FORM 2
THE PATENT ACT, 1970
(39 of 1970)
&
THE PATENTES RULES, 2005
PROVISIONAL SPECIFICATION (See section 10, rule 13)
1. TITLE OF THE INVENTION
"A data fetching system for a DIN mountable energy meter"
2. APPLICANT(S)
(a) NAME: Larsen & Toubro Limited
(b) NATIONALITY: Indian Company registered under the
provisions of the Companies Act-1956.
(c) ADDRESS: Larsen & Toubro Limited
Electrical & Automation North Wing, Gate 7, Level 0, Powai Campus, Saki Vihar Road, Mumbai 400 072, INDIA
3. PREAMBLE OF THE DESCRIPTION
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.

Field of invention
The present invention relates to DIN rail mounted energy meters, and more particularly to a remote data fetching system for the DIN mountable energy meters.
Background of the invention
The energy meters known in the art are programmed to transmit data in a pre-determined format. Specifically, the energy meters include a meter register which comprises a microcontroller, a display, and memory elements. Meter pulses are proportional to the energy accumulated in the register. Each pulse represents a pre-determined quantum of energy consumed by a load. The register processes the input pulses in accordance with a pre-defined function, e.g., demand, time-of-use and the like. The data is stored in the register memory for display and/or transmission.
However, these energy meters fail to provide flexibility of data transmission between the meter register and reader which is often essential. For example, a user needs to be physically present in the proximity of these meters to explore various values on the meters such as Voltage, Current, Power factor and Frequency. Moreover, the existing energy meters in the art are incompetent to remotely provide daily, weekly or monthly energy consumption data to the user. Also, the prior art energy meter registers have limitations in transmitting the most current load profile data to the user at a remotely specified location.
Accordingly, there exists a need to provide a system for remotely transmitting data from the energy meters to handheld devices thereby overcoming all the drawbacks of the prior art.
Object of the invention

An object of the present invention is to provide a system for remotely fetching the data from a DIN Mountable Energy Meter to a handheld data destination device.
Another object of the present invention is to provide a customized application adapted for fetching data from the DIN Mountable Energy Meter to a user specified location in a user specified format.
Summary of the invention
Accordingly, the present invention provides a data fetching system adapted for remotely fetching the data from a DIN mountable energy meter. The data fetching system comprises a DIN mountable Wi-Fi module adapted to communicate with the DIN mountable energy meter through a first communication medium. The data fetching system includes a handheld data receiving device communicating with the DIN mountable Wi-Fi module through a second communication medium. The data fetching system includes a plurality of screens on the handheld data receiving device presented by a customized application loaded on the handheld data receiving device. The screens provide categorized remote access to a plurality of instantaneous parameters of the DIN mountable energy meter through the first communication medium and the second communication medium.
Brief description of the drawings
FIG. 1 is a block diagram that illustrates a data fetching system for a DIN Mountable Energy Meter constructed in accordance with the present invention; and
FIG. 2 is a flowchart illustrating operational steps of a customized application of the data fetching system for the DIN mountable energy meter of FIG. 1.
Detailed description of the invention

The foregoing objects of the present invention are accomplished and the problems and shortcomings associated with the prior art, techniques and approaches are overcome by the present invention as described below in the preferred embodiments.
Referring to FIG. 1, a data fetching system 10 constructed in accordance with the present invention is illustrated. The data fetching system 10 includes a DIN mountable energy meter 12, a DIN mountable Wi-Fi module 14, and a handheld data receiving device 16. It is understood here that 'DIN' referred herein is a mounting surface, such as for example a mounting surface of a rail or molded clip, that is commonly used to mount the energy meters 12 thereon.
In this one preferred embodiment, the DIN Mountable Wi-Fi module 14 (Wi-Fi module 14, hereinafter) is an intermediary device that sends and receives a plurality of commands between the energy meter 12 and the handheld data receiving device 16. The Wi-Fi module 14 communicates with the energy meter 12 through a first communication medium 18. The Wi-Fi module 14 communicates with the handheld data receiving device 16 through a second communication medium 20.
The DIN Mountable Energy Meter 12 (energy meter 12, hereinafter) is a data fetching source. The energy meter 12 is configured to measure a plurality of parameters such as voltage, current, power factor, frequency, instantaneous power, energy, monthly consumption, weekly consumption, daily consumption, Push-to-Push consumption, load profile and the like. The energy meter 12 is having a LCD display (not shown) adapted to display the above said parameters. The energy meter 12 includes a push button (not shown) that facilitates scrolling of the above mentioned parameters on the LCD Display of the energy meter 12.
The first communication medium 18 is an optical infrared light in this one particular embodiment. However, it is understood here that other types of communication mediums 18 may be used in conjunction with the Wi-Fi module 14 in other alternative embodiments of system 10. The energy meter 12 responds to a set of queries received

from the Wi-Fi module 14 through a preformatted data structure (not shown). The Wi-Fi module 14 includes a plurality of LEDs (not shown) adapted to indicate various conditions on the Wi-Fi module 14 such as for example power ON, network formation and receive/send information. The energy meter 12 includes an infrared phototransistor that is used to receive the data in energy meter to interact via optical infrared light medium. The Wi-Fi module 14 includes 2.4 GHz Radio chip supporting Wi-Fi protocol, Power amplifier & RF PCB Antenna that are provided on the Wi-Fi module to interact via the radio frequency medium.
The preformatted data structure structurally consists of energy meter raw data that is designed and depicted by a predefined protocol of common raw data structure for energy meters. The predefined data structure is adapted to infer information about energy meter data having details including but not limited to Energy, Voltage, Amps, Power, Power Factor, Present Day Consumption, Present Week Consumption, Present Month Consumption, Previous Day Consumption, Previous Week Consumption, Previous Month Consumption, present Push-to-Push kWh consumption, previous Push-to-Push kWh consumption and Load Survey Profile.
The second communication medium 20 is a radio frequency medium in this one particular embodiment. The second communication medium 20 fetches data from the Wi-Fi module 14 and transfers it to the hand held data receiving device 16. It is understood here that other types of communication mediums 20 may be used in conjunction with the Wi-Fi module 14 in other alternative embodiments of system 10.
The hand-held device 16 is loaded with a customized application (not shown). The customized application consists of a plurality of screens. Each of the screens is associated with a category having instantaneous parameters of similar group. For example, the customized application of the hand-held device 16 includes a first screen (not shown) that provides a back up data of last month's consumption, last week's consumption and last day's consumption grouped under a first category. Alternatively, the hand-held device 16 includes a second screen (not shown) that provides a data of present month's

consumption, present week's consumption, and present clay's consumption grouped under a second category.
In addition, the customized application of the hand -held device 16 includes a third screen (not shown) adapted for displaying last month's consumption in the local currency. A user needs to feed cost of one unit as an input that facilitates the third screen to display the value of last month's energy consumption as an output, thereby calculating the value in local currency after multiplying the last month energy consumption with the unit cost.
In addition, the customized application of the hand-held device 16 includes a fourth screen (not shown) in which last month's load profile graph is plotted. The load profile graph is adapted to enable an energy consumption trend analysis of the energy meter 12. The customized application of the hand-held device 16 provides an update button (not shown) that provides an updated data in the load profile graph format to the user at any time per the requirements of the user.
In operation, the customized Application provides the Graphical User Interface to the consumer by decrypting the raw data received from energy meter via Wi-Fi Module 14. The customized application gives the graphical interpretation of data based on daily /weekly /monthly energy consumption. The customized application enables the user to compare the consumption with past consumption. For example, the customized application facilitates comparison of the present week consumption with last week consumption in this one particular embodiment. Thus, the push-to-push consumption data facilitates user to monitor the consumption for any given time period in addition to facilitating the user to get approximate billing amount for the consumed energy as per the present unit rate.
The main functional feature of the customized application in accordance with the hand held device is that the customized application facilitates customized graphical representation of the numerical values thereby simplifying the data presentation to the common user. The past historical consumptions are shown in user friendly graphical

representation. The customized application interacts with the hardware components of the hand-held device/ energy meter 12 wherein the customized application interacts with Wi-Fi module 14 installed on the hand held device 16 and the Wi-Fi module 14 interacts with energy meter 12 through Infrared transceiver hardware.
Referring to FIG. 2, an operational sequence for the customized application is shown. In a first step 202, the user connects to Wi-Fi network via Wi-Fi module 14 and logs in to the customized application by entering a predefined user-ID and password in a step 204. In a next step 206, the user sends commands to fetch the data from the DIN energy meter 12. In a step 208, the process follows a next step 210 if the data is received from the energy meter 12, else it returns to the previous step 206. In a step 210, the energy parameters and other parameters are received thereby formatting the data to multiple graphs that are displayed in different tabs. In a next step 212, the customized application facilitates entry of the unit rate by the user. In a step 214, the customized application facilitates display of the monthly bill per entered unit rate and consumed energy. In a step 216, the customized application enables data to be updated at any point of time after pressing the refresh button. In a final step 218, the customized application enables the user to logout from the customized application.
Advantages of the present invention
1. The data fetching system 10 indicates energy consumption in local currency to the user.
2. The data fetching system 10 provides energy monitoring platform to the user.
3. The data fetching system 10 facilitates an auditing platform to the user.

3. The Wi-Fi module 14 provides a hassle free communication between the energy meter 12 and the hand held device 16.
4. The data fetching system 10 provides a galvanically isolated data transfer between the energy meter 12 and the hand held device 16 wherein both energy meter 12 & Wi-Fi Module 14 are having individual/independent power supply to form a safety barrier that blocks charge or current flow across that barrier but transfers the data through noncontact infrared optical medium. This enables both energy

meter 12 & Wi-Fi Module 14 to work independently without any electrical loading on each other.
5. The hand held device 16 provides a user friendly interface to the user.
6. The data fetching system 10 facilitates a trend analysis tool for last month load consumption data to the user.
7. The data fetching system 10 is capable to provide past and present energy consumption data of a month, of a week, and/or of a day to the user.
The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application, to thereby enable others skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omission and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the spirit or scope of the present invention.

We claim:
1. A data fetching system adapted for remotely fetching the data from a DIN mountable
energy meter, the data fetching system comprising:
a DIN mountable Wi-Fi module communicating with the DIN mountable energy meter through a first communication medium;
a handheld data receiving device communicating with the DIN mountable Wi-Fi module through a second communication medium;
a plurality of screens on the handheld data receiving device presented by a customized application loaded on the handheld data receiving device, the customized application facilitating categorized remote access to a plurality of instantaneous parameters of the DIN mountable energy meter through the first communication medium and the second communication medium.
2. The data fetching system as claimed in claim 1. wherein the first communication medium is an optical infrared light medium.
3. The data fetching system as claimed in claim 1, wherein the second communication medium is a radio frequency medium.