SU377860A1 - DEVICE FOR CONTROL OF EMPLOYMENT AUDIENCE AND ATTENDANCE OF STUDENTS - Google Patents

Description

one

The device relates to systems for transmitting signals and serves to transmit information over a distance, for example, for use in automated information management systems of the educational process.

Devices for remote transmission of information are known, which contain selsynside sensors and selsyns receivers by the number of objects to be monitored.

Also known are devices for transmitting from workplaces and automatically recording information about equipment operation, comprising sensors, summing counters, dialers, and a switch.

Fundamentally, such devices can be used to transmit information from the classrooms of an educational institution to the control room about the audience occupancy and to monitor and record student attendance. However, with a large number of audiences, which is typical of an educational institution, the overall system of monitoring audience occupancy and recording student attendance and its installation is extremely complex and cumbersome, the cost of equipment is high.

A device for selecting the address of telecontrol objects is known, comprising key blocks with switching contacts, memory blocks and a command latching unit. In this device, for each controlled object

One key is installed with switching contacts. The fixed contacts of the keys are combined, the switching contacts of the keys of the objects of the same name in all groups and all objects are connected in series and connected to the corresponding inputs of the memory block. This device is simpler in design, but it cannot be used to monitor the occupancy of audiences and to record student attendance.

The aim of the invention is to create a simple in design and reliable device for monitoring the occupancy of audiences in an educational institution and automatically recording student attendance. This is achieved by the fact that in the device the sensor outputs are connected respectively to the code conversion unit and to the dynamic memory unit, the outputs of which are connected to the polling and control unit. The dynamic memory block is made on digital indicators, the cathodes of which are interconnected in pairs in pairs, and the anodes are pairwise combined. The drawing shows a block diagram of the proposed device.

The device contains a sensor / i- / “(n is the number of audiences) made up of several (for example, two) decade keys. One nz last intended for installation

“Ten, another -“ units. Via

One such sensor with two decadal keys can be set to any number (for example, the number of missing students) in the range from 0 to 99.

The dynamic memory block 2 contains (with two decade keys in the sensor) digital indicators 3 and 4 at the rate of two indicators per audience.

The contacts of the same name of all decade keys “units and the corresponding cathodes of all indicators 4 (“ units) are interconnected in parallel. Similarly connected contacts of the same name of all decade keys “tens and the corresponding cathodes of all indicators 3 (“ tens) ”. The anodes of each pair of indicators and the switching contacts of each pair of decade keys are interconnected and with the polling and control unit 5, the electronic switch of which provides a serial connection to the power source of the corresponding decade converters and indicator anodes.

The outputs from the paralleled contacts of the decade keys are also connected to the input of block 6, which converts the potential decimal code into a pulse code with the following information in the binary-decimal code.

Information about the number of absent students in each classroom is entered manually by the teacher using decade keys set in the classroom. Unit 5 performs a sequential survey of each audience (each sensor 1).

During the survey, the power source is connected by minus to the next sensor / and plus to the anodes of the corresponding pair of indicators 3 to 4.

The polling frequency of each sensor is selected on the order of 50 Hz, so despite the fact that the sensors are being polled consecutively, digital indicators of all audiences where people are busy are displayed on the dynamic memory unit, and information is displayed about the missing students in each classroom separately. If necessary, from the output of block 6, the same data can be obtained in binary code.

The proposed device is greatly simplified by reducing the total number of communication lines. Indeed, with a direct connection of each contact of the sensor / consisting of two switches, with digital indicators, for each audience, there are 20 wires from the contacts of each sensor and one wire to the switching contact, i. In this case, if there are, for example, 100 audiences

2100 wires.

In the proposed device, 20 communication lines provide any number of audiences and, for example, with 100 audiences, only 120 wires are needed.

The device is reliable in operation, highly accurate, provides visual monitoring of the state of the audience and student attendance at any current time, and at the same time provides control results in a digital code for input into a digital computer.

Subject invention

Claims (2)

1.A device for controlling the occupancy of audiences and student attendance, containing a polling and control unit, one of the outputs of which is connected to a code conversion unit, and the others with sensor inputs, and a dynamic memory unit, characterized in that, in order to simplify and increase reliability, in it, the outputs of the sensors are connected to the code conversion unit and to the dynamic memory unit, the outputs of which are connected to the polling and control unit. 2. The device according to claim 1, characterized in that the dynamic memory unit is made on digital indicators, the cathodes of which are interconnected in pairs in parallel, and the anodes in pairs are combined.