JPH0723466A - Wireless data communication switching system - Google Patents

Abstract

(57) [Summary] [Purpose] It is not necessary to perform address judgment processing to select a communication partner, and a communication partner can be stably selected with a simple configuration. [Composition] A circuit for generating a tone signal of a plurality of frequencies is provided in a transmitter, and a receiver device detects a tone signal from a received signal sent thereto and selects a tone signal according to the type of the frequency. The received data signal is output only to the terminal. In the receiving device, a method of switching the switch to be output to each terminal by detecting the ton signal, and a method of providing the receiving device with a function of receiving only the ton signal of its own frequency, There is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in a data communication system by radio, sends a tone signal to a plurality of partner terminals, particularly FM signals.
The present invention relates to a wireless data communication switching system which can be automatically selected by a tone signal of a modulation system.

[0002]

2. Description of the Related Art Conventionally, in normal data communication, the address of the other party is added to the outside of the data and the other party's terminal is designated to determine whether or not the receiving side is the own address. As a result, the data was selectively received. Further, for example, in the "identification signal generator" disclosed in Japanese Patent Laid-Open No. 58-154081, the vibration energy of space is received by a wave receiver, rectified, and then the energy is frequency converted by a frequency conversion circuit. After the conversion, the coding circuit is operated by using the output as a clock, an arbitrary code number is generated in the coding circuit, and the code is sent to the outside from the coupler. In this way
A predetermined identification signal is generated and transmitted to the partner terminal.

[0003]

As described above, the conventional method for selecting the receiving party by using the wireless data communication device is address data for selecting the other party prior to communication. Was sent and received to select the communication partner.
Further, as a usual method, a method has been used in which a communication partner is selected by adding a partner selection address to the head of transmission / reception data every time. However, this method has the advantage that it can be expanded to a large-scale system, but it requires the function of adding a selected address to the data and the function of selecting and determining the address on both the transmitting side and the receiving side. It was necessary to install a processing device and the like in the data communication device. Therefore, in a small-scale wireless data communication device, there is a problem that the cost is increased and the function of the selection method is complicated and the wireless data communication device is enlarged. An object of the present invention is to solve the above-described conventional problems, to eliminate the need for determining the address or the like to select a communication partner, and to provide stable and easy wireless data selection. It is to provide a communication switching method.

[0004]

In order to achieve the above object, the wireless data communication switching system of the present invention is connected to a processing unit (2) and a transmission unit (1) for performing data transfer. And a receiving unit (1) that receives the transferred data and selects and outputs the designated terminal device (19a to 19n).
In the wireless data communication device consisting of 1), the transmitting unit (1) receives a tone signal of a plurality of frequencies that can be arbitrarily changed from the processing unit (2) or the outside in order to select a communication partner. A generating circuit (7) is provided, a tone signal of a selected type of frequency is added to the data signal and transmitted,
The receiving unit (11) detects a tone signal from the received signal and outputs the received data signal only to the terminal devices (19a to 19n) selected according to the frequency type of the detected tone signal. It is characterized in that a means (16) for doing so is provided.

[0005]

According to the present invention, it is possible to easily select a communication partner by taking advantage of the characteristics of the radio communication by the FM modulation system in which the signal is weak and the communication is possible even if there is noise. That is, the transmitting side of the wireless data communication device is provided with a function of mixing and modulating the selected tone signal different from the modulation signal of the transfer data and transmitting the same, and the receiving side is provided with the transfer data. A tone signal, which is a modulation signal separate from that of the receiver, is detected, and a function is provided to control the switching of the output partner by identifying the received tone signal frequency. Here, as for the identification by the tone signal frequency, the function such as the tone squelch is well known in the FM modulation type wireless communication device and the like, and this is used for the terminal selection function in the data communication of the computer. Of. In the transmission section of the wireless data communication device, an arbitrary tone signal frequency can be selected from the connected processing device, and it can also be selected by manual operation. The tone signal serving as an identification signal uses a frequency that is completely different from the modulation frequency of the transfer data, so that the receiving side of the wireless data communication device has a sufficient selection capability without erroneous detection. have.
Further, during data communication, the tone signal is always included in the transmission signal, so that the receiving side may return the selection signal only when there is the tone signal.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 are configuration diagrams of a transmitter and a receiver of a wireless data communication apparatus showing an embodiment of the present invention. In the transmission section of FIG. 1, 1 is a transmission section, 2 is a processing device, 3 is an interface section, 4 is a transmission data modulation section, 5 is a frequency mixing section, 6 is a tone selection signal, and 7 is a tone selection signal. −
Signal transmitter, 8 is a tone signal, 9 is a high frequency transmitter, 1
0 is a transmitting antenna. In the receiving section of FIG.
Is a receiving unit, 12 is a receiving antenna, 13 is a high frequency receiving unit,
Reference numeral 14 is a received signal, 15 is a received data demodulation section, 16 is a received data selection section, 17 is a tone signal detection circuit, 18 is a selection signal, and 19a, b and c are terminals, respectively. In FIG. 1, the transmission unit 1 of the wireless data communication device transmits the transmission data in the interface unit 3 in order to transmit the data transferred from the processing unit 2 according to the instruction of the processing unit 2. The receiving and transmitting data modulator 4 converts the digital signal into an analog signal for transmission and inputs the analog signal to the mixer 5. On the other hand, as the identification tone signal in the present invention, a tone selection signal 6 is given to the interface section 3 by an instruction from the processing device 2, or the tone selection signal 6 is supplied by an external switch. Is given.

When the tone selection signal 6 is input to the tone signal generator 7, the tone signal generator 7 always outputs a tone signal 8 having an arbitrary frequency. The transmission data converted into the transmission signal by the transmission data modulator 4 and the identification tone signal 8 are mixed in the mixer 5 to obtain (data signal) + (tone signal). High frequency transmitter 9 as a mixed signal
Be transmitted to. The mixed signal is FM-modulated by the high frequency transmitter 9 and then sent out from the transmitting antenna 10 as a high frequency FM radio wave. As shown in FIG. 2, in the receiving unit 11 of the wireless data communication device, the radio wave transmitted from the transmitting unit 1 of the wireless data communication device is received by the receiving antenna, and the high frequency receiving unit 13 performs detection. , The received signal 14 is output as a mixed signal of the data signal and the tone signal 8. The reception data demodulation unit 15 separates only the reception signal 14 from the reception signal 14 by a low frequency pass filter, demodulates the reception signal 14 and receives the reception signal.
Data to the data selection unit 16. On the other hand, the tone signal detector 17
Separates the received signal 14 by a low-frequency band filter only the tone signal, determines the frequency of the input tone signal, and selects a selection signal (SEL) 18 designated by the type.
Is output. The reception data selection unit 16 switches the data signal from the reception data demodulation unit 15 to any one of the terminals 19a, 19b, ... Data is sent. That is, in the tone signal detection unit 17, if the tone signal designates the terminal 19a, a selection signal for switching to a terminal corresponding to the terminal 19a is used, and a tone signal that designates the terminal 19b is used. If there is, a selection signal for switching to the terminal corresponding to the terminal 19b is output. Each terminal 19
Printers and displays are installed in a, b, and c, and the sent data are output to them.

FIG. 4 is a waveform diagram of the tone and data signals and the mixed signal in FIGS. The tone signal 8 generated by the tone signal generator 7 in FIG. 1 is a low-frequency sine wave, for example, as shown in FIG. The specified tone signal has a higher frequency. On the other hand, as shown in FIG. 4, the data signal is a signal having a frequency extremely higher than that of the tone signal, and is, for example, FM modulation or AM.
It is modulated. The data signal converted by the transmission data modulator 4 of FIG. 1 and the tone signal generated by the tone signal generator 7 are mixed in the mixer 5, and the high frequency transmitter 9 It is transmitted via the transmitting antenna 10.
The mixed wave mixed by the mixer 5, that is, the transmitted wave, has a waveform in which the data signal is superimposed on the tone signal as shown in FIG. The frequency of the tone signal designating the terminal a is the terminal b.
Since the frequency is lower than the frequency of the tone signal that specifies, the transmission wave also has a form in which the data signal is superimposed on the tone signal wave lower than that of the terminal b. When these transmission data are received by the receiving unit 11 of the wireless data communication device in FIG.
The received data demodulator 15 extracts the data signal with a filter, and the tone signal detection circuit 17 extracts the tone signal with a bandpass filter. The detected tone signal is
A selection signal (SEL) 18 for switching the changeover switch of the reception data selection section 16 becomes a reception data selection section 1
6 is transferred. By switching the switch of the reception data selection unit 16 to the terminal connected to the designated terminal, the terminal (19a ...
19n).

FIG. 3 is an overall schematic view of a wireless data communication system showing another embodiment of the present invention. In the case of FIG. 3, the reception data selection unit 16 is not required in the reception unit as shown in FIG. That is, this is a system in which the data signal (transmission wave) is received only by the terminal corresponding to the specified tone. That is, since the receiving unit of each terminal receives only the transmission wave included in its own tone signal, the select function is unnecessary. 1
Is a transmitter of a wireless data communication device, 2 is a processing device, 11
a, 11b, 11c are terminals, 19a, 19b ... 19
n is a terminal such as a printer or a display. Wireless data
The transmission unit 1 of the data communication device includes an interface unit 3 for controlling the signal from the processing unit 2, a transmission data modulation unit 4, a tone signal generation unit 7, a mixer 5, a high frequency transmission unit 9 and a transmission unit. It is composed of an antenna 10. That is, the configuration of the transmission unit 1 in FIG. 3 is the same as the configuration of the transmission unit 1 in FIG. On the other hand, the receivers 11a, 11b, 11 of the wireless data communication device
As a tone signal detection function, n detects only one type of tone signal frequency (that is, the frequency of the own terminal). Then, the receivers 11a of the wireless data communication devices,
11b, ... 11n include terminals 19a, 19b ...
By connecting 19n, the designated terminal can be selected as in the case of FIG. In this way, it is possible to easily switch the terminal for data communication without determining the content of the data to be transmitted. In addition,
Normally, as shown in the present embodiment, the data signal uses the FM modulation method, but it is not necessarily limited to the FM modulation, and the same applies to the AM modulation method and other methods. Further, if a tone signal is added in addition to the data signal so that the receiving side adds the ton signal and returns to the transmitting side, a data transmission / reception loop test can be performed. it can.

[0010]

As described above, according to the present invention,
Since the tone signal frequency selection method is used, it is not necessary to determine the address etc. to select the communication partner, and only while the tone signal fixed by hardware is detected. Since it suffices that the selection operation can be performed, a holding circuit or the like is not necessary, and a communication partner can be stably selected with a simple configuration.

[Brief description of drawings]

FIG. 1 is a block diagram of a transmission unit of a wireless data communication device showing an embodiment of the present invention.

FIG. 2 is a block diagram of a receiving unit of a wireless data communication device showing an embodiment of the present invention.

FIG. 3 is an overall schematic diagram of a wireless data communication device showing another embodiment of the present invention.

FIG. 4 is a waveform diagram of a tone signal, a data signal and a mixed signal used in the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Transmitter of wireless data communication apparatus 2 Processor 3 Interface section 4 Transmitted data modulator 5 Mixer 6 Tone selection signal (SEL) 7 Tone signal generator 8 Tone signal 9 High-frequency transmitter 10 Transmitting antenna 11, 11a, 11b, 11c Receiver of wireless data communication device 12 Receiving antenna 13 High-frequency receiver 14 Received signal 15 Received data demodulator 16 Received data selector 17 Tone Signal detection circuit 18 SEL signal (selection signal) 19a, 19b, 19n Terminal

Claims (1)

[Claims] 1. A transmission unit which is connected to a processing device and which transfers data, and a reception unit which receives the transferred data and selects and outputs a designated terminal device. In the wireless data communication device, the transmitting unit is provided with a circuit for generating a tone signal of a plurality of frequencies which can be arbitrarily changed from the processing device or the outside in order to select a communication partner, and the selected type is selected. The tone signal of the frequency is added to the data signal and transmitted, and the receiving unit detects the tone signal from the received signal and selects it according to the frequency type of the detected tone signal. Wireless data communication switching system, characterized in that a means for outputting a received data signal is provided only to the established terminal device.