RU2620729C1 - Digital data collection system - Google Patents

Abstract

FIELD: information technology.

SUBSTANCE: an addressed data collection system which comprises of a control microcontroller with a bus controller, sensors that have their individual addresses recorded in the memory, a bus of electrical data and synchronization lines connecting the microcontroller terminals with the corresponding sensor outputs. In addition, a switch is added to the synchronization line break. All the signal inputs of the switch are connected to the microcontroller synchronization output. Each switch signal output is connected to a respective synchronization input of one of the sensors. The address input of the switch is linked to the port output of the microcontroller.

EFFECT: building a data collection system without limiting the number of sensors with the same individual addresses.

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Description

The invention relates to electronic distributed digital data collection systems.

Distributed data acquisition systems are known, consisting of:

- peripheral sources of digital data (for example, sensors with digital output);

- a set of signal lines for supplying control signals;

- a set of data lines for data transmission;

- A computer that controls the processes of data collection.

The start of the data collection process, the determination of the priority of the polling of sensors and other control functions are carried out in such systems by two-way signal transmission on the totality of the above lines (bus) in accordance with the exchange protocol, that is, with specific rules of interaction (interface) of the microcontroller with certain peripheral devices. Such systems are usually called interface or simply interfaces.

Known data acquisition systems based on a common two-wire serial interface (the so-called I ² C bus) use two signal lines: an SDA data line and an SCL synchronization line, and two devices are involved in the data collection process - a master and a slave (see Guk M. PC hardware interfaces. Encyclopedia. St. Petersburg. - 2002. - P. 422). The synchronization signals are set on the SCL line by the master device - in our case, a computer with a controller for controlling the bus (microcontroller), after which the data collection process begins by setting the address of the device being polled.

To make it possible to collect data from several slave peripheral devices (sensors with outputs for connecting to a data line and synchronization inputs - see http://www.robot-electronics.co.uk/i2c-tutorial), each sensor must be recorded in his memory in the manufacture of an individual address. In known systems, after the synchronization signal synchronization line is shared for all sensors, the microcontroller sets the individual address of a particular sensor on the data line common for all, after which it receives only data from it on the same line.

Thus, all sensors connected to the bus must have non-matching addresses, which is a technical drawback that limits the ability to configure a system containing several sensors, since, for example, all sensors of the same manufacturer have, as a rule, the same addresses.

A known system for collecting data from specialized sensors with variable addresses (see Logan C. Management of several peripheral devices on bus lines SPI, I ² C. Components and technologies, 2008, No. 7, pp. 32-39, Fig. 3 - prototype) .

In the prototype system, sensors connected as peripherals to the I ² C bus are equipped with three additional address contacts. Having fed a single or zero logic signal to each of these contacts, the user can independently write an individual address in the sensor’s memory by selecting it from eight predefined addresses.

However, such a number of different individual addresses is not enough, since the number of sensors in modern data acquisition systems can be in the hundreds, and among them there will certainly be sensors with the same addresses, which will disrupt the system. This is a serious technical disadvantage of the known system.

The technical result of the invention lies in the possibility of constructing a data acquisition system without limiting the number of sensors with the same individual addresses.

The technical result is achieved by the fact that the address data acquisition system contains a control microcontroller with a bus controller, sensors in the memory of which their individual addresses are recorded, a bus from electrical data and synchronization lines connecting the microcontroller outputs to the sensor outputs of the same name. A switch is additionally introduced into the gap of the synchronization line, all signal inputs of which are connected to the synchronization terminal of the microcontroller, each signal output of the switch is connected to the corresponding synchronization input of one of the sensors, the address input of the switch is connected to the terminal output of the microcontroller.

The structural diagram of the system is shown in the drawing.

The system contains a microcontroller 1 with data output 2, synchronization output 3, port 4 output, sensors 5, 6, 7, with data outputs 8, 9, 10, respectively, and synchronization inputs 11, 12, 13, a switch 14 with address input 15, signal inputs 16, 17, 18, signal outputs 19, 20, 21. The data output 2 of the microcontroller 1 is connected to the sensor outputs 8, 9, 10 of the same name, and the synchronization output 3 is connected to the combined signal inputs 16, 17, 18 of the switch 14. Signal outputs 19, 20, 21 of the switch 14 are connected to the synchronization inputs 11, 12, 13 of the sensors 5, 6, 7, respectively. The output of port 4 of the microcontroller 1 is connected to the address input 15 of the switch 14.

The system operates as follows.

To the address input 15 of the switch 14 from the output of port 4 of the microcontroller 1, a signal is selected for the sensor whose synchronization input must receive a synchronization signal through the signal output of the switch 14 from the combined outputs 16, 17, 18. After that, the microcontroller 1 can begin the process of collecting data by indicating the address of the selected sensor. In this case, other sensors with the same address will not be exchanged, since no signal was received at their synchronization inputs, since the synchronization signal is supplied to the synchronization output of a specific sensor through the switch 14 in turn, in the order determined by the polling protocol stored in the microcontroller.

Claims (1)

An address data collection system containing a control microcontroller with a bus controller, sensors in the memory of which their individual addresses are recorded, a bus from electrical data and synchronization lines connecting the microcontroller outputs to the sensor outputs of the same type, characterized in that a switch is additionally introduced into the gap of the synchronization line, all signal inputs of which are connected to the synchronization output of the microcontroller, each signal output of the switch is connected to the corresponding synchronization input of one of sensors, the address input of the switch is connected to the output port of the microcontroller.

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