JPS5913454A - Transmitting and receiving method of data - Google Patents

Abstract

PURPOSE:To transmit data by a highly reliable and economical device with high transmission efficiency of data, by expanding the basic unit of transmission up to 4 bits. CONSTITUTION:The circuit is obtained by adding one signal to 6 signals of ordinary multi-frequency signals. When two switch driving relays of the switch driving relays 41-47 are simultaneously actuated on the basis of a command from a control device 1, two switches corresponding to said relays of the switches 31-37 are closed and two kinds of signals are outputted to an output terminal 6 through a resistor 5. Therefore, 21 kinds of numeral codes can be transmitted by combining 2 signals of 7 kinds of signals. If hexadecimal numbers are previously assigned to said combination, a hexadecimal number can be transmitted as it is as a multifrequency signal. Although said example shows the circuit obtained by adding one signal to the ordinary 6 signals, 21 kinds of combinations using 2 signals and one signal and 20 kinds of combinations using 3 signals can be obtained by using conventional circuits adopting 6 signals.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data transmission and reception system for transmitting and receiving multi-frequency signals such as selection signals related to telephone connections between telephone offices.

The multifrequency signaling system currently used between telephone exchanges is used for transmitting and receiving selection signals, but it is clear that it can also be used for transmitting and receiving general data.

However, the conventional numerical code using multi-frequency signals uses a combination of two signals out of six frequency signals, so it is limited to a maximum of 15 types, two of which are:
It is used as a data transmission start control code and a data transmission stop control code, and the remaining 15 types can be used as numeric codes. Incidentally, 10 types of decimal digits from 0 to 9 are currently used.

By the way, in the conventional multi-frequency signal system, a system for transmitting and receiving large amounts of data that requires high reliability has not been realized. It is common for the transmitting side to divide the data into 6-bit units and transmit them using octal digits O to 7, and then to restore the octal digit code to hexadecimal digit code on the receiving side.

However, this case has the following drawbacks.

(1) A function to convert hexadecimal data to octal data and octal data to hexadecimal data is required on each of the sending and receiving sides.

(2) Transmission unit by multi-frequency signal 1 numeric code is 3
Due to the octal representation of pits, transmission efficiency is poor.

In addition, the transmission and reception of large amounts of data is generally achieved by providing a transmission function such as a common line method or a data link based on the EDLC procedure, and in this case, it is necessary to provide these data transmission devices separately. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a data transmission/reception system using multi-frequency signals, which has excellent data transmission efficiency and reliability, and can transmit data with an economical device.

In order to achieve this objective, the main feature of the present invention is to expand the basic unit of transmission to 4 bits.
The reason is that hexadecimal numeric codes can be sent and received as they are.

Another feature of the present invention is that when transmitting and receiving hexadecimal digit data in units of data blocks arranged in 4 rows and m columns,
The purpose is to add hexadecimal digits in each row and column direction, and add the addition results for transmission and reception.

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

FIG. 1 is a conceptual diagram of an example of a multi-frequency signal generation circuit for realizing a data transmission/reception system according to the present invention.

In the figure, 1 is a control device, 11-17 are seven types of signal sources, 21-27 are resistors, 51-67 are switches, 41-4
7 is a switch drive relay, 5 is a resistor, and 6 is an output terminal.

This circuit has one signal added to the six conventional multifrequency signals, and other than that, it is no different from the conventional circuit.

Next, the operation of this circuit will be explained.

Based on the command from the control device 1, the switch drive relay 4
By simultaneously operating two of the switches 1 to 47, the corresponding two of the switches 61 to 37 are closed, and two types of signals are outputted via the resistor 5 to the output terminal +6.

Therefore, by combining two signals out of seven types of signals,
21 types of numerical codes can be sent, 16 in advance.
Assign base digits to the above combinations (from 1
Hexadecimal digits can be transmitted directly as N multi-frequency signals.

In addition, in the above example, an example of a circuit in which one signal was added to the conventional six signals was shown, but by using the conventional six signal circuit, two signals can be added.
It is also possible to realize 21 types of combinations of signals and 1 signal or 20 types of combinations of 5 signals.

FIG. 2 shows a check code creation method for detecting code errors missed by the conventional 2-mount-op-6 check in hexadecimal code transmission according to the present invention. As shown in Figure 2 (α), on the transmitting side, a data array consisting of hexadecimal data α, ~eL1...h1~h8, 8 numbers x 8 numbers/N = 64 numbers is used as a unit. shall be transferred as such.

The above-mentioned data are divided into α1 to α8...h1 to h8 and cl Al to horizontally and vertically, respectively.
h1...(Ls Add 8 numbers consisting of hs to h8, and calculate each addition result as 16XrL-1(
t't=1, 2-8) Margin q] Obtain the next numerical code A-P (o<A~P≦15).

,'f=16X Roux 1-! α1 L=1 B = 1 (S XtL -1-, J tri-1 1i=　16xn-1-,'l　ht l=1 I=16×rL−1−1ΣL.

t Rami P=ISXW-1-18 Based on that, as shown in Figure 2 (bl and (cl), create the code for checking the horizontal direction of A-H and the code for checking the vertical direction of 1-P. The code is added to the end of the data block and transmitted.On the receiving side, an oversight error during transmission is detected by checking using the inverse theory of the above-mentioned theory.

FIG. 3 shows the configuration of an example of a check code creation circuit for adding the above-mentioned check code.
72 is a readout circuit; 73 is a central control unit; 74 is a readout control circuit; 75 is an addition circuit in horizontal 4-bit units;
77 is a counter control circuit, 78 is a check code storage circuit, 79 is a transmission data storage circuit, 80 is a signal transmission circuit, 81.82 is a NOT gate, 83 to 86 are AND gates, 87 is or gate.

The function of the circuit shown in FIG. 3 is to cut out the data stored in the signal sending memory 71 word by word, add a check code, and transfer the data to the signal sending circuit 80.

Specifically, in the readout control circuit 74, the central control unit 1
A transmission start signal is received together with the data address, and the reading circuit 72 is instructed to read the contents of the transmission target block address 00 of the memory 71. At this time, the counter value of the counter control circuit 77 is O.

One word worth of data read from the memory 71 is input to a sending data storage circuit 79, an addition circuit 75 in units of horizontal 4 bits, and an addition circuit 76 in units of 4 vertical pits. In the horizontal addition circuit 75, one word of data (32 bits)
The 8 numerical data (4 bits) are each added, and the lower 4 bits of the addition result are inverted by the NOT gate 81 and input to the AND gate 86. In addition, the vertical addition circuit 7
In No. 6, eight numeric data in one word of data are stored separately, and addition is performed for each numeric data each time data is input.

A gate signal from the counter control circuit 77 opens the AND gate 83 and stores the check code in horizontal 4-bit units in the storage circuit 78 . Further, when the addition of all the data blocks is completed, the vertical check code inverted by the NOT gate 82 is input to the check code storage circuit 78 via the AND gate 84 in response to a gate signal from the counter control circuit 77.

The storage circuit 78 performs data sorting each time a horizontal check code is input, and then sends a counter update signal to the counter control circuit 7 in preparation for the next data read.
Enter 7. In response to an instruction from the counter control circuit 77, the read control circuit 74 instructs the read circuit 72 to read the next data.

This operation is repeated for one data block (8 words).

The data read from the sending data storage circuit 79 is input to the signal sending circuit 80 via the AND gate 86 and the OR gate 87 by opening the AND gate 86 in response to a gate signal from the counter control circuit 77, and is transmitted from there. do.

On the other hand, due to the gate signal from the counter control circuit 77,
After sending the final data of the data block, the AND gate 85
is opened, and the check data 71-B and 1-P stored in the check code storage circuit 78 are input to the AND gate 85.
The signal is inputted to the signal sending circuit 80 via the OR gate 87 and transmitted from there.

In the signal sending circuit 80, when the sending of one data block is completed, the counter control circuit 77 is initialized, and
An instruction to the effect that the next data block can be accepted is given to the read control circuit 74 to prepare for data processing of the next data block.

It goes without saying that the above-mentioned check code creation can also be realized using program theory.

As described above, according to the present invention, a large amount of data using multi-frequency signals is transmitted and received in hexadecimal digits.
In a bit transfer unit, the number of transfers is 40, but in a 4-bit transfer unit like the present invention, it is 60 times, which improves the transmission capacity by about 1/4 compared to the conventional method. 16 which is the basic unit of data processing in computers
Since the hexadecimal numeric code and the basic unit of transmission are the same, there is an advantage that a device for encoding and decoding as an interface function between the two is unnecessary.

Furthermore, since a code error detection method has been introduced that has a detection efficiency ratio for transmission errors, highly reliable data transmission and reception using multi-frequency signals can be realized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a multi-frequency signal generation circuit that realizes the data transmission/reception method according to the present invention, FIG. 2 is a diagram explaining the principle of the check code creation method according to the present invention, and FIG. FIG. 2 is a configuration diagram of an example of a circuit that implements the method. 11 to 17...Signal sources 31 to 37...Switch 6...Output terminal agent Patent attorney Usui 1) Kosai Ri 1 Figure O 2 Figure D 7
ABCD 1 ■ Block + 3 Drawing procedure amendment (method) Display of the case 1982 Patent Application No. 121161 Name of the invention Data transmission/reception method amendment person 2, -'c "" stock stand f1 manufactured by Hitachi (where 1i 8 3 1) Shigeru Katsu (and 1 other person) Contents of the person amendment As shown in the attached sheet 2/--\2 mouth

Claims (1)

[Claims] 1. In a data transmission and reception system that transmits and receives numerical codes using multi-frequency signals, the basic unit of transmission is 4 bits, and 1
A data transmission and reception method characterized by transmitting and receiving hexadecimal numeric codes. When transmitting and receiving data blocks in which 21 hexadecimal digit data is arranged in 1 rows and m columns, hexadecimal digits are added in each row and column direction, and the results of these additions are added before transmission and reception. A data transmission/reception system according to claim 1, characterized in that: