JPH0574043U - Data monitor device - Google Patents

Abstract

(57) [Abstract] [Purpose] To be able to directly monitor the digital data contained in the high frequency signal of the radio wave with the data monitoring device. [Configuration] A high-frequency signal received via an antenna is selectively output by a high-frequency receiving circuit to a low-frequency receiving circuit by selectively outputting only a radio wave having a preset frequency in the 400 MHz band of a specific low-power radio radio wave, and is input from the high-frequency signal. While discriminating the waves, the signal wave is input to the demodulation circuit and converted into a binary serial data signal, and then the serial data signal is converted into hexadecimal or ASCII code by the synchronization circuit and input to the display circuit, A data monitor device for displaying on the display of the display circuit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a data monitor device for monitoring data in which a digital data signal is superimposed on a high frequency signal in a specific low power radio band (400 MHz band).

[0002]

[Prior Art]

 Conventionally, as shown in the connection method and block diagram of FIG. 4 and FIG. 5, a data monitor device has a data monitor device 4 shown in FIG. After demodulating a series signal of data input through the interface circuit 5 by the demodulation circuit 6, the control circuit 7 performs S / P conversion and inputs the data to the display circuit 8 to display the data. It was directly connected.

[0003]

[Problems to be solved by the device]

 As described above, since the conventional data monitor device 4 is configured to suck up the data signal, it has a drawback that it cannot monitor the content of wireless data communication that does not use a wired signal line. In data communication using specified low power radio, data is sent with a sync code at the beginning of the data, and in conventional devices that do not have a circuit for decoding this sync code, even if data from radio waves Even if the signal was taken out, there was a drawback that the data could not be synchronized. Therefore, an object of the present invention is to provide a data monitor device capable of directly monitoring digital data included in a radio frequency signal.

[0004]

[Means for Solving the Problems]

 That is, according to the present invention, the high frequency signal received through the antenna is selectively output by the high frequency receiving circuit to the low frequency receiving circuit by selectively outputting only the radio wave having the preset frequency in the 400 MHz band of the specific low power radio wave. In addition to discriminating the signal wave from the signal, inputting the signal wave into the demodulation circuit and converting it into a binary serial data signal, the synchronizing circuit converts the serial data signal into hexadecimal or ASCII code, and the display circuit It is a data monitor device for converting a digital data signal in which a digital signal is superimposed on a high-frequency signal transmitted serially between devices into hexadecimal and ASCII codes to be displayed on a display.

[0005]

[Action]

 In the case of the data monitor device configured as described above, the high frequency signal received through the antenna is the preset low power radio wave of 429.81225 to 429. Only the radio wave between 9250MHZ or 449.7125 to 449.8250MHZ is selectively output from the high frequency receiving circuit, the carrier wave is removed from the waveform in the low frequency receiving circuit, the signal wave is discriminated, and then FSK or MSK modulated. The signal wave from the low-frequency receiving circuit is converted into a binary serial data signal by the demodulation circuit, and the binary serial data signal from the demodulation circuit is converted into hexadecimal or ASCII code by the synchronization circuit. The data input to the display circuit and converted into hexadecimal or ASCII code is displayed on the display.

[0006]

[Effect of the device]

 As a result, the present invention has the effect of directly monitoring the digital data contained in the high frequency signal transmitted serially between the devices.

[0007]

【Example】

 Next, the configuration of an embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 11 designates a preset low power radio wave 429 from the high frequency signal received via the antenna 13 by the local oscillation signal sent from the PLL circuit 12. 8125-429.9250 MHz or 449.7125-449.8250 MHz high-frequency receiving circuit that selectively outputs only the radio wave. In the figure, 14 is a signal wave by removing the carrier from the waveform output from the high-frequency receiving circuit 11. A low-frequency receiving circuit for discriminating between the FSK and MSK modulated signal waves from the low-frequency receiving circuit 14 into a binary serial data signal; A synchronizing circuit for synchronizing the binary serial data signal from the demodulation circuit 15 and converting the serial data signal into hexadecimal or ASCII code, in the figure 17, is a hexadecimal or ASCII code from the synchronizing circuit 16. A display circuit for inputting the converted data signal and displaying it on a display (not shown), 18 in the figure appropriately controls the entire circuit by an operator's operation or the like. Control circuit. In addition, FIG. 4 shows a signal format of a specific low power radio, and in the case of this device, data is synchronized by detecting a frame synchronization signal, and the synchronization circuit 16 is a 31-bit shift register. The serial data sent from the demodulation circuit 15 are sequentially sent to the shift register and compared with the M-sequence code which is a synchronizing signal to obtain synchronization.

Next, the operation of this embodiment will be described. In the case of the data monitor device 19 configured as described above, the high frequency signal received via the antenna 13 is specified by the local oscillation signal transmitted from the PLL circuit 12, and the preset low power radio wave of 429.8125 is set in advance. Only radio waves between 429.9250 MHz or 449.7125 to 449.8250 MHz are selectively output from the high frequency receiving circuit 11 and the carrier wave is removed from the waveform in the low frequency receiving circuit 14 to discriminate the signal wave, and then FSK. Alternatively, the signal wave from the low frequency receiving circuit 14 which is MSK modulated is converted into a binary serial data signal by the demodulation circuit 15, and the binary serial data signal from the demodulation circuit 15 is converted into a hexadecimal signal by the synchronizing circuit 16. Or, after being converted to ASCII code, the data input to the display circuit 17 and converted to hexadecimal or ASCII code are converted into data. Appears on the spray.

As described above, the data monitor device 19 of this embodiment can directly and easily monitor digital data transmitted as a radio wave of a high frequency signal that cannot be handled by a normal monitor device. By changing the receiving circuit and the PLL circuit of the embodiment, it is possible to utilize as a monitor of the digital signal of the cordless horn band (250 MHz, 380 MHz), and in the case of this embodiment, the high frequency receiving circuit 11 and the synchronizing circuit 16 are used. By adding to the conventional data monitoring device, it is possible to directly monitor the digital data contained in the radio frequency signal.

Next, FIG. 3 shows a function of transmitting pseudo data of a calling code to the data monitor device 19 of FIG. 1, that is, the pseudo data input to the modulation / demodulation circuit 21 via the input circuit 20 is in a modulated state. In the embodiment of the data monitor device 24, which is provided with the function of being input from the low frequency transmission circuit 22 to the high frequency transmission circuit 23 and being output to the outside as a high frequency signal in which pseudo data is superimposed, In communication, it is stipulated that when sending data on the control channel, the calling code (see FIG. 2) is sent after the synchronization signal. The call code is given as a unique number to the device. Therefore, when testing the data reception, the same calling code is always sent from the transmitting side, and the equipment must be replaced in order to change the calling code. Therefore, the call code was created as pseudo data so that it could be sent continuously after the sync signal. However, in this case, the high frequency transmission circuit 23 is provided with an attenuator so that the signal is not radiated as a radio wave, and the signal is directly sent to the receiver by a cable. With such a data monitor device 24, it is possible to easily perform a data reception test of a specific low power radio.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of a data monitor device 19.

FIG. 2 is a signal format in specific low power radio.

FIG. 3 is a block circuit diagram of a data monitor device 24.

FIG. 4 is a connection diagram of a conventional data monitor device 4.

FIG. 5 is a block circuit diagram of a conventional data monitor device 4.

[Explanation of symbols]

 11 high-frequency receiving circuit 12 PLL circuit 13 antenna 14 low-frequency receiving circuit 15 demodulating circuit 16 synchronizing circuit 17 display circuit 18 control circuit 19 data monitor device

Claims (1)

[Scope of utility model registration request] 1. A high-frequency signal received via an antenna is fed by a high-frequency receiving circuit to a specific low-power radio wave of 400 MHz.
Selects and outputs only the radio wave of the preset frequency of the band and inputs it to the low frequency receiving circuit, distinguishes the signal wave from the high frequency signal, and inputs the signal wave to the demodulation circuit to convert it to a binary serial data signal. After that, the serial data signal is converted into hexadecimal or ASCII code by the synchronizing circuit and input to the display circuit, and the digital data signal in which the digital signal is superimposed on the high frequency signal serially transmitted between the devices is hexadecimal and ASCII. A data monitor device which is converted into a code and displayed on a display.