JPS62159975A - Controller for radio data communication - Google Patents

Abstract

PURPOSE:To transmit an information signal securely and automatically without losing the effective part of the information signal to be transmitted by instructing a unidirectional radio equipment to transmit the signal before the prescribed period, prior to transmitting at least the effective part of the information signal. CONSTITUTION:A facsimile equipment 10 and the radio equipment 50 are interfaced by a transmission data signal TXD and a control signal CNT setting the radio equipment 50 usually in a reception state to a transmission one. When a sequence signal is transmitted, the facsimile equipment 10 sets the control signal CNT given to the radio equipment 50 at a high level H, and gives the transmission data signal TXD to the radio equipment 50 after the prescribed time (t) passes. The prescribed time (t) is set to a delay time until the radio equipment 10 actually rises with the control signal CNT given, that is, it can be substantially equal to a time t1. Thus the transmission data signal TXD such as a sequence signal is surely transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a data communication control system, and more particularly to a control device for wireless data communication.

BACKGROUND ART In general, in a unidirectional wireless communication system, two radio devices use the same frequency, and a station that wants to transmit transmits a signal on that frequency. For example, if one of the radios is in the transmitting state, that is, when transmitting audio, etc., and the radio, which is normally in the receiving state, is turned into the transmitting state by operating the breath talk switch attached to the microphone, the frequency Can transmit radio waves. When the other station transmits, it puts its own radio into the transmitting state by performing the same operation. If both are in the transmitting state at the same time, communication will not be possible.

In this way, in unidirectional wireless communication, it is necessary to put the wireless device on the side that wants to transmit into the transmitting state. In order to perform data communication such as facsimile communication using such radio equipment, it is necessary to automatically control the switching of the transmission state in order to send and receive complex and various procedure signals for connection settings. preferable. In this case, it is necessary to prevent both devices from being in the transmitting state at the same time, and on the signal sending side, the timing of the period in which the radio is in the transmitting state and the period in which data is sent out must appropriately match. Furthermore, from the point of view of communication efficiency, it is advantageous to shorten this switching time.
On the other hand, accuracy and reliability are required for data transmission and reception.

By the way, when a data communication device such as a facsimile is connected to a radio and one-way communication switching control is performed, the data communication device sends a control signal to the radio to put the radio in a transmitting state, and then the radio is in a state where it can actually transmit. Since there is a time delay between the rising edge of the transmitting wireless device and the detection of the received signal by the receiving FI line device, the transmitted signal at the rising edge of the control signal may not be recognized as a normal received signal on the receiving side. Sometimes it cannot be detected. This ensures accuracy in data transmission and reception.
There will be a lack of certainty.

OBJECTS It is an object of the present invention to provide a highly operable wireless data communication control device that eliminates the drawbacks of the prior art and realizes reliable and accurate data communication.

Configuration According to the present invention, in order to achieve the above object, the device is always in a state where signals can be received using radio waves of a predetermined frequency,
A radio device that responds to a control signal and makes it possible to transmit a signal using radio waves of a predetermined frequency; data communication means receives a signal from the radio means, and the data communication means transmits at least a valid portion of the signal to be transmitted to the radio means after a predetermined period of time has elapsed since transmitting the control signal to the radio means. The wireless data communication control device is characterized in that the predetermined time is set to a length that includes at least the time required for the wireless device to start up upon receiving the control signal.

Note that in this specification, the term "data" is interpreted not only in a narrow sense of digital data but also in a broad sense, including analog format image information such as facsimile information, audio information, and the like. Hereinafter, a detailed explanation will be given based on one embodiment of the present invention.

Referring to FIG. 1, there is shown an embodiment in which the present invention is applied to facsimile communication. In this embodiment, a facsimile device (FAX) 10 is connected to a radio device 50, and has a transmitting station TX, that is, a side that sends out image signals, a receiving station RX,
In other words, it constitutes a side that receives image signals. Radio 5
In this embodiment, 0 has the function of transmitting and receiving radio waves of the same frequency using the antenna 52, and performs one-way communication in which transmission and reception are not established at the same time, and is configured so that it is normally in a receiving state. It's fine to use one. The radio device 50 may be, for example, an MCA communication system in which there is a time restriction on the use of radio waves.

The facsimile device 10 is interfaced with the radio 50 using a transmission data signal TXD and a control signal CWT that changes the radio 50, which is normally in a receiving state, to a transmitting state. Further, the radio device 50 is interfaced with the facsimile device 1O by a received data signal RXD. Transmission/reception data signals TXD and R including facsimile image information
In this embodiment, XD is transmitted and received using a predetermined code modulation method in the baseband, for example, the voice band, approximately 30,082 to 3 kHz.

More specifically, in this embodiment, the radio device 50 may be a radio device that performs normal voice communication using a microphone input, and therefore, the data signals TXD and RXD are frequencies in the voice band, and the radio device 50 has a predetermined signal level and a predetermined signal level. The information is sent to and received from the facsimile machine 10 using impedance.

The radio 50 is always in a receivable state and receives the control signal G.
When NT becomes high level H, it enters the transmitting state.

In the transmitting state, a carrier wave in a predetermined band is modulated, for example, by FM, using the baseband transmission data signal TXD input from the facsimile machine 10 and transmitted from the antenna 52, and in the receiving state, the received radio wave from the antenna 52 is demodulated. It has a function of outputting the received data signal RXD to the facsimile machine 10 as a baseband received data signal RXD. Of course, when the transmission data signal TXD or the reception data signal RXD includes a communication procedure signal, this is processed within the facsimile machine IO.

When the facsimile device 1O performs facsimile communication using the wireless device 50, in this embodiment, the facsimile device 1O executes a protocol based on the G3 facsimile standard of CGITT Recommendation No. 30 as shown in FIG. 2 to set up facsimile communication with the other party. Has a function.

The procedure signal used in the protocol is transmitted with the radio device 50 in a transmitting state. The procedure signal is a facsimile machine.
O makes the judgment and controls the radio device 50 to either transmit or receive under the control of the facsimile machine 10.

wireless! The time relationship between the control signal CWT that puts +150 into the transmission state and the signal to be sent will be explained.

It takes a certain amount of time for the facsimile device 10 to output the control signal CWT and for the radio device 50 to change from the receiving state to the transmitting state. Further, the radio device 50 of the transmitting station TX enters the transmitting state, and after transmitting a signal, the radio device 50 of the receiving station RX
0 detects and demodulates the signal, and the facsimile machine 10
It also takes time for the signal to be input correctly.

For example, when transmitting DO3 and a modem training signal from the transmitting station TX, the facsimile device 10 outputs a control signal CWT to the radio 50, puts the radio 50 into the transmitting state, and transmits DO9 and the modem training signal to the signal line TXD. Output. During this time, the receiving station RX is in the receiving state.

As shown in FIG. 6A, if the transmission data signal TXD is sent at the same time as the rise of the control signal CWT, the transmission data signal TXD would be delayed due to the rise time t1 of the radio device 50 as shown in FIG. 6B. The data signal TX port will not be able to be transmitted normally. In other words, the signal during period tl is not sent normally,
Since the receiving station RX does not receive this correctly, it causes a malfunction of the device.

As a method for solving this problem, the control signal CN↑ is applied to the radio device 50 a time t earlier than the transmission of the transmission data signal TXD. Or, the transmission data signal T to be sent out
The control signal CNT may be raised a period t earlier than XD, leaving a period during which the receiving station RX recognizes it as valid. In the latter case, the period t before the valid period does not contain any valid signal content, and the receiving station RX does not detect the vertical part of the received signal RX as a valid signal.

More specifically, as shown in FIG. 4, when transmitting a procedure signal, the facsimile equipment 10 sets the control signal CWT transmitted by the radio 50 to a high level H, and after a predetermined time t has elapsed, A transmission data signal TXD, that is, a procedure signal in this case, is provided to the radio 50.

This predetermined time t is the length of the facsimile machine 1 on the sending side TX.
0 is set to be at least substantially equal to the delay time from when the control signal CWT is applied to the radio device 50 until the radio device 50 actually starts up, that is, the above-mentioned time t1. In addition, the time should be set to be substantially equal to the delay time from when the radio device 50 on the receiving side RX detects the received signal from the transmitting side TX until it actually becomes ready for transmission. It is even more advantageous. This ensures that the transmission data signal TXD, such as a procedure signal, is transmitted reliably.

Alternatively, as shown in FIG. 5, the transmission data signal T is sent from the facsimile machine IO at the same time as the control signal GNT rises.
An X port may be installed in the radio device 50 so that the radio device 50 can reliably transmit a portion for a valid period excluding a portion for a predetermined time length t from the start. In other words, even if the signal for a period of the predetermined length t is not received or detected, it is only necessary that the signal within the valid period is normally received and detected. For example, in the case of a procedural signal, this valid period is set to be longer than a specified time that has a meaning as a procedural signal.

Here, the predetermined time t is generally set to be substantially equal to the time delay from when the radio device 50 is activated by the high level H control signal CNT at the transmitting station TX until it actually becomes ready for transmission. However, since a time delay also occurs at the receiving station RX until the reception signal is detected, it is advantageous to set the length to include this time.

In this embodiment, after the communication connection with the other party is established, the facsimile machine IO reads image information from the document, compresses and encodes it using a predetermined encoding method, and modulates it using a predetermined modulation method. and transmit data signal T to the radio 50.
It has a function to send out as XD. It also has a function of demodulating the facsimile signal RXD received by the radio device 50, decoding it according to the same predetermined compression encoding method, and recording it on a recording medium as a visible image. In this embodiment, these include CCIT? Encoding methods, decoding Northern 1 methods, modulation methods and demodulation methods in accordance with the Recommendation G3 standard are advantageously applied, the flow of the protocol being illustrated in FIG.

Among the functions of such a facsimile machine 10, the device components that realize the functions related to the present invention are shown in FIG.
The image signal from the document reading section of this device is transmitted to a modem (MOD)
EM) 12 is input to input 14.

The modulator/demodulator 12 is a modulator/demodulator that modulates a facsimile signal to be transmitted using a predetermined modulation method and also demodulates a received facsimile signal. Note that the functional units on the receiving side are not illustrated because they are not directly related to the understanding of the present invention.

An output 16 of the modulator/demodulator 12 is connected to a terminal 20 for outputting a transmission data signal TX through an OR game (OR game) 1B. Terminal 20 is connected to a transmission data signal input terminal of radio 50.

This device also has a procedure signal sending section 22 for controlling the sending of one communication procedure signal, and its output 24 is connected to the other input of the OR game 1B.

The functions and operations of these various parts within this device are unified and controlled by the system control section 28. The system control 28 is advantageously constituted in this example by a processing system, such as a microprocessor. System control unit 2
8 is an activation signal CN for putting the radio 50 into a transmitting state.
A start signal GNTAI for operating TA and modem 12 is generated at terminals 30 and 32, respectively.

Both terminals 30 and 32 are connected to the control signal generator 3B via an OR gate 34.The control signal generator 3B has an output 38 connected to the radio 5.
This is a functional unit that generates a control signal (JT) at a predetermined signal level to the radio 4I!50, which is connected to the transmission control terminal of the radio 4I!

Terminals 30 and 3 of activation signals CNTA and CMTAI
2 again. They are connected to the procedure signal sending section 22 and the modulator/demodulator 12 via the delay section 40, respectively. Delay section 40
have a function of delaying activation signals CMTA and CNTAI applied to inputs 30 and 32, respectively, by the aforementioned delay time t, and outputting the delayed activation signals as activation signals CMTB and CNTBI, respectively. As will be seen from now on, the procedure signal sending section 22 and the modem 12 receive the activation signals CNTA and CNTA from the system control section 28, respectively.
It is activated with a delay of time t from the occurrence of I.

The system control unit 2B of the transmitting station TX calls the receiving station through the radio 50. In response, the receiving station RX sends a CHD (called station identification) signal to the transmitting station TX under the control of the system control unit 28. and then DIS
(digital identification) signal back.

These CHD and old S signals are sent out at the predetermined time t mentioned above, as shown in FIG. More specifically, the system control unit 28 of the receiving station RX, for example,
When transmitting the ED signal, first the activation signal CNTA is set to a high level H. This activates the control signal generating section 3B through the OR gate 34, whereby a high level H control signal CWT is input from the control terminal 38 to the radio device 50 of the receiving station RX. As a result, the radio device 50 is activated and becomes ready for transmission.

On the other hand, the delay unit 40 delays the activation signal CMTA by a predetermined time t to form the activation signal CMTB, thereby activating the procedure signal sending unit 22. Therefore, the procedure signal sending unit 22 generates a procedure signal in that sequence, that is, a CEII signal in this example, which is an OR game) 1B
The output 20 is applied to the radio 5o as a baseband transmission data signal DX. The system control unit 28 uses the activation signal CN for a predetermined period (corresponding to the valid period in the example of FIG. 5) necessary for identifying the CHD signal.
Keep TA at high level H. During this time, the radio device 50 maintains the transmitting state.

In this way, the CED signal and the DIS signal are transmitted from the radio 50 of the receiving station RX toward the transmitting station TX. Transmitting station T
The system control unit 28 of X
When a signal is detected, a DO3 (digital command) signal is sent out in response. This C8 signal is also transmitted to the receiving station RX.
The information is sent in the same manner as described above. That is, in this embodiment, as described above, the control signal CM is transmitted after a predetermined time t from the rising edge to the falling edge.

Thereafter, the system control unit 28 of the transmitting station TX transmits a predetermined modem training pattern signal to the receiving station in the same manner as a normal facsimile transmission control procedure, and
The X modem 12 is trained. This training pattern is transmitted as follows.

The system control unit of the transmitting station TX first receives the activation signal CNTA.
Set I to high level H. This activates the control signal generator 3B through the OR gate 34, thereby causing the transmitting station TX
A control signal CWT at a high level H is inputted from the control terminal 38 to the radio device 50 . Then, the radio device 50 is activated and becomes ready for transmission.

On the other hand, the delay unit 40 transmits the activation signal CMTAI for a predetermined time t.
The activation signal 0NTBI is formed by delaying the modem! Start 2. Therefore, the system control unit 2
8 generates a pattern signal in the training sequence, which is given as a baseband transmission data signal TXD from the output 20 to the radio 50 through the OR game) 1B. The system control unit 28 keeps the activation signal CNTA at a high level H only for a predetermined period necessary for this training. During this time, the radio device 50 maintains the transmitting state.

When the receiving station RX completes training, its system control unit 28 sends a CFR (reception readiness confirmation) signal to the transmitting station T.
Return it to X. In the transmitting station TX, when the system control unit 28 detects a CFR signal, the radio device 50 is activated in the same manner as described above.
is brought into a transmitting state, and the modulator/demodulator 12 is activated by the delay unit 40 after a predetermined period t. The system control unit 28 starts reading the original image information, and the image information read from the original, that is, the message, is sent to the modem 12.
The data is compressed and encoded, assembled into a transmission frame, modulated, and sent through the OR gate 18 to the radio 50 as a transmission data signal TX port. This is transmitted from the radio 50 to the receiving station RX.

At the receiving station RX, this message is received by the radio device 50, demodulated by the modulator/demodulator 12, deframed, encoded and reproduced, and finally output as a hard copy on recording paper.

In this embodiment, the image information message for one unit, that is, for one page in this embodiment, is thus transmitted from the transmitting station. If the next transmission document does not exist, the system control unit 28 of the transmitting station TX sends an EOP (end of procedure) signal in the termination process. This EOP signal is also transmitted in the same manner as described above. In response, the receiving station RX sends the MC
F (Message confirmation) Returns the signal. Transmitting station TX
When it detects the MCF signal, it sends a DCN (disconnect command) signal back to the receiving station RX to restore the connection.

It goes without saying that the present invention can be effectively applied to data transmission as well as facsimile communication.

Effects According to the present invention, the transmitter is configured to instruct the transmitting state of the wireless communication device during a predetermined period of time prior to transmitting at least the effective part of the information signal. Therefore, it is possible to reliably and automatically transmit information signals, including communication procedure signals, without losing the effective part of the information signal to be transmitted using a #1 communication radio. can. Therefore, wireless data communication with high reliability and operability is realized.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing an embodiment in which the present invention is applied to a facsimile machine, and FIG. 2 is a functional block diagram showing an embodiment in which the present invention is applied to a facsimile machine.
, 30 is a flow diagram showing an example of a facsimile communication control procedure according to the 03 facsimile protocol. FIG. 3 is an explanatory diagram showing a specific configuration example of a part of the apparatus shown in FIG. 1. 4, FIG. 5, and FIGS. 8A to 8C are waveform diagrams for explaining the operation of the embodiment shown in FIG. 3. Explanation of symbols of main parts 10, . . ., facsimile device 12, . . . modem 22, . . . procedure signal transmission rh section 28, . . . system control section 30, . . . control signal generation section 400. , delay section 50, , radio device

Claims (1)

[Scope of Claims] Radio device means that is always in a state in which it is capable of receiving signals using radio waves of a predetermined frequency and is in a state in which it is able to transmit signals using radio waves of the predetermined frequency in response to a control signal; data communication means connected to the radio means for providing signals to be transmitted to the radio means and receiving signals received by the radio means from the radio means; After a predetermined period of time has elapsed since the signal is applied to the radio means, at least an effective part of the signal to be transmitted is provided to the radio means, and at least during the predetermined period, the radio means receives the control signal. A control device for wireless data communication, characterized in that the length is set to include the time required for startup.