JPS6374293A - Remote control system - Google Patents

Abstract

PURPOSE:To reduce a state supervisory time by sending a common state supervisory signal to each group comprising all master equipments or prescribed number of terminal equipments and allowing the terminal equipment side to send a reply signal sequentially in the time division system according to the predetermined order. CONSTITUTION:A state supervisory signal is sent from a master equipment sending means as a radio wave, it is received by a terminal receiving means 6 and when it is discriminated to be effective by a terminal discrimination means 7, the means 7 starts a timer 10. The timer 10 outputs a pulse every time a prescribed time T1+T2 elapses, where T1 is a data transmission time from a master equipment 1 to a terminal equipment 2 or vice versa and T2 is an arithmetic time. When the pulse number from the timer 10 is coincident with the number set by a delay time setting means 11, a reply signal is sent from a terminal sending means 9. Thus, the state supervisory time is reduced and the time required to detect the state change in the terminal equipment is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field This invention sends a status monitoring signal (when status monitoring) and a command signal (when controlling equipment) from a base unit to multiple terminals, and The present invention relates to a remote control system that can send a response signal from a terminal to a base unit, and relates to a remote control system that can shorten the status monitoring time, which is the time required to monitor the status of all terminals during status monitoring.

(B) Conventional Technology In recent years, there have been remote control systems that can control electrical equipment in a home or check security information by wire or wirelessly. In these remote control systems, the status of the terminal may change regardless of commands from the base unit, such as when the status of a device changes or when a sensor is activated. It is necessary to monitor the status of

Conventionally, remote control systems have mainly adopted the following two signal transmission methods. The first method uses channels of different frequencies for each terminal. Although this method can quickly respond to changes in the status of the terminal, it requires a wide frequency band. The second method uses only one channel, and uses a time-sharing method to sequentially send status monitoring signals from the base unit to multiple terminals, and sends response signals from the terminal side to the base unit (hereinafter referred to as polling). (referred to as the polIinO method). In this polling method, each terminal is assigned an address and its status is monitored from the base unit. The address part of the I'2 signal is changed to the address of each terminal, and the signals are sent out sequentially. The terminal side compares the address part of the status monitoring signal from the base unit with its own address, responds only when they match, and sends a response signal to the base unit.

For example, the "Total Control System for Domestic Appliances" disclosed in Japanese Unexamined Patent Publication No. 55-44291 and the "Remote Monitoring Control System" disclosed in Japanese Unexamined Patent Publication No. 55-102990 are based on this polling method.

Figure 4 is a time chart showing the above polling method when there are three terminals, and T1 is from the base unit to the terminal,
The data transmission time from the terminal device to the master device, T2, is the screening time. In this method, the base unit 20 i, t? J terminal machine 21a
Since a status monitoring signal is sent to each of the terminals 21a to 21c, the time Ta required to monitor the status of all the terminals 21a to 21G is 7a ``'' (TI + T2 ) X 2Xllll - where the number of terminals is m.
−<1 1>.

(c) Problems to be Solved by the Invention However, although the above-mentioned polling method can effectively utilize frequencies, it has the disadvantage that it is slow to respond to changes in the status of the terminal. In other words, there is a time when the actual status of the terminal and the status of the terminal stored in the base unit differ, and the longer the number of terminals and the slower the transmission speed, the longer the time for the discrepancy occurs, and the more likely it is to operate incorrectly. was also connected. Therefore, there is a need for a signal transmission system that can shorten the time required to monitor the state of the vehicle.

This measure was made in view of the above circumstances, and the base unit sends a common status monitoring signal to all terminals or to each group of a predetermined number of terminals.
The present invention aims to provide a remote control system that can shorten the status monitoring time by sequentially transmitting response signals on the terminal side in a predetermined order using the -C time division method.

(d) Means for Solving the Problems The configuration of the present invention is composed of a base unit and a plurality of terminals installed at separate locations, and the load connected to each terminal is connected to the base unit and a plurality of terminals. Controlled by signals from
A remote control system in which a base unit can monitor the operating status of each terminal, the base unit outputting a status monitoring signal for causing the terminal to output a response signal indicating the operating status of the terminal. , receiving means for receiving the response signal output from each terminal, and determining means for determining the state of the terminal from the received response signal, and
Each terminal device includes a receiving means for receiving the status monitoring signal output from the base unit, a determining means for determining whether the received status monitoring signal is valid, and a determining unit for determining whether the received status monitoring signal is valid. a transmitting means for outputting a response signal indicating the operating state after a predetermined period of time has elapsed after receiving the state monitoring signal; and the transmitting means is operated so that the transmitting means outputs the response signal after the predetermined time, which varies for each terminal. This is a remote control system characterized by comprising a transmission control means.

(e) Effect When a status monitoring signal is commonly sent from the transmitting means of the base unit to all terminals or to each group of terminals in a predetermined number, each terminal side performs transmission control. After a predetermined period of time, which varies depending on the terminal, the means operates the transmitting means of the terminal to send out a response signal. Therefore, response signals are transmitted from each terminal in a time-sharing manner according to a predetermined order.

(f) Examples Examples of the present invention will be described in detail below with reference to the drawings, but the invention is not limited to the following examples.

In FIG. 1, a base device 1 includes a base device transmitting means 3 that outputs a status monitoring signal for causing the terminal device 2 to output a response signal indicating the operating state of the terminal device 2, and a base device transmitting means 3 that outputs a status monitoring signal for causing the terminal device 2 to output a response signal indicating the operating state of the terminal device 2. It is equipped with base unit transmitting means 4 for receiving signals, and base unit determining means 5 for determining the status of terminal 2 from the received response signal.

The terminal device 2 also includes a terminal receiving device 6 that receives the status monitoring signal output from the parent device transmitting device 3;
terminal determining means 7 for determining whether the status monitoring signal received by the terminal determining means 7 is valid; terminal transmitting means 9 for outputting a response signal indicating the operating state of the load 8 connected to the terminal determining means 7;
A pulse generation circuit (hereinafter referred to as a timer) 10 that outputs a pulse signal at a constant cycle, and response signal transmission delay time setting means (hereinafter referred to as delay time setting means) that sets the timing at which the terminal transmission means 9 outputs a response signal. ) 11. In addition to the function of determining the status monitoring signal, the terminal determining means 7 counts the number of output pulses from the timer 10 and compares it with the number set by the delay time setting means 11. If the number matches, the terminal transmitting means It has a function of outputting a control signal to operate 9. In other words, the transmission control means 12 is composed of a part of the function of the terminal determination means 7, the timer 10, and the delay time setting means 11.

Next, the operation of this embodiment will be explained with reference to FIGS. 2 and 3.

When the status monitoring signal is transmitted by radio waves from the main device transmitting means 3, received by the terminal receiving means 6, and determined to be valid by the terminal determining means 7, the terminal determining means 7 starts the timer 10. The timer 10 has a fixed time T in FIG.
A pulse is output every time +T2 (=TO) elapses. Here, T1 is the data transmission time from base device 1 to terminal device 2 or from terminal device 2 to base device 1, and T2 is the performance C? 1
It's time. Then, when the number of pulses from the timer 10 matches the number set by the delay time setting means 11, a response signal is transmitted from the terminal transmitting means 9. Generally, the number of pulses set by the delay time setting means 11 is set to have a different value for each of the terminals 28 to 20 as follows. In other words, by setting the terminal 2a to 01, the terminal 2b to 1, the terminal t12c to 2, ..., the terminal 2n to (n-1), the response signal transmission delay time is 0 for the terminal In2a.
1 terminal 2b is To, terminal 2C is 2To, etc.
・Terminal 2n becomes (n 1)To, and terminal t12a
The response signals from ~20 are transmitted without collision.

The sent response signals are sequentially received by the vA machine receiving means 4.

When the last terminal 2n response signal is received, base unit 1 sends out the status monitoring signal again.

Here, the operation will be explained with reference to FIG. 2 in the case where there are three terminals.

First, the response signal transmission delay time at terminal R2b is Td,
, , If the response signal transmission delay time at the terminal 2C is Td3, then Td 2 = T1 + T2 (2
-1) Td3 = (Tl +T2)X2...
...(2-2). In this embodiment, once the status monitoring signal is sent from the base unit 1 to the terminals 28 to 2C, the terminals 2a to 2C sequentially send response signals in a predetermined order. That is, at 43 in FIG. 2, terminal 2a first sends a response signal, and terminal 2b sends a response signal.
The terminal 2c transmits a response signal after Td2 has elapsed from the response signal transmission start time of terminal F32a, and the terminal 2c transmits a response signal after Td3 has elapsed from the response signal transmission start time of terminal F32a. According to the signal transmission method in this embodiment, all the terminals 28 to 2c
The time Tb required to monitor the status of
Then, Tb = (Tt +72) X (m + 1>
・・・・・・(2-3) Here, by subtracting the formula (:'-3) from the formula (1-1), we get Tab=Ta Tb ” (TI + T2 ) X
(m 1)...(2-4) This represents the difference in status monitoring time compared to the conventional example, and generally speaking, the more terminals there are, the faster the transmission speed is. The slower the time, the greater the difference. In wireless home remote control systems, the transmission speed is usually 200 to 6
00bps (bits par 5econd) is used - for example a transmission rate of 300bps.

When Ta and Tb are calculated from equations (2-2) and <2-3, respectively, when transmitting a signal with 100 bits, when there are 10 terminals, Ta is approximately 6.1 seconds and Tb is approximately 3 seconds. .7 seconds, and if there are 50 terminals, Ta will be about 33 seconds and Tb will be about 17 seconds, which is about half the time compared to the conventional one. In this signal transmission method, once the status monitoring signal is sent from the base unit 1, the base unit 1 cannot control the terminals 2a to 2C until the transmission from all terminals 28 to 2C is completed, so the number of terminals increases. If there are many terminals, it is sufficient to divide the terminals into several groups and apply the above signal transmission method to each group. FIG. 3 shows a time chart of the signal transmission system when the signals are divided into groups G and G3. In the figure, the number of terminals is 12, and one group has four terminals.

(1-) Effects of the Invention According to the present invention, a remote control system can be obtained that can shorten the status monitoring time and shorten the time required to detect a change in the status of a terminal. Therefore, it is possible to smoothly control the terminal and prevent erroneous operations.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is a time chart showing the relationship between status monitoring signals and response signals, and FIG. 3 is a diagram of how terminals are divided into groups. FIG. 2 is a diagram corresponding to FIG. 2 in the case of control using J, and FIG. 4 is a diagram corresponding to FIG. 2 in a conventional example. 1... Master unit, 2.
...terminal device, 3...base device transmission means, 4
. . . Master device receiving means, 5 . . . Master device discrimination means, 6 . . . . Load, 9 . . . Terminal transmission means, 12 . . . Transmission control means.

Claims (1)

[Claims] 1. Consisting of a base unit and multiple terminals that are installed at separate locations, the load connected to each terminal is controlled by signals from the base unit, and the base unit controls each terminal. A remote control system capable of monitoring the operating status of a terminal, the base unit comprising a transmission means for outputting a status monitoring signal for causing the terminal to output a response signal indicating the operating status of the terminal, and a transmission means from each terminal. The terminal includes a receiving means for receiving the output response signal, and a determining means for determining the status of the terminal from the received response signal, and each terminal receives the status monitoring signal output from the base unit. a receiving means for receiving, a determining means for determining whether the received condition monitoring signal is valid, and a response signal indicating the operating state when the condition monitoring signal is determined to be valid; 1. A remote control system comprising: a transmitting means for outputting a response signal later; and a transmitting control means for operating the transmitting means so that the transmitting means outputs a response signal after the predetermined time, which is different for each terminal.