CN2155050Y

CN2155050Y - Contact switching answering device

Info

Publication number: CN2155050Y
Application number: CN 93211909
Authority: CN
Inventors: 王世杰
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-05-06
Filing date: 1993-05-06
Publication date: 1994-02-02
Anticipated expiration: 2003-05-06

Abstract

The utility model provides a contact switching answering device. Four groups of switches which are powered on and then powered off cooperating with a latch circuit which is arranged in a master station and is connected with the switches. Answer information by students can be effectively delivered to and stored in a latch in the master station to facilitate a computer to read out the answer information by students. The contact switching answering device can realize all functions of a responding and analyzing teaching system after treatment. The utility model modifies the existing answering devices composed of complicated electronic elements in an answering analyzer system and changes the way of delivering answer information by students to a master station. The utility model has the advantages of simple structure and working reliability.

Description

Contact switching answering device

The utility model belongs to the transponder in the computer-aided instruction device acknowledge analyser.

The transponder of the response analysis instrument (also claiming answer analyzer system, as follows) in the computer teaching is to be made up of with button and relevant circuit complicated integrated circuit (as parallel input, the serial input) at present.It must be by master station service voltage ability operate as normal.Transmit learner answering questions information to master station in addition and adopt impulse form, complex structure and be subject to external interference.

The purpose of this utility model is to make a kind of transponder of mainly being made up of a, b, c, d four groups of make-before-break formulas push switch and latch and peripheral circuit thereof, forms level formula learner answering questions information, and transmits to master station with the level signal form.

The solution the technical solution of the utility model is: by latch e in a, b, c, four groups of make-before-break formulas of d push switch and the master station and interlock circuit is that phase inverter F forms with relevant resistance connection cooperation.Wherein every group of switch of four groups of push switch a, b, c, d by two mutually the buttons of interlock form just (A, S ₁), (B, S ₂), (C, S ₃), (D, S ₄) these keyswitches are installed in (as shown in Figure 4) in the same housing.Latch e, phase inverter F and resistance device thereof are in master station.Four groups of push switch a, b, c, d can be mechanical type (as being converted by five groups of electric fan switches), also can be every group and be formed by two thin film switch superpositions.

The utility model form answer information---answer-back code is a level signal, rather than pulse signal of the prior art.Be easy to latch, antijamming capability is strong.The code that directly forms in this parallel transfer transponder is faster and direct than existing serial transfer speed, is easy to be accepted by computing machine.Make-before-break formula push switch in the utility model is simple in structure, reliable operation, long service life, and its response analysis instrument function and performance of constituting are improved greatly.

Fig. 1 is circuit structure of the present utility model and schematic diagram thereof.

Fig. 2 is the utility model mechanical type push switch synoptic diagram.

Fig. 3 is the utility model diaphragm type push switch synoptic diagram.

Fig. 4 is the utility model shape assumption diagram.

In conjunction with Figure of description 1-3 structure of the present utility model and principle thereof are further described.

With reference to figure 1, core of the present utility model is that a, b are arranged in the transponder, c, four groups of make-before-break formulas of d push switch, the ingenious connection of the latch e circuit in this switch and the master station.Shown in Figure 2 when push switch is the self-control mechanical type, the formation of every group of switch.1. be reed, 2. for knob, 3. for the make-before-break contact A, 4. be the logical contact S that breaks earlier in back ₁1. ground connection of reed in the use, 3. the contact connects the latch data input end, and 4. the contact connects latch by phase inverter F and makes and touch input end.2. if adopt five grades of piano type electric fan switches to convert.Utilize reed in the fan swicth and above-mentioned A, S after the repacking ₁The contact forms.Method of attachment in form and the use is identical with 1.3. superposition forms if push switch adopts diaphragm type, and as shown in Figure 3, every group of a, b, four groups of button of c, d are made up of upper and lower two superpositions thin film switch together.Have among the figure 1., 2., 3., 4. a contact and connecting line thereof.In the use with 6. 8. connection circuit ground of connecting line.5. connecting line connects the latch data input end.7. connecting line connects latch by phase inverter and makes input end S.Wherein 1., 2. be make-before-break formula contact A, 3., 4. be the logical earlier disconnected contact S in back ₁9. be thin film switch.

Be the course of work and principle of work thereof below, every group of switch is made up of two push switch of mutual interlock, when the student presses each switch, and the push switch make-before-break of top.Every group of switch can be corresponding to standardization examination, a, b, four kinds of answers of c, d in the test examination question.Because it is correct having only a kind of answer, when the student answers at every turn, need only be according to the understanding of oneself, a button of pressing wherein gets final product, pressed certain key after, just formed this student's answer information, concerning the computing machine of master station, this information is a code of being made up of tetrad actually.This yard should be answered the latch that device is arranged in the master station by cable and receive and latch.Treat the school simultaneously or after not having answered simultaneously, the related key that the teacher handles on the master station makes computing machine read in all learner answering questions information from each latch, thus carry out right and wrong analysis, statistics, comprehensive, store, demonstration.Last in court just can be with each student's score, pass rate, on average the data of grading print.

Latch data incoming line D at ordinary times ₁～D ₄By 9,1K resistance connects+the 5V power supply, is high level.Wherein inner lock storage information is selected a certain answer for " 1111 " as the student, and when pressing and decontroling a certain knob, as what press is a key, and the push switch of top is closed earlier in a key, makes A point location and continuous D ₁Current potential on the incoming line becomes " 0 " at this moment by high level " 1 " and since latch enable input end S ₁Still be changed to low level, D by circuit ₁High level on the incoming line " 1 " becomes the information of " 0 " and can not import.(just allowing the signal on the Data In-Line to enter latch when only becoming high level as the S of latch 74LS373 end) continues to be depressed into S to a key as the student ₁When push switch is closed, S ₁The point current potential becomes low level by high level, and the phase inverter F output terminal that is attached thereto becomes high level by low level this moment.Make the S end of latch become high level, at this moment D ₁Low level on the data line begins to enter latch.When the student decontrols a key, because the A knob compares S ₁Knob disconnects evening, so D ₁Low level on the incoming line will be maintained to after latch enable input end S becomes low level and close, and postpones a period of time just to disconnect and become high level.Like this, can guarantee that this answer information---code effectively enters latch.The student selects other to answer, as the principle of work when pressing b, c or d key is identical with a key.The answer message code that they are carried on master station is respectively 0111,1011,1101,1110.

Claims

1, a kind of contact-making switch formula transponder, it is characterized in that it is to be connected to cooperate by the push switch of a, b, c, four groups of make-before-breaks of d and the latch e in the master station and interlock circuit two large divisions thereof to form, wherein every group of switch among four groups of push switch a, b, c, the d by two mutually the buttons of interlock form just (A, S ₁), (B, S ₂), (C, S ₃), (D, S ₄), these keyswitches in parallel are installed in the same housing, and latch and interlock circuit thereof are installed in the master station.

2, contact-making switch formula transponder according to claim 1 is characterized in that described four groups of push switch can be the mechanical types that is converted by five groups of electric fan switches, also can be that every group of switch formed by two thin film switch superpositions.