KR20000012521U - Hand terminal in meter reading system - Google Patents

Abstract

The present invention relates to a hand terminal in a meter reading system, and to provide a hand terminal that can accommodate both a meter operated by an infrared method and a meter operated by a radio frequency method. Therefore, the hand terminal according to the present invention is a radio frequency module for transmitting and receiving data related to meter reading in a wireless communication method, a carrier generator for transmitting meter reading request data in an infrared method, an infrared transmitter and a transmitter operating in an infrared method. Infrared receiver for receiving meter reading data, when the infrared mode is set by the user, the hand terminal controls the meter to transmit only the data that transmits data in the infrared method.When the radio frequency mode is set, the hand terminal transmits the data through the wireless communication method. It consists of a microcomputer that controls the meter to read and receive only the meter. Therefore, not only the meter operated by the wireless communication method but also the meter operated by the infrared method can be accommodated in one hand terminal.

Description

Hand terminal in meter reading system

The present invention relates to a handset in a meter reading system, and in particular, selectively operates a radio frequency (hereinafter referred to as RF) mode and an infrared ray (hereinafter referred to as IR) mode. It is about a hand terminal that can be.

The recently proposed meter reading system is configured to read the amount detected by the meter through a wireless communication method in order to improve the way the existing meter reads the amount (e.g., power) displayed on the meter with the naked eye. have. In other words, the recently proposed meter reading system is a meter that can detect the amount of usage by an electrical method, and the content read through the hand terminal and the hand terminal that can read data on the amount of usage detected by the meter through wireless communication with the meter. The basic configuration is a computer system capable of analyzing.

Therefore, the above-described meter reading system has a disadvantage that its field of use is limited to a meter capable of transmitting and receiving data in a radio frequency manner.

The present invention has been made to solve the above-mentioned disadvantages, and the object of the present invention is to provide a hand terminal that can selectively use a radio frequency method and an infrared method when reading a meter in a meter reading system.

In order to achieve the above objects, an apparatus according to the present invention includes a key input unit for inputting a user's command, a RAM for storing data read from at least one meter, a reset unit for providing a reset signal, a read data and a menu. A hand terminal configured to include a display unit for displaying a screen, a wired communication unit for transmitting and receiving data to and from a metering server analyzing the read data, and a radio frequency module for transmitting and receiving data with a meter capable of transmitting and receiving data in a radio frequency manner. An infrared transmitter for transmitting meter reading request data to a meter capable of transmitting and receiving data in an infrared manner; a carrier generator for generating a carrier for controlling driving of the infrared transmitter; An infrared receiver for receiving data transmitted from a meter capable of transmitting and receiving data in an infrared manner; when an infrared mode is set through a key input unit, a carrier generation unit is controlled to transmit a metering request signal made in an infrared manner, and is applied from an infrared receiver Meter reading data is stored in the RAM to control the hand terminal to accept only the meter operated by the infrared method, and when the radio frequency mode is set through the key input unit, the meter is operated by the wireless communication method by only transmitting and receiving through the radio frequency module It characterized in that it comprises a microcomputer to control to accommodate only.

1 is a block diagram of a hand terminal according to the present invention,

FIG. 2 is an operation flowchart of the hand terminal shown in FIG. 1.

Explanation of symbols for main parts of the drawings

102: key input unit 104: control unit

106: reset unit 108: IR receiver

110: LCD display unit 112: radio frequency module

114: IR carrier generating unit

106: RF (Radio Frequency) communication module 108: storage unit

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a functional block diagram of a hand terminal according to the present invention, which can selectively set a radio frequency mode and an infrared mode by a command applied from a key input unit 102 and a key input unit 102 for inputting a user's command. Displays a microcomputer 104, a reset unit 106 that is powered or controlled by a user to generate a signal for resetting a hand terminal, a RAM 108 that stores metered data, meter data and menu screens, and the like. LCD (Liquid Crystal Display) display unit 110, the radio frequency module 112 for the meter reading processing for the meter not shown, the carrier generation for transmitting the meter reading request data for the meter not shown in the infrared method The unit 114 and the IR (Infrared Ray, hereinafter referred to as IR) transmission unit 116, IR receiver 118 transmitted in an infrared manner from the meter according to the meter reading request, meter reading server not shown It is composed of a wired communication unit 120 for transmitting and receiving data.

FIG. 2 is an operational flowchart of the apparatus shown in FIG. 1.

Next, the operation of the apparatus shown in FIG. 1 will be described in detail with reference to FIG. 2.

First, when the reset key is controlled by the power supply or the user, the reset signal is applied from the reset unit 106 to the microcomputer 104. Accordingly, the microcomputer 104 proceeds to step 201 of FIG. 2 to initialize the RAM not shown in the microcomputer 104, sets an initial value to an internal timer, and then proceeds to step 202.

In step 202, the microcomputer 104 checks whether at least one meter reading data exists in the RAM 108 for storing meter reading data, and if at least one meter reading data exists, check whether the stored meter reading data is normal. do. The method of checking whether the data that can be used as the reading data is numeric information represented by 0 to 9 is stored. Therefore, data other than this numeric information is stored (for example, information such as A), or data consisting of all zeros is stored. If so, it is determined that wrong metering data is stored.

Therefore, if the reading data stored in the RAM 108 is abnormal as a result of step 202, the process proceeds to step 204 through step 203 to initialize the RAM 108, and proceeds to step 205. However, as a result of checking in step 202, when at least one reading data is normally stored in the RAM 108, the process proceeds to step 205 through step 203.

In operation 205, the microcomputer 104 initializes the LCD display 110 and displays an initial menu screen.

If the operation mode applied through the key input unit 102 is the IR mode, the operation proceeds to step 207 through step 206 to set the operation mode of the hand terminal to the IR mode. Accordingly, the terminal connected to the radio frequency module 112 included in the microcomputer 104 is set to the inactive mode, and the terminal connected to the carrier generator 114 and the IR receiver 118 is set to the active mode. In step 208, it is checked whether 1 ms has elapsed. If the check results indicate that 1 ms has not elapsed after the IR mode is set, the standby state is maintained until 1 ms has elapsed.

As a result of the check, if 1 ms has elapsed, the process proceeds to step 209 through step 208, and the microcomputer 104 checks the key digit output and the key input to the key input unit 102 and checks whether 100 ms has elapsed. As a result of the check, if 100 ms has not elapsed, the process proceeds to step 211 and it is checked whether key data for setting a predetermined mode is input through the key input unit 102. As a result of the check, if key data is input, the process proceeds to step 212 to set an operation mode corresponding to the input key data. For example, if key data corresponding to '00H' is input from the key input unit 102, the controller enters the menu selection screen display mode and sets key reading meter ID input mode if key data corresponding to '01H' is input. .

Therefore, when a meter reading request command is applied, the microcomputer 104 controls the carrier generator 114 to generate a 38 KHz carrier, and accordingly, the carrier generator 114 generates a carrier having a corresponding frequency. The generated carriers drive transistors not shown in the IR transmitter 116 to transmit IR data for the meter reading request. Therefore, when a meter (not shown) configured to transmit and receive data in an infrared manner receives a metering request signal, and the metering data is transmitted in an IR manner, the microcomputer 104 receives the IR through the IR receiver 118. To send. The microcomputer 104 stores the received meter reading data in the RAM 108 and transmits the stored meter reading data to the meter reading server not shown through the wired communication unit 120 at an appropriate time. The wired communication unit 120 may be implemented by RS-232C.

However, as a result of checking in step 211, when no key data is input, the microcomputer 104 proceeds to step 213 and checks whether 15 seconds have elapsed after the IR mode is set in step 207. As a result of the check, if 15 seconds have not elapsed, the process returns to step 208. However, after 15 seconds have elapsed, the process proceeds to step 214 to set the power down mode to minimize power consumption of the hand terminal.

On the other hand, as a result of checking in step 210, if 100ms has elapsed after setting to the IR mode, the process proceeds to step 215, sets the 100ms timer again, sets to check the timer again, and proceeds to step 216 1 second has elapsed. This 1 second is the time connected with the 1 ms and 100 ms checks described above. Therefore, after 1 second is also set to the IR mode, it is checked whether 1 second has elapsed.

As a result of the check in step 216, if 1 second has not elapsed, the process proceeds to step 211 and operates in the same manner as described above. However, if 1 second has elapsed, the process proceeds to step 217 and again sets a 1 second timer, starts a timer check, and then proceeds to step 211. It is possible to determine whether 15 seconds have elapsed in step 213 based on the timer check performed in steps 208, 210, and 216.

As a result of checking in step 206, when key data for setting to the RF mode is applied from the key input unit 102, the microcomputer 104 proceeds from step 206 to step 218 to operate as an RF module. Set.

Accordingly, the portion connected to the carrier generator 114 and the IR receiver 118 is set to the inactive mode, and only the portion connected to the radio frequency module 112 is set to the active mode. The process then returns to step 208 to operate the same as in the above-described IR mode.

However, according to the result checked in step 211, the process proceeds to step 212, when the meter reading mode is set and the meter request data is transmitted, the current operation mode is the radio frequency mode, and thus the meter is sent to the meter not shown through the radio frequency module 112. When the meter reading data is transmitted from the meter, the radio frequency module 112 receives it and transmits it to the microcomputer 104, and the microcomputer 104 stores the RAM 108 in the RAM 108. The meter reading data stored in the RAM 108 stores the meter reading data in the order of meter reading regardless of the meter reading method.

As described above, the present invention provides a hand terminal to selectively operate the radio frequency communication method and the infrared method when the meter is metered, so that not only the meter operated by the radio frequency communication method as one hand terminal but also the infrared method. The meter can also be used to read the meter, which can extend the range of use of the hand terminal.

Claims (1)

A key input unit 102 for inputting a user's command, a RAM 108 for storing data read from at least one or more meters, a reset unit 106 for providing a reset signal, and reading the metered data and menu screens And a display unit 110, a wired communication unit 120 for transmitting and receiving data to and from a metering server analyzing the read data, and a radio frequency module 112 for transmitting and receiving data with a meter capable of transmitting and receiving data in a radio frequency manner. In a hand terminal configured to An infrared transmitter 116 for transmitting meter reading request data to a meter capable of transmitting and receiving data in an infrared manner; A carrier generator 114 for generating a carrier for controlling driving of the infrared transmitter 116; An infrared receiver 118 for receiving data transmitted from a meter capable of transmitting and receiving data in the infrared manner; When the infrared mode is set through the key input unit 102, the carrier generation unit 114 controls the meter reading request signal made in the infrared method, and reads the meter reading data applied from the infrared receiver 118. Stored in the 108 to control the hand terminal to accept only the meter operated in the infrared manner, and when the radio frequency mode is set through the key input unit 102, only the transmission and reception through the radio frequency module 112 is possible And a microcomputer for controlling to accommodate only the meter operated by the wireless communication method.