RU197323U1 - DEVICE FOR DIAGNOSTICS OF ELECTRONIC EQUIPMENT OPERATING USING THE RS-485 INTERFACE ACCORDING TO MODBUS RTU PROTOCOL - Google Patents

Abstract

The utility model relates to microelectronics and is intended for the diagnosis of electronic equipment operating using the RS-485 interface using the Modbus RTU protocol used in automated monitoring and process control systems. The technical result of the utility model is to simplify the process of diagnosing electronic equipment operating using the RS-485 interface using the Modbus RTU protocol. The technical result is achieved by combining the communication function with electronic equipment, through the RS-485 interface via Modbus RTU protocol and information input / output functions in one stand-alone device. To do this, the device is made in the form of a device, all the electronic components of which are enclosed in a case, on the front panel of the case there is a liquid crystal display and three buttons, on the top panel of which there is a switch and a two-wire cable exits from it for connection to the diagnosed equipment via the RS-485 interface. To display readable information, a liquid crystal display is used. 4 ill.

Description

The utility model relates to microelectronics and is intended for the diagnosis of electronic equipment operating using the RS-485 interface using the Modbus RTU protocol used in automated monitoring and process control systems in various fields of industry, housing and communal services and in any other areas.

Closest to the claimed is an automatic converter of USB / RS-485 interfaces (RF patent No. 127564 U1, IPC H04L 12/66, G06F 5/00, 01/01/2006), selected as a prototype, containing a USB interface unit and an RS- interface unit 485.

A disadvantage of the known device is the use of a personal computer as a device for inputting and outputting information using the Modbus RTU protocol, which is not an advantageous solution in terms of using the computing power of a personal computer.

The objective of the utility model is to combine the communication function with electronic equipment via the RS-485 interface via Modbus RTU protocol and information input / output functions in one stand-alone device.

The technical result is a simplification of the diagnostic process of electronic equipment operating using the RS-485 interface using the Modbus RTU protocol.

The problem is solved by creating a special device for diagnosing electronic equipment operating using the RS-485 interface using the Modbus RTU protocol, designed to determine the malfunction of electronic equipment operating using the RS-485 interface using the Modbus RTU protocol.

The claimed device for the diagnosis of electronic equipment operating using the RS-485 interface using the Modbus RTU protocol is explained using:

FIG. 1 - the appearance of the device;

FIG. 2 is an electrical schematic diagram of a device;

FIG. 3 is a block diagram of the algorithm of the device;

FIG. 4 - connection diagram of the device to the diagnosed equipment.

As shown in FIG. 1 device is made in the form of a device, all electronic components of which are enclosed in a housing (2). The housing (2) has a parallelepiped shape with dimensions of 90 × 30 × 130 mm. On the front panel of the case (2) there is a 1602A character LCD (5) and three buttons without a lock (4), on the top panel of the case (2) there is a switch (3), a two-wire wire (1) comes out of it to connect to diagnosed equipment (10) (see Fig. 4) via RS-485 interface. The upper panel of the housing (2) is opened to access the galvanic cell type 6F22 (8) (see Fig. 2).

As shown in FIG. 2, the ATMEGA328P microcontroller (6) is used as a control electronic-computing unit of the proposed device (9) (see Fig. 4), which has a relatively low cost and computational capabilities, which are quite sufficient to perform the necessary functions. To connect the serial port of the ATMEGA328P microcontroller (6) to the diagnosed equipment (10) (see Fig. 4), the UART TTL / RS-485 MAX485 interface converter (7) is used via the RS-485 interface. To display the read information, the 1602A symbol LCD (5) connected to the ATMEGA328P microcontroller (6) is used. To enter information, three buttons without a latch (4) are used, connected to the digital inputs of the ATMEGA328P microcontroller (6). The device is autonomous, works from a galvanic cell type 6F22 (8), connected to the device circuit via a switch (3) located on the top panel of the housing (2) (see Fig. 1).

As shown in FIG. 3 to provide the necessary functions of the device according to the flowchart algorithm, a program for the microcontroller is written.

As shown in FIG. 4, when working on the Modbus RTU protocol, the proposed device (9) acts as a master, and the diagnosed equipment (10) acts as a slave.

The proposed device (9) is connected to the diagnosed equipment (10) through the RS-485 interface port. The device is switched on using the switch (3). Using the buttons without a latch (4), the address of the equipment being diagnosed, the command, the register address, the number of registers to be read, or the value to be written to the register depending on the command are entered, the value of the data entered is displayed on the 1602A character LCD (5). After confirming the entered data, the data received from the equipment being diagnosed (10) is displayed on the 1602A symbol LCD (5).

The salient features of the claimed device for the diagnosis of electronic equipment operating using the RS-485 interface via Modbus RTU protocol are:

the device is designed in such a way that allows you to diagnose equipment without using a personal computer;

the device is autonomous, does not require external power sources for operation;

the elements included in the device are simple and have a low cost;

the device has a relatively small size and weight;

the introduction of this device eliminates the use of expensive devices.

The claimed significant distinguishing features are unknown to us from the patent and scientific and technical information and are therefore “New”.

An electrical circuit diagram has been developed for the claimed device, a program for the microcontroller has been written, and a prototype has been manufactured, which was successfully tested in the diagnosis of electronic equipment operating using the RS-485 interface using the Modbus RTU protocol in the Privodinsky LPUMG of Gazprom transgaz Ukhta LLC. In this regard, the device declared by us meets the criterion of “Industrial applicability”.

The claimed device allows you to diagnose electronic equipment operating using the RS-485 interface using the Modbus RTU protocol, used in automated systems for monitoring and controlling technological processes in various fields of industry, housing and communal services and in any other areas, and is intended to detect electronic malfunction equipment operating using the RS-485 interface using the Modbus RTU protocol, without the use of other means, which to a large extent and simplify the diagnosis and will reduce costs for the purchase of an expensive PC.

Claims (1)

A device for diagnosing electronic equipment operating using the RS-485 interface using the Modbus RTU protocol, characterized in that it consists of a housing (2), a switch (3) is located on the upper panel of the housing (2), and a two-wire cable (1) comes out of it to connect to the diagnosed equipment (10) via the RS-485 interface, the ATMEGA328P microcontroller (6) is used as a control electronic computing unit, to connect the serial port of the ATMEGA328P microcontroller (6) to the diagnosed equipment (10) via The RS-485 interface uses the MAX485 UART TTL / RS-485 interface converter (7), the 1602A character LCD (5) connected to the ATMEGA328P microcontroller (6) is used to display the readout information, three are used to enter information buttons without a latch (4) connected to the digital inputs of the ATMEGA328P microcontroller (6), the device autonomously operates from a 6F22 type galvanic cell (8) connected to the device circuit via a switch (3) located on the top panel of the case (2).

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