresponding diagram 1.
The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (10)
1. a portable RF ID equipment, multiple functional modules that it comprises microprocessor and receives the data of described microprocessor transmission or send data to described microprocessor, described multiple functional module completes respectively the function of its setting, and described microprocessor and described multiple module include I separately
2c bus interface, is characterized in that, also comprises and described microprocessor I
2c bus interface connect and respectively with described multiple functional module I
2that C bus interface connects, be subject to the control of described microprocessor output signal and make the I of described multiple functional modules
2c bus interface respectively with described microprocessor I
2the I of C bus interface electrical connection
2c highway switching.
2. portable RF ID equipment according to claim 1, is characterized in that described I
2c highway switching comprises first port and multiple the second port, and described the first port is connected with described second port of a setting respectively under the effect of control signal.
3. portable RF ID equipment according to claim 2, is characterized in that, described microprocessor I
2c bus interface is connected on described the first port, the I of described multiple functional modules
2c bus interface is connected on described second port.
4. portable RF ID equipment according to claim 3, is characterized in that described I
2c highway switching also comprises that the I/O port of setting with described microprocessor is connected, receives the control signal input port of described microprocessor output control signal.
5. portable RF ID equipment according to claim 4, is characterized in that, described control signal be the output of described microprocessor two-way independently, represent the digital signal of unlike signal content with its level height.
6. portable RF ID equipment according to claim 5, is characterized in that described I
2c highway switching, according to the combination of described control signal level, makes described the first port be connected with second port of setting in advance.
7. portable RF ID equipment according to claim 6, is characterized in that, described microprocessor I
2the I of C bus address and described multiple functional modules
2c bus address is to set in advance.
8. portable RF ID equipment according to claim 7, is characterized in that, described microprocessor I
2c bus interface is arranged on holotype, the I of described multiple functional modules
2c bus interface is set to respectively from pattern.
9. according to the portable RF ID equipment described in claim 2-8 any one, it is characterized in that, described functional module comprises: I/O IO module, camera control circuit module, bar code head control circuit module and finger-board circuit module.
10. portable RF ID equipment according to claim 9, is characterized in that, described microprocessor arranges the second port connection that described the first port is connected with described connecting key plate circuit module while powering on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320821459.9U CN203858627U (en) | 2013-12-13 | 2013-12-13 | Portable RFID (radio frequency identification) equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320821459.9U CN203858627U (en) | 2013-12-13 | 2013-12-13 | Portable RFID (radio frequency identification) equipment |
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| Publication Number | Publication Date |
|---|---|
| CN203858627U true CN203858627U (en) | 2014-10-01 |
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| CN201320821459.9U Expired - Fee Related CN203858627U (en) | 2013-12-13 | 2013-12-13 | Portable RFID (radio frequency identification) equipment |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105955177A (en) * | 2016-05-04 | 2016-09-21 | 深圳市华兴鼎盛科技有限公司 | Radio frequency identification method and system |
| CN108595363A (en) * | 2018-04-28 | 2018-09-28 | 武汉精测电子集团股份有限公司 | A kind of serial communication isolation drive device based on FPGA |
| CN108904976A (en) * | 2018-08-23 | 2018-11-30 | 广州市睿盛医疗器械有限公司 | Drive control circuit and physiotherapy equipment |
| CN110362524A (en) * | 2018-04-11 | 2019-10-22 | 杭州海康威视数字技术股份有限公司 | Timing signal generating method, device, logic card and storage medium |
| CN111045971A (en) * | 2019-12-18 | 2020-04-21 | 大唐半导体科技有限公司 | Control circuit and method for cutting single serial port into multiple 232 serial ports of refueling tax control machine |
| CN114495729A (en) * | 2022-01-26 | 2022-05-13 | 江苏奥斯汀光电科技股份有限公司 | Display system capable of being powered wirelessly and display screen positioning method |
| CN114691573A (en) * | 2020-12-31 | 2022-07-01 | 北京配天技术有限公司 | Hardware identification circuit, method and related equipment |
-
2013
- 2013-12-13 CN CN201320821459.9U patent/CN203858627U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105955177A (en) * | 2016-05-04 | 2016-09-21 | 深圳市华兴鼎盛科技有限公司 | Radio frequency identification method and system |
| CN110362524A (en) * | 2018-04-11 | 2019-10-22 | 杭州海康威视数字技术股份有限公司 | Timing signal generating method, device, logic card and storage medium |
| CN110362524B (en) * | 2018-04-11 | 2021-04-09 | 杭州海康威视数字技术股份有限公司 | Time sequence signal generation method and device, logic circuit board and storage medium |
| CN108595363A (en) * | 2018-04-28 | 2018-09-28 | 武汉精测电子集团股份有限公司 | A kind of serial communication isolation drive device based on FPGA |
| CN108595363B (en) * | 2018-04-28 | 2020-08-04 | 武汉精测电子集团股份有限公司 | Serial communication isolation driving device based on FPGA |
| CN108904976A (en) * | 2018-08-23 | 2018-11-30 | 广州市睿盛医疗器械有限公司 | Drive control circuit and physiotherapy equipment |
| CN111045971A (en) * | 2019-12-18 | 2020-04-21 | 大唐半导体科技有限公司 | Control circuit and method for cutting single serial port into multiple 232 serial ports of refueling tax control machine |
| CN114691573A (en) * | 2020-12-31 | 2022-07-01 | 北京配天技术有限公司 | Hardware identification circuit, method and related equipment |
| CN114495729A (en) * | 2022-01-26 | 2022-05-13 | 江苏奥斯汀光电科技股份有限公司 | Display system capable of being powered wirelessly and display screen positioning method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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