JPS61208944A - Data communication equipment - Google Patents

Abstract

PURPOSE:To attain data communication immediately by sending an initial identification signal for setting communication procedure after start of data communication is commanded and a significant signal from correspondence opposite party is detected within a prescribed time so as to reduce the time required for communication procedure. CONSTITUTION:When a start button 39 is depressed and the manual reception is commanded, a control circuit 44 generates a signal commanding the start of data communication operation. A signal presence detecting circuit 32 detects the presence of a signal sent from a sender side facsimile equipment for a prescribed time by using the said command signal. No initial identification signal is sent within the said prescribed time. Thus, no signal collision exists and the signal from the sender side is received surely. When a significant signal is not detected within a prescribed time, a normal initial identification signal is sent from an NSF/DIS signal sending circuit 36 and the mode transits to the normal reception mode. When a significance signal is detected in the circuit 32 for a prescribed time, after the digital identification signal DIS at the sending side is received, the initial identification signal representing a transmission instruction is sent from an NSC/DTC signal sending circuit 34.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a data communication device that transmits or receives image data, code data, and the like.

<Prior Art> Conventionally, this type of data communication device, such as a facsimile machine, has an automatic reception mode in which an original image is received without operator intervention, as well as a manual reception mode in which an original image is received with operator intervention. is normal. There is a normal manual reception mode in which an operator intervenes on the sending side, and a normal manual reception mode in which the sending side is accessed from the receiving side without operator intervention, and the original placed on the sending side is automatically transferred to the sending side. There is a manual polling reception mode in which the reading and receiving side receives the scanned image.

Further, the 7-axis IJ device normally communicates the communication mode of its own device to the other device as an initial identification signal in order to set a communication mode such as the same communication procedure and communication standard.

In manual polling reception mode, the sending and receiving sides send initial identification signals to each other, so the initial identification signals may collide on the line, causing each party to be unable to recognize the other party's initial identification signal and polling communication not being established. Ta. Also, even if polling is established and the signals collide,
The disadvantage is that the pre-procedure takes time. FIG. 1 shows a typical example in which when polling is attempted between conventional facsimile machines, initial identification signals collide and polling fails.

In FIG. 1, various signals are based on CCITT recommendation T30. 1 is the called station identification (CED) signal;
2 and 6 are preambles sent out prior to the transmission of binary signals; 3.7 is a non-standard function (N8F) signal; 4
is a called terminal identification (CHI) signal, and 5 and 8 are digital identification (DIS) signals. In Figure 1, on the automatic receiving side, the CBD signal is followed by NSF, C8I, and D.
Sends IS signals. After that, it starts receiving binary signals for 3 seconds. From the other party's facsimile machine,
When a group of digital command (DC8) signals (non-standard function setting (NS8) signal, transmitting terminal identification (TSI) signal, DO8 signal) is received, it goes to receive the training check (TCP) signal, and then the image Receive information. Also, from the other party's facsimile machine, a group of digital transmission command (DTC) signals (non-standard function command (NSC) signal, calling station identification (CIG) signal,
When receiving a DCS group signal (TC signal), it sends out a DCS group signal, and then performs polling transmission of image information. but,
As shown in Figure 1, when receiving a binary signal, the other party's facsimile machine does not send out a binary signal, so after 3 seconds, N8F, C3l-DIS
Transmits signals. After that, it starts receiving binary signals for 3 seconds. The above operation is performed for the initial identification time (e.g. 35 seconds)
is repeated until the timeout occurs, at which point the process ends with an error. On the other hand, the facsimile machine on the manual receiving side starts transmitting the initial identification signal when the operator presses the start button after hearing the CED signal. Here, the facsimile machine on the manual receiving side does not transmit the C8lgt signal.

In this case, first send the N5F-DIS signal, then 4
．． Head to receive the binary signal for 5 seconds.

When a DOS group signal is received from the other party's facsimile machine, the process proceeds to receive a training check (TCP) signal, and then receives image information. Also, from the other party's facsimile machine, the NSF signal of own machine,
A signal (bit 9 of the facsimile information field (PIF) is 1, that is, there is a document to be transmitted) is received (C8l
(signals may or may not be received), a DTC group signal is sent, and then image information (polling) is received. However, as shown in Figure 1, when the binary signal is being received, the other party's facsimile machine does not send out a binary signal to be read in the preamble, so after 4.5 seconds the N8F-C8I. Transmits DI8 signal. After that, it starts receiving binary signals for 4.5 seconds. The above operation is repeated until the initial identification time (for example, 35 seconds) expires, and the process ends with an error at the time the time expires. In the above embodiment, the time of the initial identification signal sent by the automatic receiving side (the time from the start of sending the preamble signal to the end of the DIS signal) is α (seconds), and the time of the initial am signal sent by the manual receiving side is α (seconds). Let M (the time from the start of transmission of the preamble signal to the end of the DI8 signal) be β (seconds), and consider a case where the relationship α=β+1.5 holds. Actually, α=β+1.5
Although it is rare that α>β is possible. Furthermore, in the case of a facsimile machine having the functions of CCITT's T2 and T3 recommendations, a tonal signal is sent out before a binary signal, so polling operations are more difficult to perform than when only a binary signal is sent out.

On the other hand, if the other party's facsimile machine is transmitting manually, that is, in normal manual reception mode, the sending party cannot send anything until it receives the DIS group signal sent from the manual receiving facsimile machine. After receiving the DIS signal, the transmitting side sends out DC8 group signals. Therefore, unlike during polling, collision of initial identification signals does not occur, and normal image transmission is quickly performed.

Purpose of the Invention In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a data communication device that can shorten the time required for pre-communication procedures and quickly perform data communication.

Another object of the present invention is to provide a data communication device in which initial identification signals do not collide with each other.

Another object of the present invention is to provide a data communication device that can determine whether a polling reception mode or a normal manual reception mode is in the manual reception mode by checking the presence or absence of a significant signal from the transmitting side.

Another object of the present invention is to provide a data communication device in which the transmission timing of the initial identification signal is changed depending on the presence or absence of a significant signal from the transmitting side in the receiving mode.

According to the present invention, polling reception can be performed reliably and in a short pre-procedure period.

Other objects of the invention will become apparent from the drawings and the detailed description below.

<Example> The content of the present invention will be described in detail below based on the example shown in the drawings.

FIGS. 2 and 3 show examples of manual reception operations using the facsimile apparatus according to the present invention.

FIG. 2 shows a case where the other party's facsimile machine is in the normal manual reception mode in which transmission is performed manually. In Figure 2, 2
, 6, 7.8 are the same as in FIG. 9 is a non-standard function setting (N8S) signal, and 10 is a digital command (DC8) signal.

FIG. 3 shows a case where the other party's facsimile machine is set to automatic incoming call reception and is in manual polling reception mode in which polling transmission is performed. In Figure 3, 1, 2, 3, 4, 5
is the same as in Figure 1. 11 is a non-standard function instruction (NSC
) signal, and 12 is a digital transmit command (DTC) signal.

FIG. 4 shows a block diagram of an embodiment of a facsimile machine according to the invention.

In FIG. 4, since the telephone network is used for data communication etc., 20 is connected to the terminal of the line to control the connection of the telephone exchange network, switch to a data communication path, and connect the loop. A network control unit NCU (Network
ork ControlUnit). signal line 20
a is a telephone line.

22 is a hybrid circuit that separates a signal to be transmitted and a signal to be received. The transmission signal is sent from the signal Ma38a through the signal line 20b to the telephone circuit 20a. Further, the received signal passes through the signal line 20b from the telephone line 1I20a and is output to the signal line 22a.

24 inputs the signal of the signal line 22a, and when detecting the 2100Hz signal, the signal level rl is input to the signal line 24a.
It is a 2100 Hz detection circuit that outputs a signal of J and outputs a signal of signal level "φ" on the signal line 24aK when a 2 iooHz signal is not detected.

26 is a demodulator, which inputs the signal of the signal line 22a, and
The result demodulated by the modem is output to the signal line 26a.

28 is a flag detection circuit which receives the binarized binary signal output to the signal line 26a and generates a 2-byte continuous flag pattern, that is, "φ111111φ
When a pattern of φ11111.1φ is detected, a signal line 28aK pulse is generated.

A signal diffraction circuit 30 receives the binarized binary signal output as the signal $ 26 a, and generates a pulse in the signal II 30 a when a significant signal is detected.

Then, when the NSF signal is detected, the signal $130 b
When the C8I signal is detected, a 30cK pulse is generated on the signal line, and when the DIS signal is detected,
Generates a 30dK pulse on the signal line. Furthermore, every time the D/S signal is detected, the information on the 9th bit of the PIF of the DI8 signal (information on the presence or absence of a document) is output to the signal #J30e.

32 is a signal presence/absence detection circuit which inputs the signal output to the signal line 22a and detects the presence/absence of the signal. The signal presence/absence detection circuit 32 outputs a signal of signal level "1" to the signal line 32a when there is a signal (that is, a signal of -43 dBm or more has arrived at the receiver). There is no signal again (
That is, when a signal of -48 dBm or less has arrived at the receiver, a signal of signal level "φ" is output to the signal line 32a.

34 is an NSC/DTC sending circuit, and a signal la44
When a pulse is generated on signal line 34a, NSC/DT is connected to signal line 34a.
A C signal (sometimes an NSC/CIG/DTC signal; these three types of signals are referred to herein as "initial identification signal representing a transmission command") is transmitted.

36 is an NSF/DTC sending circuit, and when a pulse is generated on the signal line 44b, an NSF/DIS signal (sometimes an N8F/C8I/DIS signal is also sent to the signal line 36a); these three types of signals are referred to in this specification. is a "normal initial identification signal"
It is called. ).

38 is an adder circuit, which connects the signal of the signal line 34a and the signal line 3.
6a is input, and the added result is output to the signal line 38a.

39 is a start button with which the operator instructs the start of a manual communication operation.

40 is the signal line 44cK pulse is generated, 200m
This is a timer circuit that generates a pulse on the signal line 40a after 5 lapses.

42 is 10 after the pulse is generated in the signal 8144 d.
This is a timer circuit B that generates a pulse on the signal line 42a after seconds have passed.

44 is a control circuit that performs the control described below, and the CPU
, ROM, RAM, etc.

When the start button 39 is pressed and manual reception is instructed, a certain period of time is detected to see if there is a signal sent from the facsimile machine on the sending side, and during this time the receiving side does not send an initial identification signal. . Therefore, the signal from the transmitting side can be reliably received.

If no significant signal is received during this certain period of time, the second
As shown in the figure, "normal initial identification signal" (in this example, N
SF, DI8 signal) and shifts to normal manual reception mode.

On the other hand, when a significant signal is detected on the receiving side during the above-mentioned fixed time, as shown in FIG. Initial identification signal J (NSC
, DTC).

In Figure 5,! 11S4 diagram A flowchart of the control of the control circuit 44 is illustrated. The above operation will be explained in detail using FIG.

When the start button 39 is pressed and the manual reception mode is selected, the process advances to step 851.

In step S51, a pulse is generated on the signal line 44d, that is, a 10 second timer is started.

Next, in step S52, a pulse is generated on the signal line 44C, that is, a 200 ms timer is started.

Then, in step 854, it is determined whether the signal level is "1", that is, whether there is a significant signal from the transmitting side. Is there a significant signal?
-f--')-fQ l: OI/r'Jb
+ -1 TE 巳罎J"L"j-expression, the process advances to step 856.

In step 856, it is determined whether a pulse has occurred on the signal line 40a, that is, whether the 200m5 timer has timed out. 200 m without significant signal detected
When the s timer times out, step 88
4, transmits signals N8F and DIS, and shifts to normal manual reception mode (886).

On the other hand, if a significant signal is detected in step 854, the process proceeds to step 858.

In step 858, it is determined whether a pulse has occurred on the signal line 42a, that is, whether the 10 second timer has timed out. 10 second timer time step 884
Proceed to normal manual reception mode. If no pulse is generated in the signal M42a, that is, if the 10 second timer has not timed out, the process proceeds to step 860.

In step 860, it is determined whether a pulse is generated on the signal line 28a, that is, whether consecutive flags are detected. In other words, a continuous 7 pattern (preamble)
When detected, the process advances to step 868. Also, if continuous hook/2<turn is not detected, step 8
Proceed to step 62.

In step 862, it is determined whether the signal level of the signal line 24a is "1", that is, whether the signal CED of 2100 Hz is detected.

If a 2100Hz signal is detected, step 864
Proceed to. When the signal level of the signal @24a is "φ", that is, when a 2100 Hz signal is not detected, the process proceeds to step 852.

In step 864, it is determined whether the signal level of the signal line 24a is "φ", that is, whether a 2100 Hz signal is detected. The signal level of the signal line 24a is "1"
If the signal level changes from "φ" to "φ", the process proceeds to step 852, and if the signal level of the signal line 24a remains "1", the process proceeds to step 866.

In step 866, it is determined whether a pulse has occurred on the signal line 42a, that is, whether the 10 second timer has timed out. 2100) If a pulse is generated on the signal line 42a before the detection output of iZ becomes "φ" and the 10 second timer times out, proceed to step 884,
Sends signals NSF and DTC and shifts to normal manual reception mode.

On the other hand, when a preamble is detected in step 860, it is determined in step 868 whether the signal level of the signal line 32a is "1", that is, whether there is a significant signal. If a significant signal is detected, the process advances to step 870. On the other hand, if the signal level of the signal line 32a is "φ", that is, if no significant signal is detected, the process proceeds to step 882.

In step 870, a pulse is generated on signal line 44C to start a 200m5 timer.

In step 872, it is determined whether a pulse occurs in the signals M30b and 30d, that is, whether the NSF signal and the DIS signal are received. When the NSF signal and DIS signal are received, the process advances to step 874.

On the other hand, if the N8F signal and the DI8 signal are not received, the process advances to step S80. In step 874, the signal level of the signal line 30e is "1", that is, bit 9 of the FIF of the DIS signal is "1". will be judged. DI8 signal P I F
When bit 9 of is "1", that is, when an original is set on the transmitting side, the process advances to step 876, and the signal line 44
A pulse is generated at a, that is, an NSC/DTC signal is sent. Then, in step 878, the manual polling reception operation mode is entered.

On the other hand, if it is determined in step 874 that there is no document on the sending side, the process advances to step 884 and shifts to normal reception mode. Note that since no original is set on the sending side at this time, the communication line may be opened and the communication may be terminated.

In step 880, it is determined whether a pulse has occurred on the signal line 42a, that is, whether the 10 second timer has timed out. When the 10 second timer times out, the process advances to step S84. If the 10 second timer has not timed out, proceed to step 868 and set the NS
Continue detecting F and DI8.

In step 882, it is determined whether a pulse has occurred on the signal line 40a, that is, whether the 200 ms timer has timed out. When the 200m5 timer times out, the process advances to step 884. On the other hand, 200m
If the 5 timer has not timed out, the process advances to step S80.

In step 884, a pulse is generated on the signal line 44b, that is, the NSF/DIS signal is sent.

Step 886 represents proceeding to normal manual reception mode.

In the above embodiment, -4 is used to determine the presence or absence of a signal.
If a signal of 3 dBm or more is received, it is determined that there is a signal, and if a signal of -48 dBm or less is received, it is determined that there is no signal.

However, it is also possible to take background noise and the like into account and check whether there is continuity in the frequency of the received signal to determine the presence or absence of the signal. i.e. -43d
Even if a signal of B rn or more is received, if there is no continuity in the frequency of the received signal, it is determined that there is no signal.

Next, an example of using the start point 39 for both manual transmission and manual reception will be described with reference to the block diagram of FIG. 6 and the flowchart of FIG. 7.

In FIG. 6, parts having the same functions as those in FIG. 4 are given the same reference numerals. A recording unit 46 records the demodulated image signal from the demodulator 26 on recording paper. 47
is a reading unit that reads an original image and obtains a binary WI image signal. Further, 48 is a document detection circuit that detects whether or not there is a document at the reading preparation position of the reading section 47. 49 is a modulator that modulates the binary image signal.

At the time of transmission, the binary image signal read by the reading section 47 is modulated by the modulator 49, and then sent to the adder circuit 38 and the hybrid circuit 2.
2. Output to the telephone line 20a via the NCU 20.

On the other hand, at the time of reception, NCU20. The image signal sent to the demodulator 26 via the hype circuit 22 is recorded in the recording section 46.

The operation of the above configuration will be explained with reference to the chart 70 in FIG.

At step 850, as in FIG. 5, it is detected whether the start button 39 is on, and if it is on, the original detection circuit 48
The output is checked to determine whether the document is in the read preparation position. If there is a document, the device shifts to transmission mode and transmits the document image.

On the other hand, if there is no document, it is determined that the mode is manual reception mode, and the process proceeds to step 851. Steps 851 to 886
The operations of 851 to 886 in FIG. 5 are exactly the same, so the explanation will be omitted.

Effects> As explained above, according to the present invention, signals do not collide with each other as in the past, not only during normal manual reception operation but also when performing polling reception, and the 1 It has become possible to recognize the first initial identification signal, and after recognition, it has become possible to immediately send out an initial identification signal representing a transmission command. Furthermore, manual normal reception and polling reception can be performed with one button without providing a button for polling C request '3.

In the above embodiments, a facsimile device that transmits and receives images has been described as an example, but the present invention is of course applicable to other data communication devices that transmit and receive text codes.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of a procedure in a conventional facsimile machine, FIGS. 2 and 3 are explanatory diagrams showing an example of a procedure in a facsimile machine according to the present invention, and FIG. FIG. 5 is a flowchart showing the control procedure of the control circuit 44 shown in FIG. 4, and FIG. 6 is a control block diagram of the 7-axis IJ device. FIG. 7 is a flowchart showing the control procedure of the control circuit 44 of FIG. 6. In the figure, numeral 32 indicates a signal presence/absence detection circuit as a detection means, 36 a N8F/DI8 signal sending circuit as a sending means, and 39 a start button as a command means.

Claims (1)

[Claims] command means for instructing the start of a data communication operation; detection means for detecting a significant signal from a communication partner device for a predetermined period of time after the command from the command means; 1. A data communication device comprising a sending means for sending an initial identification signal for setting a data communication device.