CN205302494U

CN205302494U - Data information acquisition and protection circuit in POS machine

Info

Publication number: CN205302494U
Application number: CN201521044253.5U
Authority: CN
Inventors: 李耐私
Original assignee: Liaoning Tongyin Muyuan Network Financial Services Co Ltd
Current assignee: Liaoning Tongyin Muyuan Network Financial Services Co Ltd
Priority date: 2015-12-15
Filing date: 2015-12-15
Publication date: 2016-06-08
Anticipated expiration: 2025-12-15

Abstract

The utility model relates to a data information acquisition and protection circuit in POS machine, have fail safe nature can, can make storing management information firm and stable, guarantee that important data can not lose under the circumstances of falling electricity etc. And other external disturbance. Including data information acquisition and protection circuit, data information acquisition and protection circuit connection are between POS host computer and receipt printer, data information acquisition and protection circuit include signal conditioning unit, communication unit, memory cell, microcontroller and power supply unit, and the signal conditioning unit includes that signal buffer module, photoelectric isolation module, signal latch the module, it is consecutive that signal buffer module, photoelectric isolation module, signal latch the module, and the signal latchs the output connection microcontroller's of module signal input part, memory cell includes SRAM module and FRAM module, and the SRAM module is microcontroller's outside extension storage module, and the FRAM module is indisputable electrical storage, communication unit, power supply unit link to each other with microcontroller respectively.

Description

Data information acquisition and protection circuit in a kind of POS

Technical field

This utility model belongs to POS data message resist technology field, particularly relates to data information acquisition and protection circuit in a kind of POS.

Background technology

Along with the continuous renewal of the development of modern commerce and management technique, the application of POS is fast development therewith also; POS (PointofSale) originates from the end of the seventies in last century, is referred to as " POS system ", and this is the product that modern commerce growth requirement develops rapidly with science and technology; POS is applied to retail business the earliest, but because of its characteristic easily and efficiently, have been used for each side of life now, current POS is widely used to the retail business of large and medium-sized supermarket, chain store, hypermarket, large and medium-sized restaurant and all good managements, food and restaurant service industry or even the place such as large hospital, colleges and universities, be one of the nucleus equipment in contemporary business operating.

POS mode classification has multiple, can include handheld POS machine, desk-top POS, cell phone POS three class by the classification of POS type; Fixing POS, wireless POS machine can be included by the classification of POS communication modes; Temperature-sensitive POS, stylus printer POS can be included by the classification of POS printing type, overlap and beat POS; The multiple mode classification of finance class POS, non-financial type of financial class POS etc. can be included by POS purpose classification. But classifying in any case, the composition of these POS generally mainly includes that main frame, display screen, shop be aobvious, keyboard, bill printer, cash box, bar code reading device, card-brushing groove etc.

Along with the large-scale use of POS, safety collection and administrative protection to its communication information also become important all the more; POS is a kind of point-of-sale terminal with clearing of account function, is read the holder's magnetic strip information on bank card by card reader, and has holder to input personally identifiable information's (i.e. password) to complete on-line transaction;Data safety criterion (DSS) according to international payment card industry (PCI) and the domestic BCTC safety requirements to finance device, when being traded by POS, it is necessary to the data message of some keys in process of exchange is carried out safeguard protection; The data message of described key is that each is sold by POS cashing machine and the record of gathering data is added up, and all sales check can be become to client by the slip printer prints of POS; Because relating to the online consumption of bank card, its security performance there is significantly high requirement, it is necessary to the significant data inside guarantee POS can not be lost, safeguard protection.

Summary of the invention

This utility model is aiming at the problems referred to above, makes up the deficiencies in the prior art, it is provided that data information acquisition and protection circuit in a kind of POS; This utility model not only has a safe and reliable performance, and can make data information memory firmly with stable, it is ensured that significant data can not be lost when power down etc. and other external interference.

For realizing above-mentioned purpose of the present utility model, this utility model adopts the following technical scheme that.

Data information acquisition and protection circuit in this utility model one POS, including data information acquisition and protection circuit, described data information acquisition and protection are electrically connected between POS main frame and bill printer; Its structural feature is: described data information acquisition includes signal condition unit, communication unit, memory element, microcontroller and power supply unit with protection circuit, described signal condition unit includes signal damping module, photoelectric isolation module, signal latch module, described signal damping module, photoelectric isolation module, signal latch module are sequentially connected, and the outfan of described signal latch module connects the signal input part of microcontroller; Described memory element includes SRAM module and FRAM module, and described SRAM module is the outside extension storage module of microcontroller, and described FRAM module is ferroelectric memory; Described communication unit, power supply unit are connected with microcontroller respectively.

As a kind of preferred version of the present utility model, described signal damping module is connected to form by first two-way No. eight buffers and second two-way No. eight buffers, and described first two-way No. eight buffers and second two-way No. eight buffers have DIR, A1��A8, GND, VCC ,/OE, B1��B8 totally 20 pins; The A1 pin of described first two-way No. eight buffers is connected in series 4.7K �� resistance by holding wire and 100 �� resistance are connected with A1��A8 pin of described second two-way No. eight buffers respectively; Wherein, DIR is connected with VCC pin, and/OE is connected with GND pin.

Further, described first two-way No. eight buffers and second two-way No. eight buffers all adopt 74HC245.

As another kind of preferred version of the present utility model, described photoelectric isolation module adopts 3 pins of high-speed photoelectric coupler 6N137, described 6N137 to connect the outfan of signal damping module, 2 pins connect resistance R_F, the 6 of described 6N137, be parallel with electric capacity C respectively between 7 pins_F, resistance R_L, 6 pins of described 6N137 connect signal latch module.

As another kind of preferred version of the present utility model, described signal latch module adopts 74HC573 address latch.

As another kind of preferred version of the present utility model, described microcontroller adopts ATmega128A single-chip microcomputer.

As another kind of preferred version of the present utility model, described SRAM module adopts CY62256 static RAM chip.

As another kind of preferred version of the present utility model, described FRAM module adopts FM24C64 ferroelectric memory.

The beneficial effects of the utility model.

Data information acquisition and protection circuit in a kind of POS that this utility model provides, described data information acquisition includes signal condition unit, communication unit, memory element, microcontroller and power supply unit with protection circuit; First two-way No. eight buffers that wherein signal condition unit adopts and the CY62256 static RAM chip that second two-way No. eight buffer 74HC245, high-speed photoelectric coupler 6N137, address latch 74HC573 and memory element adopt, FM24C64 ferroelectric memory, can make POS that data message firmly and is stably preserved, ensure that significant data can not be lost when power down etc. and other external interference, there are safety and reliability.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, this utility model is described further. This utility model protection domain is not only limited to the statement of herein below.

Fig. 1 is the link position schematic diagram of this utility model data information acquisition and protection circuit.

Fig. 2 is that this utility model data information acquisition is connected framework figure with the concrete composition of protection circuit.

Fig. 3 is the circuit connection diagram of this utility model signal damping module.

Fig. 4 is the circuit connection diagram of this utility model photoelectric isolation module.

Fig. 5 is the circuit connection diagram of this utility model communication unit.

Labelling in figure: 1 be POS main frame, 2 be data information acquisition and protection circuit, 3 for bill printer.

Detailed description of the invention

Shown in attached Fig. 1 and 2, data information acquisition and protection circuit in this utility model one POS, including data information acquisition and protection circuit, described data information acquisition and protection are electrically connected between POS main frame and bill printer; Its structural feature is: described data information acquisition includes signal condition unit, communication unit, memory element, microcontroller and power supply unit with protection circuit, described signal condition unit includes signal damping module, photoelectric isolation module, signal latch module, described signal damping module, photoelectric isolation module, signal latch module are sequentially connected, and the outfan of described signal latch module connects the signal input part of microcontroller; Described memory element includes SRAM module and FRAM module, and described SRAM module is the outside extension storage module of microcontroller, and described FRAM module is ferroelectric memory; Described communication unit, power supply unit are connected with microcontroller respectively.

As it is shown on figure 3, be the circuit connection diagram of this utility model signal damping module; In figure, described signal damping module is connected to form by first two-way No. eight buffers and second two-way No. eight buffers, and described first two-way No. eight buffers and second two-way No. eight buffers have DIR, A1��A8, GND, VCC ,/OE, B1��B8 totally 20 pins; The A1 pin of described first two-way No. eight buffers is connected in series 4.7K �� resistance by holding wire and 100 �� resistance are connected with A1��A8 pin of described second two-way No. eight buffers respectively; Wherein, DIR is connected with VCC pin, and/OE is connected with GND pin.

As shown in Figure 4, for the circuit connection diagram of this utility model photoelectric isolation module; In figure, described photoelectric isolation module adopts 3 pins of high-speed photoelectric coupler 6N137, described 6N137 to connect the outfan of signal damping module, 2 pins connect resistance R_F, the 6 of described 6N137, be parallel with electric capacity C respectively between 7 pins_F, resistance R_L, 6 pins of described 6N137 connect signal latch module.

Described microcontroller adopts ATmega128A single-chip microcomputer; Described signal latch module adopts 74HC573 address latch.

Described SRAM module adopts CY62256 static RAM chip; Described CY62256 static RAM chip has 15bit address wire and 8bit data wire, and capacity is 32KB, disclosure satisfy that the storage of mass data information as this practical outside extension storage module. Described FRAM module adopts FM24C64 ferroelectric memory; The capacity of described FM24C64 ferroelectric memory is 64kbit, can bear the erasable operation of a TFlops, is effectively ensured data power down and does not lose; Therefore, the protection data message that the SRAM module of described memory element and FRAM module can be safe and reliable.

As it is shown in figure 5, be the circuit connection diagram of this utility model communication unit; Described communication unit is RS-485 telecommunication circuit, and circuit includes MAX485 chip and the three high-speed photoelectric coupler 6N137 chips being connected with MAX485 chip; Described three high-speed photoelectric coupler 6N137 chips play buffer action, play stabilized communication effect.

Above content is further description this utility model made in conjunction with concrete preferred implementation; it cannot be assumed that of the present utility model being embodied as is confined to these explanations; for this utility model person of an ordinary skill in the technical field; without departing from the concept of the premise utility; some simple deduction or replace can also be made, all should be considered as belonging to the protection domain that the submitted claims of this utility model are determined.

Claims

1. data information acquisition and a protection circuit in POS, including data information acquisition and protection circuit, described data information acquisition and protection are electrically connected between POS main frame and bill printer; It is characterized in that: described data information acquisition includes signal condition unit, communication unit, memory element, microcontroller and power supply unit with protection circuit, described signal condition unit includes signal damping module, photoelectric isolation module, signal latch module, described signal damping module, photoelectric isolation module, signal latch module are sequentially connected, and the outfan of described signal latch module connects the signal input part of microcontroller; Described memory element includes SRAM module and FRAM module, and described SRAM module is the outside extension storage module of microcontroller, and described FRAM module is ferroelectric memory; Described communication unit, power supply unit are connected with microcontroller respectively.

2. data information acquisition and protection circuit in a kind of POS according to claim 1, it is characterized in that: described signal damping module is connected to form by first two-way No. eight buffers and second two-way No. eight buffers, described first two-way No. eight buffers and second two-way No. eight buffers have DIR, A1��A8, GND, VCC ,/OE, B1��B8 totally 20 pins; The A1 pin of described first two-way No. eight buffers is connected in series 4.7K �� resistance by holding wire and 100 �� resistance are connected with A1��A8 pin of described second two-way No. eight buffers respectively; Wherein, DIR is connected with VCC pin, and/OE is connected with GND pin.

3. data information acquisition and protection circuit in a kind of POS according to claim 2, it is characterised in that: described first two-way No. eight buffers and second two-way No. eight buffers all adopt 74HC245.

4. data information acquisition and protection circuit in a kind of POS according to claim 1; it is characterized in that: described photoelectric isolation module adopts 3 pins of high-speed photoelectric coupler 6N137, described 6N137 to connect the outfan of signal damping module, 2 pins connect resistance R_F, the 6 of described 6N137, be parallel with electric capacity C respectively between 7 pins_F, resistance R_L, 6 pins of described 6N137 connect signal latch module.

5. data information acquisition and protection circuit in a kind of POS according to claim 1, it is characterised in that: described signal latch module adopts 74HC573 address latch.

6. data information acquisition and protection circuit in a kind of POS according to claim 1, it is characterised in that: described microcontroller adopts ATmega128A single-chip microcomputer.

7. data information acquisition and protection circuit in a kind of POS according to claim 1, it is characterised in that: described SRAM module adopts CY62256 static RAM chip.

8. data information acquisition and protection circuit in a kind of POS according to claim 1, it is characterised in that: described FRAM module adopts FM24C64 ferroelectric memory.