JP3180449B2 - Transceiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting / receiving device for transmitting / receiving data between a telephone line and a gas meter or various security devices.

[0002]

2. Description of the Related Art When a battery is used as a power supply for a transmission / reception device, it is necessary to extend the life of the battery as much as possible. Therefore, an intermittent operation method is used in which a communication state is established with a transmission / reception device of a communication partner at predetermined time intervals. A conventional transmission / reception apparatus using the intermittent operation method will be described with reference to FIG. FIG. 4A shows a synchronization signal transmission device constituting a master device for transmitting a synchronization signal for intermittent operation, wherein 1 is an antenna, 2 is transmission means, 3 is synchronization signal generation means, 4 is timer means, Is a power switch, and 6 is a battery. FIG.
5A is a timing chart of each output terminal of the synchronization signal transmitting device of FIG. The operation of the conventional synchronization signal transmission device of the parent device will be described with reference to FIG.
The timer means 4 outputs a pulse to the output terminal a at a certain time interval T as shown in FIG. 5A, and at the same time closes the switch 5 to supply power to the transmission means 2. The synchronizing signal generating means 3 is started by the pulse of the output terminal a, and transmits a synchronizing signal for adjusting the timer of the communication partner to the communication partner from the antenna 1 via the transmitting means 2 at the timing shown in FIG. And send it. The transmission time of the synchronization signal is T1 seconds.

FIG. 4 (B) shows a synchronization signal receiving device constituting a slave device for receiving a synchronization signal for an intermittent operation.
Is an antenna, 8 is a receiving means, 9 is a synchronization signal detecting means, 1
0 is a timer means, 11 is a power switch, and 12 is a battery. FIG. 5B is a timing chart of each output terminal of the synchronization signal receiving device of FIG. 4B. The operation of the conventional synchronization signal receiving device of the slave device will be described with reference to FIG. The timer means 10 outputs a pulse to the output terminal c as shown in FIG.
The switch 11 is closed by the signal shown in FIG. The synchronizing signal detecting means 9 is started by the pulse of the output terminal c and detects a synchronizing signal of the communication partner from the communication partner. The switch 11 is kept closed because the output continues to be generated from the output terminal d of the timer means 10 until the synchronization signal is detected. When the synchronizing signal is detected by the synchronizing signal detecting means 9, a signal shown in FIG. 5E is output from the output terminal e of the synchronizing signal detecting means 9. The timer means 10 is set by the signal from the terminal e and starts measuring time. The output of the output terminal d of the timer means 10 becomes zero. Then, after T2 seconds, the pulse is output again to the output terminal c and the output terminal d. Hereinafter, the same operation is repeated. That is, the pulse interval of the output terminal c of the timer means 10 is T1
+ T2 = T seconds. The timing at which the pulse is generated is always synchronized with the timer means 4 of the transmitting device. In transmitting and receiving information data, when a synchronization signal is transmitted from the parent device in FIG. 4A to prevent the radio waves between the parent device and the child device from colliding with each other, the information data is transmitted to the child device in FIG. If there is transmission data to be transmitted, transmission means (not shown in FIG. 4B) included in the child device of FIG.
Data is transmitted to the parent device of (A). That is, when the synchronization signal is transmitted from the parent device in FIG.
Data is transmitted from the child device (B).

As described above, the operation state is set at the timing shown in FIG. 5 (C), information data can be transmitted / received to / from the other party, and the power supply is turned off at other times to prevent battery consumption.

[0005]

However, in the above-described conventional configuration, a synchronization signal is transmitted in order to reduce the waiting time from when a request to transmit data to the other party occurs to when the data is actually transmitted to the other party. The time interval between the steps must be reduced. If the time interval for transmitting the synchronization signal is shortened, (1) radio waves are emitted more than necessary, and there is a risk of interfering with other systems. (2) Since the power required for transmission is higher than the power required for reception, the battery capacity of the parent device increases. There was a problem that.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to realize a transmitting / receiving apparatus which can share radio waves with other systems and can reduce average power consumption.

[0007]

To achieve the above object, according to the Invention The transmitting and receiving apparatus of the present invention, the intermittent operation control means for activating the transmitting and receiving operations at certain time intervals, the synchronization signal from the received signal
The operation is started by a signal from the reception signal decoding means for detecting the signal and the intermittent operation control means, and one or a plurality of reception slots and transmission slots for operating the reception means and the transmission means in time series are created. The receiving slot is varied based on a synchronization signal detection signal from the received signal decoding means that has been operated and the transmission slot is changed.
Transmission / reception slot control means for changing the slot position .

[0008]

According to the present invention, since the transmission slots of the parent device and the child device are different during the intermittent operation, the radio waves of the parent device and the child device do not collide. Therefore, it is possible to increase the synchronization signal transmission interval and reduce the intermittent operation interval at which data can be transmitted and received.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1A shows the configuration of the parent device, and FIG. 1B shows the configuration of the child device. The basic configuration is the same for the parent device and the child device, and the same function blocks are given the same numbers. 13 is an antenna, 14 is a receiving means, 15 is a transmitting means, 16 is a received signal decoding means, 17 is a transmitted signal generating means, 18 is a transmission / reception slot control means, and 19 is an intermittent operation control means. FIG. 2A shows a transmission format of a transmission / reception signal exchanged between a plurality of transmission / reception devices of the present invention. As a modulation method, FSK (FREQUENCY S
HIFT KEYING) Transmission speed 4800
Consider bps. As shown in FIG. 2A, the transmission format is 1200 bits for the bit synchronization signal, 31 bits for the frame synchronization signal, 126 bits for the call signal (signal for confirming each other's communication partner), and the control signal (for the transmission format). The signal for transmission format identification information such as the type and the bit length of the transmission format has a 64-bit configuration. The calling signal, the control signal, and the information signal are Manchester encoded. The bit synchronization signal length is 12
00 bits = 250 ms, and 1421 bits = 296 ms from the bit synchronization signal to the control signal. FIG. 2 (B)
FIG. 2 is a timing chart of each output terminal of the transmitting / receiving device of FIG. 1. The operation of the transmitting / receiving device of the present invention will be described with reference to FIG. The intermittent operation control means 19 outputs a timing pulse output a for transmitting and receiving a synchronization signal and a timing pulse output b for exchanging information.
The timing pulse output a is, for example, a pulse train at intervals of 10 minutes, and the timing pulse output b is the timing pulse output a.
, For example, a pulse train at intervals of 30 seconds. In the case of the parent device, the transmission signal generation means 17 is activated by the timing pulse output a and transmits a synchronization signal. The synchronization signal is composed of a bit synchronization signal to a control signal in the transmission format of FIG. On the other hand, in the case of the slave device, the received signal decoding means 1
6 is started to start detecting a synchronization signal from the parent device, and when the synchronization signal is detected, the intermittent operation control means 19 is notified of the detection of the synchronization signal. Then, the intermittent operation control means 19 finely adjusts the internal clock in accordance with the detection of the synchronization signal from the master device.
Generally, the frequency accuracy of a crystal oscillator used for a timepiece is approximately ± 100 ppm including temperature characteristics. Therefore, the difference between the clocks of the parent device and the child device is a maximum of ± 120 ms per 10 minutes. Since the bit synchronization signal has a length of 250 ms, it is possible to sufficiently catch the bit synchronization signal even if the clock is shifted by ± 120 ms. The timing pulse output b activates the transmission / reception slot control means 18 and enables the transmission / reception operation every 30 seconds. The transmission / reception slot control means 18 controls transmission and reception timing. Output c of transmission / reception slot control means 18 (c1 for parent device, c1 for child device =
c2) controls the receiving operation of the receiving means 14. Output d
(D1 for the parent device, d2 for the child device) controls the transmission operation of the transmission means 15. As a specific example, it is assumed that call information is generated from the parent device to the child device. Then the parent device (FIG. 1 (A)) creates a transmission format (FIG. 2 (A)) by the transmission signal generation unit 17 of the parent apparatus, the parent apparatus
To the transmission means 15. Parent In the transmission unit 15 of the parent apparatus
Activation signal d from transmission / reception slot control means 18 on the device side
Wait for one. In the transmission / reception slot control means 18 on the parent device side ,
When the activation pulse b is received from the intermittent operation control means 19 on the parent device side , the activation signal c1 is output to the reception means 14 on the parent device side 120 ms later. When receiving the activation signal c1, the receiving means 14 on the parent device side starts a receiving operation and transmits the received signal to the parent device.
The transmission format (FIG. 2A) is decoded by the reception signal decoding means 16 on the device side . The slot length of the reception slot is variable, and is initially set to a minimum value of 10 msec at which a bit synchronization signal can be detected (assuming that bit synchronization can be detected with about 50 bits). If there is information to be sent from the child device to the parent device, at the timing of d2 in FIG.
A signal of the transmission format of (A) is sent. The reception slot position c1 of the parent device is set so as to be located in the middle of the bit synchronization signal from the child device. Therefore, even if the clock between the parent device and the child device is shifted by ± 120 ms, the parent device can detect whether or not there is a signal from the child device within the range of the bit synchronization signal length of 250 ms. That is, it is possible to detect whether or not there is a bit synchronization signal from the child device during the minimum value of the receiving slot of 10 ms in the start signal c1. Parent dress
When the reception signal decoding means 16 on the device side detects the bit synchronization signal from the slave device, the reception slot length is changed from 10 ms to 30 ms.
The transmission / reception slot control means 18 on the parent device side is instructed to change to 0 ms. If the control signal is detected within 300 ms, the bit length information of the transmission format included in the control signal is notified to the transmission / reception slot control means 18 of the parent device . Then, the transmission / reception slot control means 1 on the parent device side
In step 8, the reception data time length is calculated from the bit length information of the transmission format, and the reception slot length of the output c1 is changed again. At the same time, the output timing of the output d1 is changed after the reception slot of the output c1 ends. On the other hand, when the signal from the child device cannot be detected, the parent device is output by the output d1 .
The transmitting means 15 on the installation side is activated. Upon receiving the activation signal d1, the transmission means 15 on the parent device side starts a transmission operation and transmits a signal in the transmission format (FIG. 2A). The slot length of the transmission slot is variable and set to the transmission format length. The child device performs a reception operation during the reception slot of the signal c2 in FIG. 2B in the same operation as the parent device, and receives a signal from the parent device.

[0010] As shown in FIG. 2 c 3, the parent device and the parent device are configured to output two reception slots at 120 ms intervals.
If the transmission / reception slot control means 18 on the slave device side is configured, the bit synchronization signal of the transmission signal is set to 1200 bits = 25.
It can be shortened from 0 ms to 625 bits = 130 ms. This is because even if the receiving slots are shifted by ± 120 msec, one of the two receiving slots can always capture the bit synchronization signal.

[0011] After exchanging information between the parent device and the child device, if it is desired to further exchange information.
The pulse interval of the output b (b in FIG. 2B) from the intermittent operation control means 19 on the parent device side and the child device side is changed from 30 seconds to, for example, 1 second. As a result, information can be sent to the other party within one second after the information call request is generated. Then, when a series of information exchange is completed, the output b
Is changed to 30 seconds.

FIG. 3 shows an example in which the transmitting / receiving device of the present invention is applied to a gas security system. In FIG.
Is a telephone line terminating device and is generally a T-NCU (TERM
INAL NETWORK CONTROL UNI
T). Reference numerals 21 and 22 denote transmission / reception devices of the present invention. Reference numeral 23 denotes a gas meter called a microcomputer meter having a function of measuring the gas consumption and monitoring the gas usage state and shutting off the gas when it is deemed dangerous. The T-NCU 20 and the transmission / reception device 21 may be housed in one unit. Transmission / reception device 2
2 may be stored in the microcomputer meter 23. When the microcomputer meter 23 determines that the use of gas is abnormal, the microcomputer meter 23 closes the gas shut-off valve provided inside the microcomputer meter and is connected by a telephone line via the transmitting / receiving device 22, the transmitting / receiving device 23, and the T-NCU 20. The gas company's safety monitoring center is notified. Various information for controlling the microcomputer meter can be sent from the safety monitoring center. The transmission / reception devices 21 and 22 have a built-in lithium battery, and can operate for 10 years without battery replacement.

[0013]

As described above, according to the transmission / reception apparatus of the present invention, the reception slot and the transmission slot are arranged in time series during the intermittent operation, and the transmission slot of the child apparatus is provided in accordance with the reception slot of the parent apparatus. Since the reception slot of the child device is provided in accordance with the transmission slot of the parent device, even if a call request is issued to both the parent device and the child device at the same time, radio waves of the parent device and the child device may collide. And information can be transmitted and received normally. Therefore, the transmission of the synchronization signal can be performed only by adjusting the clock, and the transmission interval can be increased. Therefore, the number of times of emission of the radio wave can be reduced, and interference with other systems can be reduced. Further, since the number of times of transmitting and receiving the synchronization signal for clock adjustment is reduced, the battery life can be extended not only in the parent device but also in the child device. Further, by providing a plurality of reception slots, the length of the synchronization signal for clock adjustment can be shortened, so that interference with other systems can be further reduced, and the battery life of the parent device can be further extended. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram of a transmission / reception device according to an embodiment of the present invention.

FIG. 2 is an output diagram of each output terminal in the device.

FIG. 3 is a block diagram showing an example of an application system using the device.

FIG. 4 is a block diagram of a conventional transmitting / receiving apparatus.

FIG. 5 is an output diagram of each output terminal in the device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 14 Receiving means 15 Transmitting means 16 Received signal decoding means 17 Transmission signal generating means 18 Transmission / reception slot control means 19 Intermittent operation control means

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-290025 (JP, A) JP-A-6-284214 (JP, A) JP-A-2-180447 (JP, A) JP-A-63-29 228832 (JP, A) JP-A-5-347790 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 1/40 H04M 11/00 G08C 15/00 H04Q 9/00

Claims (2)

(57) [Claims] An intermittent operation control means for activating a transmission / reception operation at a certain time interval, and a reception means for detecting a synchronization signal from a reception signal.
The operation is started by a signal from the communication signal decoding means and the signal from the intermittent operation control means, and one or more reception slots and transmission slots for operating the reception means and the transmission means in time series are created and operated. Said receiving
A transmission / reception slot control unit that varies the reception slot based on a synchronization signal detection signal from a transmission signal decoding unit . 2. While activating a transmission / reception operation at a certain time interval
A non-operation control means for receiving a synchronization signal from a reception signal;
Signal decoding means and a signal from the intermittent operation control means.
Operation, and the receiving unit and the transmitting unit
One or more receive slots for row operation
Created the receiving and transmitting slots
Based on the signal of the synchronization signal detection from the signal decoding means.
Variable receive slot and transmit slot position
Transmitting / receiving slot control means.
Place.