JP2690287B2 - Data transmission limit system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission number limiting system, and more particularly, it relates to a plurality of communication devices for transmitting a plurality of transmission-permitted data, and the number of data to which transmission permission is simultaneously given in the entire system is designated in advance. The present invention relates to a system for limiting the number of data transmissions, which is limited to the maximum allowable number or less.

[0002]

2. Description of the Related Art A conventional data transmission number limiting system will be described with reference to FIGS. In FIG. 4, the data transmission request signal c transmitted from the control unit (CPU) 500 and the parallel-serial conversion unit 510 of the communication device 51 to the transmission permission device 60 is r1 to r1 as shown in FIG.
Transmission request data indicating the presence / absence of a transmission request corresponding to 100 transmission data generation sources up to 00 (“1” = requested,
“0” = no request) is configured in a time division manner, and r1 to
Up to r100 is one cycle, and the data are sequentially transmitted. In the transmission permission device 60, the number of requests of the data transmission request signal c (the number of “1”) is converted by the serial / parallel converter 631 and counted by the controller (CPU) 600. Similarly, the number of requests for the data transmission request signals d and e from the communication devices 52 and 53 is also converted by the serial / parallel conversion units 632 and 633, and then counted by the CPU 600, so that the communication device 51 connected to the transmission permission device 60, The total number of requests for all the data transmission request signals c, d, and e of 52 and 53 can be calculated. If the total number of all data transmission requests does not exceed the threshold (maximum allowable number) stored in the storage unit 610, r1 to r1 of the data transmission request signals c, d, and e.
Corresponding to the requested data of r100, s1 to s100
Data of the communication device 51, 5 through the parallel-serial conversion units 641, 642, 643.
2, 53 (see FIG. 5B). For example, when there is a request for r1 and r4 of the data transmission request signal c, s1 and s4 of the data transmission permission signal f are permitted and transmitted.
In the communication device 51, the CPU 500 receives the data transmission permission signal f through the serial / parallel conversion unit 520, and s1
And data corresponding to s4 are transmitted to the outside. Further, the sum of the requests of all the data transmission request signals is the storage unit 61.
When the threshold value stored in 0 is exceeded, the transmission permission device 60 prohibits (“0”) the data transmission permission signal for the portion exceeding the threshold value and transmits. Communication device 5
1, 52 and 53, the data transmission permission signal f,
Data is transmitted when g and h are permitted. For example, when all of r1 to r100 of the data transmission request signals c, d, and e are requested, that is, when the number of requests is 300 and the threshold value is 297, s1 of each of the data transmission permission signals f, g, and h is prohibited. s2 to s100 are transmitted with permission. The communication devices 51, 52 and 53 perform data transmission for the requests r2 to r100.

[0003]

The first problem in the above-mentioned conventional data transmission number limiting system is that the transmission permission device is necessary even when it is not necessary to limit the number of data transmissions. The reason is as follows.

If the number of communication devices that limit the number of data transmissions is small, even if all the data transmission request signals of each communication device are requested, the request number of all data transmission request signals is stored in the transmission permission device. May be smaller than the threshold value. At this time, since it is not necessary to limit the number of data transmissions, the function of the transmission permission device becomes unnecessary. However, since the communication device cannot transmit data unless the data transmission permission signal from the transmission permission device is permitted, the transmission permission device is required.

The second problem is that the same number of data transmission request signal lines and data transmission permission signal lines that connect the transmission permission device and the communication device are required. Therefore, when the number of communication devices increases, a large number of signal lines are connected, which complicates the production method and causes a problem.

Therefore, an object of the present invention is to provide a system for limiting the number of data transmissions, which simplifies the device configuration and improves productivity and reliability.

[0007]

SUMMARY OF THE INVENTION The present invention has a plurality of communication devices for transmitting a plurality of transmission-permitted data, and allows the maximum number of data to be transmitted at the same time in the entire system to be specified in advance. In a data transmission number limiting system for limiting the number of communication devices to a number less than or equal to a number, the communication devices are connected to each other by one common signal line, and the communication device has storage means for storing the maximum allowable number in advance, and its own communication device. A total of the total number of transmission requests, which is the number of pieces of data for which transmission permission is requested, in all communication devices of the system on the common signal line. Means for time division multiplexing to a data transmission request signal, means for reading the total transmission request number from the total data transmission request signal on the common signal line, and the read total transmission request number The maximum allowable number stored in advance is compared, and if the total number of transmission requests does not exceed the maximum allowable number, the transmission permission is given to all data for which transmission permission is requested, and the total number of transmission requests is If the maximum allowable number is exceeded, the transmission allowable number of the own communication device with respect to the maximum allowable number is calculated at the same ratio as the ratio of the own transmission request number to the total transmission request number, and the calculated transmission allowable number is calculated. And means for giving a transmission permission to only a few minutes of data that does not exceed the limit.

Further, in the above configuration, each of the communication devices repeatedly generates the data transmission request signal at a cycle in which the cycle of the all data transmission request signal is equally divided by the number of all the communication apparatuses, and the predesignated It is possible to adopt a configuration in which the data transmission request signal at a position where the number of repetitions is different for each communication device is selected, output to the common signal line, and time-division multiplexed as the all data transmission request signal.

According to the present invention, since a plurality of communication devices are only connected by one signal line, complicated wiring is not required and productivity and reliability are improved. Further, in each communication device, the number of data transmission requests of all the plurality of communication devices can be read and compared with a threshold value for data transmission to calculate the limit number of data transmission. The number of data transmissions of the entire communication device can be limited, and the device configuration can be simplified.

[0010]

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

Referring to FIG. 1, the data transmission number limiting system of the present invention includes a plurality (three) of communication devices 11, 12, and 13 for respectively transmitting a plurality (100 at maximum) of transmission data for which transmission is permitted, These communication devices 11, 12, 1
A common signal line 20 that connects the three in common and each communication device 1
The clock / power supply circuit 30 supplies necessary clocks and power supplies to 1, 12, and 13. Communication device 11
Is a control unit (CPU) 100 that controls the entire apparatus,
A storage unit 110 that is connected to the CPU 100 and stores various data such as a threshold value that is the maximum number (maximum allowable number) of transmission data of the entire system that is designated in advance and the program, and is transmitted under the control of the CPU 100. A transmission unit (TX) 120 that wirelessly transmits data transmitted from a data generation source, a parallel-serial conversion unit 130 that converts a parallel signal (for example, 1 byte) from the CPU 100 into a serial signal, and a parallel-serial conversion unit. A data transmission request signal a (see FIG. 2A) corresponding to a transmission data generation source from 130 is transmitted to the common signal line 20 at a designated transmission timing, and an all data transmission request signal b (see FIG. 2B). ), And a switch for designating the transmission timing of the request signal multiplexing unit 140. 150, counts the number of requests all the data transmission request signal in b on the common signal line 20 CPU 10
It has a counter unit 160 for notifying 0. Although not shown, the other communication devices 12 and 13 are also connected to the communication device 1.
The internal configuration is the same as that of 1.

Next, the operation will be described with reference to FIGS. The CPU 100 allows the parallel / serial conversion unit 130
The data transmission request signal a sent from the transmission request data a is transmission request data corresponding to 100 transmission data generation sources r1 to r100 (“1” = requested, “0” = no request) The communication devices 11, 12, 13
One cycle (time T) is data that is repeated three times corresponding to the total quantity. R1 to r1 in this one cycle
The repeated data of 00 is the same. Request signal multiplexer 1
40 selects one (first time) of the data repeated three times of the data transmission request signal a by the setting of the switch unit 150, and multiplexes it to the all data transmission request signal b. Similarly, also in the communication devices 12 and 13, by multiplexing the second and third data transmission request signals of the three repetitions with the total data request signal b, the total data request signal b
As shown in FIG. 2B, the data transmission request signals of the respective communication devices are sequentially multiplexed in one cycle.

On the other hand, the value obtained by counting the number of requests (the number of "1") in the total data transmission request signal b by the counter section 160 is read by the CPU 100 and compared with the threshold value stored in the storage section 110. When the requested number of all data transmission request signals b is less than or equal to the threshold value, the CPU 100 transmits all the requested data through the TX 120. When the number of requests for all data transmission request signals b exceeds the threshold value,
The data transmission prohibited number is calculated by the following formula, and the data transmission for the data transmission prohibited number is stopped. That is, the data transmission permission number is a value obtained by proportionally distributing the threshold value by the ratio of the number of data transmission requests of the own communication device to the total number of data transmission requests.

Here, A = the number of prohibited data transmissions of its own device (rounded down after the decimal point) B = the number of requested data transmission request signals of its own device C = the number of requested data transmission request signals of its own device D = threshold If the value is a value, the calculation formula is as follows: A = (C−D) × B / C + 1. Threshold D
Is "250", and the number B of requests for the data transmission request signals of the communication devices 11, 12, and 13 is "10", respectively.
In the case of 0 "," 90 ", and" 70 ", the number C of all data transmission request signals requested is" 260 ".

The data transmission prohibited number A of the communication device 11 is A = (260-250) × 100/260 + 1 = 4.84 by the above calculation formula.

The number A of data transmission inhibitions of the communication device 12 is: A = (260-250) × 90/260 + 1 = 4.46 ... When the fractional part is rounded down, A becomes "4".

The prohibited number A of data transmission of the communication device 13 is: A = (260-250) × 70/260 + 1 = 3.69 ... Around the decimal point, A becomes "3".

The permitted number of data transmissions in each of the communication devices 11, 12, and 13 is a value obtained by subtracting the number A of data transmission inhibitions from the number B of data transmission requests, and thus 100-4 = 9, respectively.
6,90-4 = 86,70-3 = 67, and the total of all communication devices is 96 + 86 + 67 = 249. In this case, the number of data transmissions (“249”) is equal to the threshold value (“25”).
Although it is smaller than 0 "), it is 1/250, which is a value that can be sufficiently ignored.

When limiting the number of data transmissions, as a method of determining which transmission data generation source data is to be permitted / prohibited for transmission, a method of permitting according to a preset priority order or a prohibition There are methods such as sequentially allocating.

Data transmission in this system is performed wirelessly. Each of the communication devices 11 to 13 wirelessly transmits all the transmission data corresponding to the transmission data source for which the transmission permission is given by the TX 120. Therefore, as the number of data transmissions increases, the current consumption of the communication devices 11 to 13 also increases significantly. Since the power supply of each of the communication devices 11 to 13 is supplied from the clock / power supply circuit 30, the communication device 1
When 1 to 13 simultaneously send a large amount of data at the same time, the load on the clock / power supply circuit 30 becomes large. However, as described above, in this example, the communication devices 11, 1
Since the total number of data transmissions 2 and 13 can be limited, the current consumption can be limited and the load on the power supply circuit can be kept below a certain level.

Next, FIG. 3 shows a modification of the data transmission request signal of each of the communication devices 11 to 13 and the method of multiplexing the signal to all the data transmission request signals. FIG. 3A shows the communication device 1.
The parallel / serial conversion unit 130 by the CPU 100 of 1
3 shows a data transmission request signal a2 output from The transmission request data of r1 to r100 is output only once within one cycle (time T). The request signal multiplexer 140 sends to the common signal line 20 only the leading portion of each of the data r1 to r100 divided into three, according to the timing selection designation from the switch unit 150. Similarly, each of the communication devices 12 and 13 sends out the intermediate part and the end part of r1 to r100 divided into three parts of the respective data transmission request signals to the common signal line 20 to transmit all data as shown in FIG. 3 (B). The request signal b2 is multiplexed and generated. The counter unit 160 also receives the above-mentioned all-data transmission request signal b2 (FIG. 2B).
Similarly to the all data transmission request signal b, the total number of transmission requests can be counted.

[0022]

As described above, according to the present invention, the number of data transmission requests of all the plurality of communication devices is read by each communication device, and the data transmission threshold value (maximum allowable number).
By comparing and calculating with the above, it is possible to calculate the limited number of data transmissions (permitted number), and it is possible to limit the total number of data transmissions of a plurality of communication devices.

Further, since a plurality of communication devices are simply connected by one common signal line, complicated wiring is not required and the productivity and reliability of the system are improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

2 is a diagram showing a first example of a signal format of the system of FIG. 1, where FIG. 2A is a data transmission request signal of one device, and FIG. 2B is a data transmission request of all devices. Indicates a signal.

3A and 3B are diagrams showing a second example of the signal format of the system of FIG. 1, where FIG. 3A is a data transmission request signal of one device, and FIG. 3B is a data transmission request of all devices. Indicates a signal.

FIG. 4 is a block diagram showing a conventional data transmission number limiting system.

5 is a diagram showing a signal format of the system of FIG. 4, and FIG. 5 (A) is a data transmission request signal of one device,
Diagram (B) shows the data transmission permission signal of one device.

[Explanation of symbols]

 11, 12, 13 Common device 20 Common signal line 30 Clock / power supply circuit 100 CPU (control unit) 110 Storage unit 120 TX (Transmission unit) 130 Parallel-Serial conversion unit 140 Request signal multiplex unit 150 Switch unit 160 Counter unit

Claims (2)

(57) [Claims] 1. A number of data transmissions having a plurality of communication devices for transmitting a plurality of data for which transmission permission has been granted, and limiting the number of data simultaneously transmitting permission in the entire system to a predetermined maximum allowable number or less. In the restriction system, the communication devices are connected to each other through a single common signal line, and the communication device requests the transmission permission within the storage device and the storage unit that stores the maximum allowable number in advance. A data transmission request signal indicating the number of self-transmission requests, which is a number, is time-division-multiplexed to an all-data transmission request signal indicating the total number of transmission requests, which is the number of data for which transmission permission is requested in all communication devices of the system on the common signal line. Means for reading the total number of transmission requests from the all-data transmission request signal on the common signal line, and the total number of transmission requests read and stored in advance If the total number of transmission requests does not exceed the maximum permissible number, a transmission permission is given to all the data for which transmission is requested, and the total number of transmission requests is the maximum permissible number. If the number exceeds the above, the transmission permission number of the own communication device for the maximum allowable number is calculated at the same ratio as the ratio of the own transmission request number to the total transmission request number, and the calculated transmission permission number is not exceeded. A system for limiting the number of data transmission, comprising means for giving a transmission permission to only minute data. 2. Each of the communication devices repeatedly generates the data transmission request signal at a cycle in which the cycle of the all data transmission request signal is equally divided by the number of all communication devices, and each of the communication devices designated in advance. 2. The data transmission number limiting system according to claim 1, wherein said data transmission request signals at different repeat count positions are selected and output to said common signal line and time division multiplexed as said all data transmission request signals.