CN111668928A - Display terminal and method for power protection device - Google Patents
Display terminal and method for power protection device Download PDFInfo
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- CN111668928A CN111668928A CN202010372485.2A CN202010372485A CN111668928A CN 111668928 A CN111668928 A CN 111668928A CN 202010372485 A CN202010372485 A CN 202010372485A CN 111668928 A CN111668928 A CN 111668928A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000004891 communication Methods 0.000 claims description 19
- 239000004973 liquid crystal related substance Substances 0.000 claims description 15
- 125000004122 cyclic group Chemical group 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 12
- 238000011161 development Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000003993 interaction Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 206010034719 Personality change Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/40—Display of information, e.g. of data or controls
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Human Computer Interaction (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
The invention discloses a display terminal and a method for an electric power protection device, wherein the display terminal adopts an independent CPU (central processing unit), is provided with a word stock file, is communicated with a host of the electric power protection device based on an RS232 serial port, and reads menu contents which are required to be modified frequently along with the change of a host program from the host of the electric power protection device. The invention does not depend on the power protection device body, does not limit a hardware platform, does not limit a host program, has universality, meets the changeable display requirements of the power secondary equipment, and reduces the development cost and the maintenance cost of the power protection device.
Description
Technical Field
The present invention relates to the field of industrial control and power system control, and in particular, to a display terminal and method for a power protection device.
Background
In the field of power protection, liquid crystal display and key processing of a power protection device are important man-machine interaction modes. The field operator needs to check the state of the device through the liquid crystal, read or set the device constant value, and perform remote control, remote regulation and other operations.
Due to different application scenarios of the power secondary device, different display terminal programs are generally required to be customized according to different host programs. The liquid crystal display terminal of the traditional power protection device shares a CPU with the device body and is closely connected with the device body, so that the display terminal often depends on a host program, when the host program is modified due to upgrading or non-standard requirements, the display terminal program often needs to be modified synchronously, and new development tasks and testing tasks are added. Moreover, devices in the field of industrial control and power system control are generally embedded devices, and have limited performance and resources, and therefore, the display requirements of how to utilize the limited resources to realize diversification of protection devices are faced.
Disclosure of Invention
Objects of the invention
The invention aims to provide a display terminal and a method for a power protection device, which can be suitable for different host programs aiming at diversified software requirements and meet the requirement of the universality of the display terminal of the protection device.
(II) technical scheme
In order to solve the above problems, an aspect of the present invention provides a display terminal for an electric power protection device, which is characterized by comprising a human-machine control unit, a display unit and a structural module, wherein the human-machine control unit has an independent CPU, an on-chip ROM of the human-machine control unit stores a binary full library file, and the human-machine control unit communicates with a host of the electric power protection device to read menu contents; the display unit comprises a display and an input device; the structure module is used for connecting the man-machine control unit and the display unit and fixing the man-machine control unit and the display unit at a preset installation position.
According to one aspect of the invention, the human machine control unit comprises two independent circuits, a main power supply loop and a communication loop.
According to an aspect of the invention, wherein the main power supply loop supplies power to the display terminal.
According to one aspect of the invention, wherein the communication loop provides a JTAG debug port, an RJ45 panel debug port, and an RS232 serial port.
According to one aspect of the invention, the man-machine control unit reads menu contents based on the RS232 serial port and the host computer communication of the power protection device.
According to one aspect of the invention, wherein the display is a liquid crystal display, 240 x 160 resolution monochrome liquid crystal is used and the input device is a touch screen or a keyboard.
Another aspect of the present invention provides a menu display method for a display terminal, including
The method comprises the following steps: the power protection device is powered on, and the man-machine control unit reads a cyclic redundancy check code (CRC) of a host program of the power protection device through RS232 serial port communication;
step two: judging whether the cyclic redundancy check code (CRC) changes, if not, directly switching to the fourth step, and if so, switching to the third step;
step three: the man-machine control unit reads menu model information of the menu from a host of the power protection device through the RS232 serial port communication;
step four: responding to key operation to enter a menu, and reading the magnitude data information of the menu from a host of the power protection device through the serial port communication by the man-machine control unit;
step five: and refreshing menu information and displaying the menu model information and the magnitude data information.
According to another aspect of the invention, also include
The method comprises the following steps: the man-machine control unit reads the codes of the corresponding Chinese characters from a host of the electric power protection device;
step two: calculating an offset according to the code;
step three: finding out the corresponding lattice information position according to the offset, and reading the corresponding character library lattice information of the Chinese character from the on-chip ROM;
step four: and displaying the Chinese characters on the display unit according to the character library lattice information.
(III) advantageous effects
The technical scheme of the invention has the following beneficial technical effects that the display terminal does not depend on the power protection device body, does not limit a hardware platform and a host program, has universality, meets the variable display requirements of power secondary equipment, and reduces the development cost and the maintenance cost of the power protection device.
Drawings
Fig. 1 is a flowchart of information interaction of a display terminal according to an embodiment of the present invention.
Fig. 2 is a diagram illustrating a menu structure of a display terminal according to an embodiment of the present invention.
Fig. 3 is a flowchart of a menu information reading method of a display terminal according to an embodiment of the present invention.
Fig. 4 is a flowchart of a chinese character display method of a display terminal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The power protection device is generally provided with a display terminal to realize a man-machine interaction function, so that field operators can conveniently check the state of the device, read or set the fixed value of the device, and perform remote control, remote regulation and other operations. The invention discloses a display terminal for an electric power protection device, which is independent of an electric power protection device body, does not limit a hardware platform and a host program, has universality, and can read menu contents needing to be modified along with the change of the host program of the electric power protection device from a host.
According to one embodiment of the invention, the display terminal of the power protection device comprises a man-machine control unit, a liquid crystal display unit and a liquid crystal structure module. The man-machine control unit comprises two independent circuits of a main power circuit and a communication circuit, the main power circuit is used for supplying power to the display terminal, the communication circuit is used for providing a JTAG debugging port, an RJ45 panel debugging port and an RS-232, the JTAG debugging port is a programming port of a display terminal program, the RJ45 panel debugging port can be connected with a debugging tool of a CPU of a host, and the RS-232 is a communication serial port of the host. The man-machine control unit is provided with an independent CPU (central processing unit), is independent of a host of the power protection device, and the ROM in the chip of the man-machine control unit stores a binary full-word library file and is communicated with the power protection device based on an RS232 serial port to read menu contents. The liquid crystal display unit comprises a liquid crystal display and a touch screen, wherein the liquid crystal display is used for displaying information, 240 × 160 resolution monochromatic liquid crystal can be used, the touch screen is used for inputting information, and a keyboard can be used for replacing the touch screen. The liquid crystal structure module is connected with the man-machine control unit and the liquid crystal display unit and is fixed at a preset mounting position.
Fig. 1 shows an information interaction flow diagram of a display terminal. It can be seen that the display information of the menu 2 is read from the host 1, and the display information of the menu 2 can be classified into three types of the fixed display 3, the menu model 4, and the magnitude data 5. The fixed display information is a part fixedly displayed in the menu and cannot be modified along with the change of the host program, so that the fixed display information does not need to be processed. The menu model information refers to short names and units, such as a fixed value menu and an analog quantity menu, and the contents of the menu model information can be modified along with the change of the host program, but the information is the same for the same host program. The information quantity of the menu model information is large, and it takes ten seconds to finish reading all the menu model information, and in order to improve the operating efficiency of the power protection device, whether the information needs to be read or not can be judged by a method of reading Cyclic Redundancy Check (CRC) of a host. The quantity data information refers to numerical values in a menu, such as an analog quantity voltage value, a current value, a fixed value over-current for a fixed period of time, and an over-current for a period of time, and the contents of the numerical values can change in the operation process of the power protection device and need to be read from a host of the power protection device at any time.
Fig. 2 shows a menu structure diagram of a display terminal, and it can be seen that the menu includes 4 columns of display contents, which correspond to No., quantity, abbreviation and unit, respectively. And classifying the menu display contents according to the classification mode. The No. column is a serial number column whose content does not change with the host program, and belongs to fixed display information. The column shows "over-current 1 period constant value", "over-current 1 period time" and "high voltage constant value", which are related to the host program and modified with the change of the host program, but the same information for the same host program belongs to the menu model information. The unit columns show "a", "S" and "V", which correspond to the content of the abbreviated columns and are also modified as the host program changes, but the same information for the same host program, and thus also belong to menu model information. The quantity value columns show "10.00", "100.00" and "100.00", which are all measurement data, and the measurement data change in real time during the operation of the power protection device and need to be read from the host of the power protection device at any time, and belong to quantity value information. Since the display content of magnitude, abbreviation and unit column will change with time, the display content of magnitude, abbreviation and unit column needs to be read from the host. When the display contents of the abbreviated column and the unit column are read, whether the host program is changed is judged through whether the host CRC (cyclic redundancy check code) is changed, so the display contents of the abbreviated column and the unit column are read after the power protection device is powered on and the host CRC is judged to be changed. The display content of the quantity value column is read from the host of the power protection device in real time each time a certain menu is entered.
Fig. 3 shows a flowchart of a menu information reading method of a display terminal, which includes the following steps:
s11: the device is powered on and reads the CRC (cyclic redundancy check) of the host program. Once the power protection device is powered on, the display terminal reads a host program CRC (cyclic redundancy check code) of the power protection device through serial port communication.
S12: and judging whether the CRC of the host program changes. If so, it indicates that the host program has changed, and the process proceeds to S13. If not, the CRC does not change, and S14 is entered.
S13: menu model information is read from a host of the power protection device. The read menu model information is stored in the memory of the human-machine control unit.
S14: and responding to key operation to read the value data information. When a certain menu is entered in response to a key operation, the magnitude information of the menu is read from the host, and the read magnitude information is stored in the memory of the man-machine control unit.
S15: and refreshing menu information and displaying the menu model information and the magnitude data information.
The method reads the menu content which needs to be modified along with the change of the host program from the host, based on serial port communication, the read content is divided according to classes by utilizing the expandable characteristic of a modbus protocol, the function codes of the same class of menu messages are the same, and the message formats of the same function code are the same, so that the message issuing and the message analysis are simple and convenient.
Fig. 4 shows a flow chart of a chinese character display method of the display terminal. The method includes the binary system full word stock file into the ROM of the display terminal chip, and the first address of the word stock file in the ROM is obtained to display a certain Chinese character. The method specifically comprises the following steps:
s21: and reading the code of the Chinese character. The Chinese characters in the menu model are coded values of corresponding Chinese characters read from a host, such as GB2312 codes.
S22: and calculating the offset of the Chinese character through formula conversion. For example, when the offset of the Chinese character in the word stock file is calculated according to the GB2312 code of the Chinese character, the adopted conversion formula is as follows:
offset (94 x (first byte of inner code-0 xa0-1) + (second byte of inner code-0 xa0-1)) × 32
The inner code refers to Chinese character coding, for example, the code of the Chinese character "o" GB2312 is 0xb0a1, and the offset of the Chinese character "o" in the word stock HZK16 file is 0xb 040.
S23: and obtaining the character library lattice information of the Chinese characters according to the offset. And finding out the corresponding lattice information position according to the offset, and reading the corresponding character library lattice information of the Chinese character from the ROM, wherein the 16 th character is 32 bytes.
S24: and displaying the Chinese characters. And finishing the Chinese character display according to the dot matrix information.
The method has the advantages that any Chinese character can be displayed, the problem that the character library needs to be updated by the display terminal when the Chinese character changes due to the upgrading of the host program can be solved, and the problem of universality of the display terminal is solved.
In summary, in order to meet the requirement of the display terminal universality of the power protection device, the invention discloses a display terminal for the power protection device, which adopts an independent CPU, is provided with a library file, is in communication with the body of the power protection device based on an RS232 serial port, and is often read from a host computer along with the change of a host computer program to obtain menu contents which need to be modified. Therefore, the display terminal does not depend on the power protection device body, does not limit a hardware platform, does not limit a host program, and has universality. The invention also discloses a display method for the power protection device, which can be applied to the power secondary equipment, and the menu model and the magnitude data are read through serial port communication, so that the variable display requirements of the power secondary equipment are met, and the development cost and the maintenance cost of the power protection device are reduced.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (8)
1. A display terminal for a power protection device is characterized by comprising a man-machine control unit, a display unit and a structure module, wherein the man-machine control unit is provided with an independent CPU (central processing unit), an on-chip ROM (read only memory) of the man-machine control unit stores a binary full library file, and the man-machine control unit is communicated with a host of the power protection device to read menu contents; the display unit comprises a display and an input device; the structure module is used for connecting the man-machine control unit and the display unit and fixing the man-machine control unit and the display unit at a preset installation position.
2. The display terminal of claim 1, wherein the human-machine control unit comprises two independent circuits, a main power loop and a communication loop.
3. The display terminal of claim 2, wherein the main power supply loop powers the display terminal.
4. The display terminal of claim 2, wherein the communication loop provides a JTAG debug port, an RJ45 panel debug port, and an RS232 serial port.
5. The display terminal according to claim 4, wherein the human-machine control unit reads menu contents based on the RS232 serial port and the host communication of the power protection device.
6. The display terminal of claim 1, wherein the display is a liquid crystal display, 240 x 160 resolution monochrome liquid crystal is used, and the input device is a touch screen or a keypad.
7. A menu display method for a display terminal according to claims 1 to 6, comprising
The method comprises the following steps: the power protection device is powered on, and the man-machine control unit reads a cyclic redundancy check code (CRC) of a host program of the power protection device through RS232 serial port communication;
step two: judging whether the cyclic redundancy check code (CRC) changes, if not, directly switching to the fourth step, and if so, switching to the third step;
step three: the man-machine control unit reads menu model information of the menu from a host of the power protection device through the RS232 serial port communication;
step four: responding to key operation to enter a menu, and reading the magnitude data information of the menu from a host of the power protection device through the serial port communication by the man-machine control unit;
step five: and refreshing menu information and displaying the menu model information and the magnitude data information.
8. The menu display method of claim 7, further comprising
The method comprises the following steps: the man-machine control unit reads the codes of the corresponding Chinese characters from a host of the electric power protection device;
step two: calculating an offset according to the code;
step three: finding out the corresponding lattice information position according to the offset, and reading the corresponding character library lattice information of the Chinese character from the on-chip ROM;
step four: and displaying the Chinese characters on the display unit according to the character library lattice information.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010372485.2A CN111668928A (en) | 2020-05-06 | 2020-05-06 | Display terminal and method for power protection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010372485.2A CN111668928A (en) | 2020-05-06 | 2020-05-06 | Display terminal and method for power protection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112114798A (en) * | 2020-09-25 | 2020-12-22 | 深圳市易优电气有限公司 | Display method, device, terminal and storage medium of LCD |
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| CN112114798A (en) * | 2020-09-25 | 2020-12-22 | 深圳市易优电气有限公司 | Display method, device, terminal and storage medium of LCD |
| CN112114798B (en) * | 2020-09-25 | 2024-02-06 | 深圳市易优电气有限公司 | LCD display method, device, terminal and storage medium |
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