JPS5917754A - Method and device for transmission of computer data - Google Patents

Abstract

PURPOSE:To eliminate the trouble of laying a private line for data transmission and reception and conform the device to the extension of terminal equipments, by transmitting the data signal between a computer and plural terminal equipments through an AC power supply line. CONSTITUTION:In case that various kinds of information from plural automatic weaving machines 1 are sent to a computer 2, they are sent from terminal equipments 7 on the weaving machine side through an AC power supply line 6 in a plant. In respect to a data signal 15, a carrier signal 24 of a certain frequency is transmitted intermittently as two kinds of data signal 15 different by duration in accordance with the code of the signal 15. In a receiving part 27 of the computer 2, signals having a duration shorter than a duration t2 of the shorter signal 15 are cut forcibly. Thus, a noise 26 of a short time which is superimposed upon the power supply line is eliminated, and the data signal 24 is shaped and is detected as a binary code, and this data is processed by the computer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for receiving and transmitting data between an electronic computer and a terminal device.

Conventionally, in this type of data transmission, it was essential to run a dedicated line between the computer and the terminal device, and to keep the line away from the noise source to prevent noise from entering. It was thought that the condition was Particularly in factories where a large number of power equipment are used, the noise emitted from these equipment is orders of magnitude more intense than in general office buildings, which poses many problems in ensuring reliable data transmission.

In addition, in newly constructed factories or buildings, lines dedicated to data transmission are often installed in advance, taking into account the location of equipment, but it is not possible to immediately respond to the expansion of equipment, and furthermore, such lines are installed in existing factories. If you try to stretch it out, you will not only be able to place it in a difficult position, but you will also have problems such as the line getting in the way and breaking the line if it falls a little.

The inventor has conducted repeated research into the above problem.

AC power lines, which are known to be a source of traffic noise and people tend to avoid using them for data transmission or even getting close to them, are now strung throughout the building and connected to each other, creating the risk of disconnection. It was discovered that this method is suitable for data transmission within a small area, and can also reduce the effects of noise.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method that can easily accommodate the addition of terminal devices by using an AC power line for data transmission between a multiplex computer and a terminal device, without constructing a dedicated line. .

A further object of the present invention is to provide a suitable apparatus for carrying out the above method.

The present invention will be specifically described below based on an embodiment shown in one drawing.

FIGS. 1 to 3 show a plurality of automatic looms 1 (the illustrated example shows 10 machines for convenience of explanation, but it can be implemented similarly with several hundred machines or more) and an electronic computer 2. An example in which the present invention is implemented when data is collected using A three-phase or single-phase AC power line 6 drawn into the factory 5 from the high-voltage power transmission line 3 via the 1-lance 4 is laid out in a mesh pattern inside the factory 5, and supplies power to each loom 1. ing.

From the looms 1 installed in the factory 5, the operating status of the machine obtained from the opening/closing status of various on/off switches such as start and stop, control relays, etc., and the number of rotations of the shaft per rotation, and such operations. Various information indicating the time at which the error occurred is taken out as input data to the computer 2. This data is the terminal device 7
The signal is processed by and sent to the AC power line 6.

The terminal device 7 uses a shift register 9 for pinot 1 as a data memory, as shown in FIG.
The data of the loom 1 inputted to the terminal device 7 is inputted manually to the data converter 10 and converted into a parallel binary number of n bits or less in accordance with the shift register 9. This data is temporarily recorded in the data transfer section 11, and is set in advance when there is a change in the output data from the loom 1, such as when the loom 1 stops, or when the input value exceeds the set value. When the condition is satisfied and it is detected that the data in the shift register 9 has been sent out, the data is input to the lower hint side of the shift register 9 via the data transfer section 11.

At the same time, a signal is sent to the star] pulse generator 12, and a transmission start pulse 13 is taken out from the start pulse generator 12 to indicate the timing to start data input. The transmission start pulse 13 is manually input to the transmission check section 14, but at the same time, the transmission check section 14 receives an AC signal.
The data signal '1) 15 flowing through the power supply line 6 is selected by the receiving section 16.
When it is detected that the data signal 15 is flowing through the ΔC power line 6, the stop signal 17 is inputted. In other words, even if new data has been input to the shift register 9 and the data is ready to be sent, the start pulse 13 cannot be changed to a shift pulse while data is being output from another loom 1 to the AC power line 6. By leaving the data on standby without sending it to the generator 18, the data from each loom is intermittently sent onto the AC power line 6 without being superimposed.

The data of each loom can be easily distinguished in the electronic division 1a2. The waiting time in the transmission check section 14 can be changed as appropriate using a dip switch 19, etc., and data transmission priorities are set for each loom 1 based on the frequency of use or past failure rate, and the data transmission priority is set corresponding to the priority. Different waiting times are set for each.

There is no output of the stop signal 17 from the selection receiving section 16, or the waiting time diameter ii! from the disappearance of the stop signal 17! 1 later, the transmission start pulse 13 is sent to the shift pulse generator 18, and the shift pulse generator 18 generates pulses equal to the number of pins in the shift register 9, drives the shift register 9, and converts the data signal 15 into AC. It is sent out onto the power line 6.

For example, as shown in Figure 4, while the third loom is sending data,
The eighth loom starts first, then the second loom starts sequentially] - Even if it becomes possible to send data by outputting pulses 13 and 13, the data signal of the third loom is detected in the second selection receiving section 16 and the stop signal 17 has been input to the transmission check unit 14, so both the second and 8111i machines remain in a standby state without transmitting data. Here, the data transmission priority is set to 1st order N! A If the delay time is set to delay the sending of data, the second loom of the two waiting looms on the right will receive the data at the 2nd p1-1st after the 3rd loom finishes sending the data signal. At this time, unless the first loom with a higher priority is preparing to send data, this data is sent onto the AC power line 6. At the same time, the transmission check and recess of each loom 1] 4 is reset and enters the standby state, and after the third loom finishes sending data, 8
Even when the time has come for the eighth loom of the B/l-th to send data, no data signals are sent from any other looms than the second loom.

While the second loom is transmitting data, the tenth loom. 9th. Even when the first loom enters the standby state sequentially, the priority order is followed in the same way as above. 8th. 9th. The data is sent out onto the AC power line 6 in an orderly manner in the order of the 10th loom, without any data overlapping.

After inputting the start pulse 130, the shift pulse generator 18 sends shift pulses equal to the number of bits in the shift register 9 to the shift register 9, and takes out the data in the shift register 9 as a serial signal. The shift register 9 is configured in advance so that the machine number 21 can be inputted in the upper few bits by a dip switch 20 or the like, and the serial data signal taken out from the shift register 9 has the machine number 21 (mathematical number 21) at the beginning. did.

A series of borrows equal to the number of bits in shift register 9' group 2
2 and is sent to the modulation section 23 (FIG. 5(a)).

The modulation unit 23 converts the carrier signal 24 having a constant frequency and amplitude into the input data signal as shown in FIG. 5 (bl).
1”, intermittent corresponding to “o”, duration is L
Two types of modulation signals, long and short, 1 and t2 are formed. The frequency f of the carrier signal 24 and the time t of 1 pin 1 minute can be selected depending on the degree of the noise signal 26 generated in the ΔC power line 6 that transmits the modulated signal, and 1
Ull transmission frequency r is 400 kHz to several 10 MHz
One frequency in z corresponds to one via t·min, and the data transmission interval is appropriately selected from a value in the range of 10 to 50 msec. The data signal 15 sent onto the AC power line 6 is returned to the original data by a receiving section 27 provided on the input side of the electronic II calculator 2, and is sent into the electronic computer 2 as processed data.

As shown in FIG. 3, the receiving section 27 uses a selective receiving section 28 tuned to the narrowed-down frequency of the take signal 15 to select necessary signals from among the various signals on the AC@iM line 6. Only the data signal 15 is extracted (FIG. 5(C)).

Since it contains a large amount of pulse-like noise signals 26 generated when motor brushes or switches are opened and closed, it is sent to a noise removal section 29 to remove this noise signal 26.

The noise removal unit 29 includes an integrating circuit, and is characterized in that it removes the noise signal 26 by cutting all signal portions whose duration is less than a certain value. That is, the noise signal 26 is normally pulse-shaped and has an extremely short duration. Therefore, the duration t2 of the 1" signal on the short-time side of the data signal 15 is set in advance to be sufficiently longer than the duration of the noise signal 26.
In the noise removal unit 29, as shown in FIG. 5Fdl, by forcibly cutting off the signal portion that does not last for more than t3 hours after the signal starts, noise components whose duration is shorter than time t3 are removed. , works similar to a low-pass filter. However, it is different from a normal low-pass filter.

In this noise removal method, even if the carrier frequency is increased by 1 to a level between that of the noise signal, the duration of the data signal 15 is only shortened without distorting the waveform.

Only the noise signal 26 in the space part is effectively removed,
Emphasize signal components. This signal is further processed by the waveform shaping section 30.
Components of the carrier signal 24 are removed at .

After the two types of long and short rectangular waves are converted into continuous signals as shown in FIG.
The sign of ``0''1'' is determined, and the sign shown in FIG. 5 (like fl.

This becomes a signal that can be input to the soft register 32.

At the same time this signal is input to the shift register 32,
The number of data hits is counted in the pulse count l part 33, and the number of bits is set in advance in the signal group 22.
When it detects that the number of bits becomes equal to the number of bits of the signal group 22 and that the series of signal group 22 has been received, a signal is sent to the shift pulse generator 34 and the data temporarily stored in the shift 1 register 32 is transferred to the electronic meter W-machine 2. Send it to.

It processes data.

FIG. 6 fat to ffl show signal waveforms in a modified embodiment of the data modulation method in the modulation section 23, and the two embodiments were shown above. Instead of simply intermittent I narrowing down signal 24 into two types, long and short.

As shown in FIG. 6 (bl), the duration and amplitude of both codes are the same, and only one frequency is changed by an equal frequency below the one-transmission frequency f, thereby distinguishing between the two. Also in this example.

After selectively receiving and extracting only the data signal 15 in the receiving section 27 (Fig. 6 (C1)), noise removal (Fig. 6 (dl)) and waveform shaping (Fig. 6 (e)
) and waveform check (FIG. 6(f)) to restore the data. However, in this embodiment, each time FM detection is performed using, for example, a frequency discrimination circuit in the waveform shaping section 30, only the frequency difference in the vertical direction from the carrier frequency f becomes a problem, and "0" and "0" in the data signal are generated. Since the 1" signal can be reproduced as a rectangular wave that changes from positive to negative, the influence of noise signals can be ignored. Therefore, it is not necessary to provide the noise removing section 29, and the duration of a signal for one bit can be shortened to 10 m5 ec to 100 μsec, and the amount of data that can be transmitted per second can be increased.

In the above embodiments, data is sent unilaterally from the terminal device 7 to the computer 2 for data processing, but the data is sent in both directions.

That is, after analyzing the data signal 15 sent from the terminal device 7 within the electronic computer 2, it is also possible to send a control signal from the electronic 81 computer 2 side to the terminal device 7. In this case, a receiving section 27 substantially similar to that provided on the computer 2 side is provided on the terminal device 7 side, and data sending means substantially similar to that provided on the terminal device 7 is provided on the computer 2+1'1.

Furthermore, instead of using the computer on the right to process the data output from all terminal devices, multiple terminal devices can be processed at once.
It is also possible to arrange for each block to have one electric computer. In this case, a plurality of data signals can be simultaneously transmitted on the AC power line by setting the jM transmission frequency to be different from -U for each block.

The present invention furthermore forms a data signal that displays the room number, item name, hour, etc. each time an item is taken out of a refrigerator provided in each 91% store such as a hotel, and is similar to the method described above. It is also possible to automatically calculate the charge δ1 by transmitting the signal onto the AC power line and taking out the signal from the AC power line and totaling it in a computer installed at the front desk of a hotel. Yet again. If the terminal device is in the form of a keyboard, data can be accessed anywhere by simply plugging the keyboard into an outlet, and the main computer can be shared by multiple people spread over several rooms without the need for dedicated wiring, or the keyboard can be carried around. It also becomes possible to immediately send the data to the computer side every time data is collected.

As described above, the present invention is configured to connect the terminal device 7 and the electronic calculator 2 via the AC power line 6, so that data reception can be easily performed without the need for constructing a dedicated line for data transfer. In addition to being able to transmit data, it is also possible to immediately respond to the addition of terminal devices 7 without any effort.

Furthermore, the priority order of data transmission to the terminal device 7 is determined.

Since the waiting time corresponding to the priority is set, A
When it is detected that the data signal 15 is flowing on the C power line 6, the other terminal devices 7 do not send data, and the A
Data from each terminal device 7 is sent out intermittently and orderly on the C power line 6.

On the receiving side, it has excellent effects such as being able to easily distinguish each data signal with a simple device.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the overall configuration of the present invention, Fig. 2 is a block diagram showing an outline of the terminal device, and Fig. 3 is a block diagram showing the outline of the computer side. Figure tJ An explanatory diagram showing the sending procedure of the data signal, Figure 5 (al~([) Le
t Waveform diagrams showing the processing procedure when transmitting and receiving data signals, FIGS. ...Electronic computer. 6... cffitA line to... 7... Terminal device. 9... Schiff I register. 10... Data converter. 13... Transmission start pulse. 15. ... Data signal. 16 ... Selection receiving section. 24 ... Carrier signal. 26 ... Noise signal. 27 ... Receiving section. Patent applicant: Systema Tsuku Co., Ltd. Representative Patent Attorney
Shigeru Chiba331 Figure 522 Figure 6

Claims (1)

[Claims] (1) A method for receiving and passing a data signal 15 between an electronic computer 2 and a terminal device 7, the data signal 15 being
It is characterized in that it is transmitted via a power line 6. A method of transmitting data for electronic computers. (Data signal 15 transmitted via 21 ACIC power supply line)
For example, a single transmission signal 24 of a constant frequency is intermittently sent as two types of data signals 15, long and short, with different durations corresponding to the codes of the data signals 15. On the receiving side, by setting a duration that is shorter than the data signal 15 on the short-time side and sufficiently longer than the noise signal 26, and forcibly canting signals with a duration shorter than this time,
The data transmission method according to claim 1, wherein noise is removed. () The data signal I5 transmitted via the AC power line 6 is a data signal 15 that is intermittently sent with a frequency that differs by 1j from the frequency of the carrier signal 24 in accordance with the code of the data. On the side, the data signal 15 is subjected to FM detection by a frequency discrimination circuit to extract positive and negative signals corresponding to the sign of the data. A data transmission method according to claim 1. (4) There are a plurality of terminal devices 7, and different standby times are set in advance for each terminal device according to the data transmission priority order, and while one terminal device 7 is transmitting the data signal 15, the remaining The terminal bag W7 does not send out the data signal 15,
4. The data transmission method according to claim 1, wherein the data is transmitted after the transmission of the data signal 15 is completed and a waiting time corresponding to the priority has elapsed. (5) The data signal 15 is sent from both the computer 2 and the terminal device 7. A data transmission method according to any one of claims 1 to 4. (6) A terminal device 7 that converts input data into a serial binary data signal, an AC power line 6 connected to the terminal device 7 and transmitting the data signal 15, and an AC power line 6 connected to the AC power line 6. Select and receive only data signal 15 (iL electronic calculation v9
．． and a receiving section 27 for restoring data to 2. Data transmission equipment for electronic computers. (7) The terminal device 7 includes a data converter 10 that converts input data into parallel binary numbers, a shift register 9 that stores the converted data, and a star)-pulse 13 in conjunction with the data input. A start pulse generating section 12 that outputs, a selection receiving section 16 that generates a stop signal 17 when receiving the data signal 15 flowing on the AC power line 6, and a selection receiving section 16 that allows input of the start pulse 13 and the stop pulse 17, When there is no human power, the start pulse 13 is sent as it is to the next stage, and if the stop signal 17 is input, the start pulse 13 is sent to the stop signal 17 after a preset waiting time after the end of the start pulse 13. a transmission check section 14 that sends the signal to the next stage, a shift register 18 that generates a shift register equal to the number of bits of the shift register 9 in response to the input of the start pulse 13 and drives the shift register 9; and a modulation section 23 that modulates the binary data. A transmission device according to claim 6. (8) The modulator 23 converts the carrier signal 24, which has one constant frequency and constant amplitude, into two types of intermittent signals, long and short, corresponding to the codes of the serial binary data. A transmission device according to claim 7. (9) The modulator 23 generates an intermittent signal of the same duration with different frequencies by changing the carrier signal 24 by an equal frequency up and down from the frequency of the carrier signal 24 in accordance with the code of the serial binary data. is being converted to . A transmission device according to claim 7.