JPS59143446A - Power saving contention system - Google Patents

Abstract

PURPOSE:To save electric power consumption in a slave device by allowing immediately the slave unit to communicate with a master device when an emergency data transmission request is generated in the slave unit, and establishing data communication with only a necessary slave device for the minimum processing time at the generation of data collision. CONSTITUTION:The slave device side is provided with a timer controller 2-2 controlling the generation of a contention call at a time specified from the master device, a powr supply controlling part 2-5 stopping unnecessary power supply parts at the time other than a transmission/reception range, and a transmission/reception controlling part 2-1 controlling the transmission/reception of data. The control part 2-5 is started by an output signal from the controller 2-2 and a data request signal generated from a sensor 2-3 to enable the slave device to be communicated and to allow the master device to generate the contention call. The master device is provided with a data collision detecting part 5 detecting the collision of receiving data and a time data setting part 7 determining the succeeding contention call generating time from the slave device at the communication with the slave device and transmitting the determined time to the salve device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a communication system for a data collection system consisting of a miscellaneous device and a plurality of child devices each having an individual address.
In particular, it relates to improvements to the contention-based 474 system.

Conventional configuration and its problems Conventionally, the polling method and the contention method are well known as the above-mentioned communication methods.

In the polling method, as shown in Fig. 1, the sharp device (1) controls the slave devices so that multiple slave devices (21), (22)
...This is a method of collecting data in order starting from (2o).

In this case, the child devices (21), (22), ... (2n) are always on standby in the receiving state, and the transmitting/receiving controller 00 constantly monitors the polling signal from the device (1), and when the child device is selected by the polling signal. When the sensor data is sent and received from the sensor Oυ to the sharp instrument (1) via the controller OI.
is configured to send to. However, as described above, since the transmitting/receiving controller α1 must always be in a monitoring state, this method is not suitable in terms of power consumption when driving the child device with the battery (2).

On the other hand, the contention method uses child devices (2□) (2□),
...(2n) independently interrupts the sharp device (1), so lower power consumption can be achieved compared to the polling method. However, child devices (21) (22)...
・As the number of (2n) increases, the number of data transmissions of the entire slave device in interrupt mode increases, so the slave device (21) (
2+ )...(2n) increases the collision probability of data transmitted. In addition, in this method, the child device (2, 1) (2z
)...(2°) Unless a contention occurs, the sharp device (1) cannot know the status of the child device (21X22)...(2n).

Therefore, in order to eliminate the drawbacks of the above contention method, the following time contention method has already been proposed.

In response to a contention call from a slave device, a time contention type device sends a response signal back to the slave device.
Next, the timing at which a contention call is generated is sent to the child device as time data, and the device manages the generation time of the contention call from the child device, allowing simultaneous alarms to be issued from two or more child devices. In addition, since the time of the next contention call is clear on the slave side, it is possible to control the transmitter/receiver power supply to be stopped until then, thereby reducing the power consumption of the slave unit's power supply. This is the main purpose of the time contention method.

In FIG. 2, (1)' is a sharp instrument used to collect data from a group of child instruments. (2□) (2□) is the slave device, (2'-8) is the sensor, (2'-4) is the battery, and (2'-1) is the transmitting/receiving controller. , First, on the condition of iHH, the child device address and sensor (2'-8)
The data from This transmission data structure JFc is the same as that in FIG. 9 (v), and hereinafter this signal will be referred to as a contention signal. (2'-2) is a time controller, and sharp instrument (1)'
The time data (data specifying the timing at which the child device will issue the next contention call) included in the data sent from , and counts up to the time specified by time data. In addition, the time controller (2'-2) transmits its own status through the t4 line (C).
Output to. The state is at the "'L" level during the period from when the time data is stored to the end of counting, and at the "'H" level otherwise. The operation timing is the same as that shown in FIG. 8 (Q). This signal line (C) controls the transistor Tr,
) power control is performed. In other words, when the reception of the response signal from the sharp instrument (1)' is completed and the time data is set in the time controller (2'-2), the transmitting/receiving controller (2'-1) is powered off by the transistor Tr and starts operating. Stop. On the other hand, the time controller (2'-
2) " starts counting the set time data, and when the specified time elapses, turns on the transistor Tr again. As a result, the transmission/reception controller (2'-1)
transmits the sensor data to the sharpener (1)' as described above. As described above, the slave device group makes a contention call from the sharp device (1)' at a specified time, and sequentially transmits sensor data to the sharp device (1)'. Figure 8 shows this situation, where (a) is the sharp device transmission section, and (b) is the child device (
21) Transmission section, (C) is slave unit (21) operation section, (d
) is the transmission period of the child device (22), and (e) is the operation period of the child device (22).

In this way, in the time contention method, it is possible to reduce the power consumption of slave devices without causing data collisions. However, when an urgent data transmission request occurs, a considerable amount of waiting time occurs. Fourth
The figure shows the following situation: (a) is a sharp device, (b) is a child device (21), (C) is a child device (22), and (d) is a child device (2).
1) is the waiting time. For example, the timing T immediately after the child device (21) finishes communicating with the sharp device in FIG.
When emergency data occurs at time p, a waiting time To occurs until the next contention call timing T21. In the case of time contention method, in order to avoid data collision, between each contention (T11-T12e
T12 T1! ...), the contention call cycle (T1 * T2) becomes longer in proportion to the number of child devices n, and depending on the contents of the system configuration, the emergency data generated at timing b may The data may not persist, or even if it persists, it may be useless data when received by the sharp instrument (1)'.

Purpose of the Invention The present invention uses a time contention method to enable communication with a sharp device immediately when an emergency data transmission request occurs on the child device side, and to achieve the necessary communication with the minimum processing time even when a data collision occurs. The purpose of the present invention is to provide a power-save contention method that can establish data communication only with a child device and reduce power consumption (power save) of the child device.

Structure of the Invention The power save contention method of the present invention controls generation of a contention call at a time specified by the slave device in a data collection system consisting of a sharp device and a plurality of slave devices having individual addresses. A timer controller that performs this, a power supply control that suspends the power supply of unnecessary parts except for the transmission and reception period, and a transmission and reception controller that controls the transmission and reception of data. activating the power supply control unit by a data transmission request signal sent to
The device is configured to enable communication and generate a contention call to the device, and the device is configured to include a data collision detection unit that detects a collision of received data, and a data collision detection unit that detects a collision of received data, and a data collision detection unit that detects a collision of received data, and a data collision detection unit that detects a collision of received data, and a contention call from the child device when communicating with the child device. It is characterized by comprising a time data setting section that determines the next contention call generation time and transmits it as time data to the slave device.

DESCRIPTION OF EMBODIMENTS When a data collision occurs during communication using the method of the present invention, that is, a contention call generated periodically by the slave timer controller and a contention call generated by a data transmission request from a sensor etc. If they occur at the same time, the device immediately sends a response signal specifying the address of the slave device where the occurrences occur at regular intervals, and releases the communication state with the corresponding slave device. In other words, on the child device side, it is assumed that transmission and reception have ended and unnecessary power supplies are turned off.

The situation is shown in FIG. (a) is the sharps transmission section, (b)
) The transmission interval of the slave unit (21), (C) is the operation interval of the slave unit (21), (d) and (e) are the transmission interval and operation interval of the other slave unit (2x). The child device (21) corresponds to the child device that has issued the periodic contention. Furthermore, the sharp device then sends a data request command (
In FIG. 6, the PC data section) is transmitted. However, at the time of sending the data request command, all slave devices are in a communication disabled state except for the other slave device (2x) that generated a contention call at the time of data collision.
Naturally, only the child device (2x) responds and sends data to the device. At this point, the address of the slave device (2x) is also clear for the slave device (2x), and by sending an end command from the sharp device to the slave device (2X) along with the address of the slave device (2x) that has been determined, the slave device ( 2x) is processed within a short time.

In the above general explanation, the case where a data collision occurred was explained with reference to FIG.
is the sharp device transmission section, and (b) (C) is the transmission section and operation section of the child device (21). In other words, if no data collision occurs, the slave device address that issued the contention call can be known on the sharp device side, so the data request command (p
Transmission of c) is not performed, and the termination command is immediately transmitted. The structure of the above-mentioned transmitted and received data is the contention call shown in FIG.

(g) A sharp instrument response signal (equivalent to an end command) and (b) a goodwill data request command.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 7 is a block diagram of a thousand birds suitable for the power-saving contention method of the present invention, and shows a configuration diagram for transmitting sensor data to the friendly.

(2-1) is a transmitting/receiving controller that not only transmits the child device address and sensor data to Goodwill, but also analyzes the data received from Goodwill and processes the received data only when the child device address matches the received data. . Note that the transmitted and received data is structured as shown in FIG. (2-2)
is the time controller, (2-8) is the sensor, (2-
4) is the battery + Trl is the transmitting/receiving controller (2-1)
This is a transistor for controlling the power supply of the transistor, and the above description is almost the same as that explained in the conventional example shown in FIG. What differs from the configuration in FIG. 2 is the power supply control section (2-5).

Next, the detailed operation of the senba will be explained with reference to FIG. Figure 8 (A) to (E) are each part (support) of Figure 77.
This is the 4th timing for transmission and reception of ~(e).

First, start counting with the time controller (2-2),
When the count reaches the specified value, a power start signal, which is an output signal from the timer controller (2-2'), is output to the signal line (c), and this signal causes the power control unit (
2-5) sets the signal line (b) to "H" level. As a result, the transistor Tr1 is turned on, power is supplied to the transmitting/receiving controller (2-1), and a contention call signal in the format shown in FIG. 9 is transmitted to the goodwill. And a response signal from goodwill [Figure 9 (
When the contention call is received normally, the time data indicating the time when the next contention call will be generated is set in the time controller (2-2), and then the power supply control unit (2-5
) and outputs a power OFF signal (see Figure 8) to stop the transmitting/receiving function. And then the time controller (
From 2-2), the stopped state is maintained until the power start signal is outputted to the signal line f again. However, the sensor (2-8
When a data transmission request signal is output from ) to the signal line ), the power supply control unit (2'-5) sets the signal line (b) to the "H" level and generates a contention call in the same manner as described above. . The timing chart in Figure 8 shows the case where no data collision occurs, but for example, if a data collision occurs at this time, the data from Goodwill will first be sent to a device with a different slave address, that is, another device with a different address. Although it returns a response signal for Senba, it does not operate because the slave device addresses do not match (not shown). Subsequently, the received data request command causes the transmission/reception controller (2-1) to:
It performs the same operation as the data transmission request from the sensor (2-8) and transmits the contention signal again. Then, with the response signal sent again from Goodwill (in this case, the addresses match), the power supply control unit (2-5) is set to 0FF.
Press L to enter the stop state. When data is sent and received in a sequence other than the contention call that occurs periodically as described above, or in response to a data transmission request from the multi-sensor (2-8), the data in the time controller (2-2) is not controlled. Not (changed).

Figure 10 is a professional diagram of goodwill suitable for the method of the present invention.
(3) is a receiving section, and (4) is a received data analysis section, which receives contention signals from a thousand birds, analyzes child device addresses, sensor data, etc., and makes decisions. (5
) is a collision detection unit that detects whether or not the received data has collided based on the result of the received data.

It is. (6) is a clock, and (7) is a time data setting section, in which time data to be sent to Senba is set.

(8) is a transmission command setting section, which sets a response signal or a data request command according to the received data. (9) is a transmitter that sends data.

Next, let's talk about the function of the time data setting section (7).
This will be explained with reference to Figure 1. In addition, Figure 11 (a) is goodwill, (b) (c) (d) is Senba (2,) (22)...
- Indicates (2n). FIG. 11 shows T1. T2 indicates the period of contention reception from 1,000 birds, Tl means the first consecutive day, and T2 means the second consecutive day. Also, T11
t Tl□...T21*T22-... is the timing at which each thousand birds is expected to generate a contention signal for goodwill. In other words, this is the timing when Goodwill sets the time for the contention signal to be generated for the 1,000 birds, sets the time data so that it will occur at that time, and sends it to each of the 1,000 birds. Here, the contention signal generation timings of Senba (21) are T1□ and T21, and Senba (22) means T12mT22.

The time data setting section (7) sets the contention signal generation time in each prediction of the T2 period before accepting or accepting the contention signal of the T1 period.

There are several ways to do this, but for example, let's take the method of setting the interval between time slots (T4) as an example. Assuming that the time slot (T4) is 5 seconds and the number of child devices n = 8, then 5 (seconds) At X8=40 seconds, T1. The T2 period is 40 seconds. From now on, Senba (21) timing Tll and T
Since the time interval of 21 is 40 seconds, if Tll is 0 seconds, T2□ is 40 seconds. Senba (22) is 1,000 (21)
), since 1 slot time = 5 seconds delay, T1
2=5 seconds, T2□=6 seconds. In this way, the contention occurrence time (timing) for each thousand birds in the T2 period is set before the T1 period. When contention occurs from Senba in the T1 cycle, the time is compared with the set time, and if there is a difference, the time data to be sent to Senba is corrected, and sent as a response signal to Senba from m (9). Send a signal containing time data. In this way, the time data setting section (7) has a function of adjusting the Senba contention call time while always making correspondence between the received Senba address and time data.

Next, a description will be given of an operation when a data collision occurs during arc reception.

During data reception, if a data collision is detected by the collision detection section (5), after the reception is completed, the time data setting section (7) and the transmission command setting section (8) are sent via the received data analysis section (4).
The collision results are output. By doing so, the time data setting section (7) clarifies the Senba address that generates the periodic contention call as described above, and the time data setting section 7 clarifies the first child device of the collision. First, a response including this Senba address is transmitted from the bow transmitter (9). Then, a data request command is sent to the entire Senba from the transmission command setting section (8). Note that this transmission procedure is as shown in FIG. 6, which has already been explained. As a result, a contention call is generated from Senba again. When the mounting board receives the 1000 bird address and sensor data, the mounting board returns to normal control operation and performs processing.

and sends a response signal to the thousand birds.

As described in the detailed description of the invention, according to the power save contention method of the present invention, a communication state can be established with a minimum number of communication procedures, and accurate data collection can be performed. In other words, even in the event of an emergency situation, the Senba side is equipped with a power supply control unit that controls the transmitter/receiver controller to be ready for communication with an emergency data transmission request, so there is no need for a long waiting time as in the past. It also becomes possible to save power and perform transmission and reception. Furthermore, even if a data collision occurs, it is possible to make communication impossible with the response signal from the mounting plate, which is the cause of the collision, so that the target can be quickly reached without data interference. This data is received by the mounting plate.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the conventional 5m transmission system, Figure 2 is a configuration diagram of the time contention system, and Figures 8 and ff14 are the
Fig. 5 is an explanatory diagram of the basic communication control procedure of the present invention, Fig. 6 is an explanatory diagram of the communication control procedure when a data collision occurs in the method of the present invention, and Fig. 7 is a diagram of the method of the present invention. The tPs diagram is an operational explanatory diagram of FIG. 7, FIG. 9 is a format diagram of an embodiment of data transmitted and received by the method of the present invention, and FIG. FIG. 11 is a configuration diagram of the mounting plate of the embodiment, and is an explanatory diagram of the operation of FIG. 10. (2-1)...Transmission/reception controller, (2-2)...
・Time controller, (2-1)...Sensor, (
2-5)...Power control unit, (3)...Receiving unit, (4
)... Received data analysis section, (5)... Collision detection section,
(6)...Clock, (7)...Time data setting section,
(8)...Transmission command setting unit, (9)...Transmission department agent Yoshihiro MorimotoFigure 1Figure 2Figure 3Figure 4Figure 6Figure 7Figure β Figure 9 (Kikuguchi Go Core = Ko

Claims (1)

[Scope of Claims] 1. A timer controller that controls generation of a contention call at a time specified by a miscellaneous device in a data collection system consisting of a miscellaneous device and a plurality of slave devices having individual addresses; It is equipped with an fffb12 control unit that shuts off the power to unnecessary parts except for the transmission and reception section, and a transmission and reception controller that controls the transmission and reception of data. The signal activates the power supply control unit and puts the slave device in a state where j[11 signals can be received;
The miscellaneous device is configured to generate a contention call to the miscellaneous device, and the miscellaneous device is equipped with a data collision detection unit that detects a collision of received data, and a data collision detection unit that detects the generation time of the legal device contention call from the slave device when communicating with the slave device. A power-saving contention method consisting of a time data setting section that determines and sends time data to slave devices. 2. When a data collision occurs, the miscellaneous device transmits a communication response signal to the slave device whose contention call generation time set by the data collision occurrence time and the time data is closest, and communicates with this slave device. The system is configured to establish data communication only with the other slave device that generated the contention call when the data collision occurred by terminating the data collision and subsequently transmitting a data request signal to the other slave device. A power-saving contention system as claimed in claim 1 characterized by: