JPH10257033A - Wireless device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability of a wireless sensor. SOLUTION: State data showing that a mobile object is detected is generated when the mobile object is judged to be detected, furthermore, the state data is defined as an actual data part by repeating the state data three times and the actual data to which a bit synchronization signal, a frame synchronization signal and a calling signal are added is transmitted by radio by the wireless sensor. Time-appointed information is performed in the same way. In addition, the calling signal is also transmitted between the pieces of state data to be transmitted in the actual data part. Furthermore, a synchronization signal is also transmitted next to the state data to be transmitted in the actual data part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless device for transmitting predetermined information wirelessly, such as a wireless hot-wire sensor, and more particularly to a format of transmission data.

[0002]

2. Description of the Related Art In recent years, wireless sensors have been actively developed. FIG. 4 shows a schematic configuration of the wireless sensor. In FIG. 4, 1 is a sensor head, 2 is a control unit,
Reference numeral 3 denotes a transmitting unit, 4 denotes a battery, and 5 denotes an antenna. Note that the wireless sensor may be a wireless hot-wire sensor, a wireless magnet switch, a wireless fire sensor, or another wireless sensor. In short, a predetermined state is detected. Any wireless sensor may be used, but it is assumed here that the sensor is a wireless hot-wire sensor. Although only one wireless sensor is shown in FIG. 4, this is representatively shown for the sake of simplicity, and in practice, a plurality of wireless sensors are usually installed. It is.

In the case of a wireless hot-wire sensor, the sensor head 1 includes an optical system including a pyroelectric element, a reflecting mirror for forming a warning zone, and an amplifier for amplifying an output signal from the pyroelectric element. And a signal processing circuit for performing predetermined signal processing. Since the signal processing in the heat ray sensor is well known, detailed description will be omitted.

A battery 4 serves as a power source of the wireless sensor, and supplies a necessary power source voltage and power source current to the sensor head 1, the control unit 2, and the transmission unit 3.

The control unit 2 is constituted by a processing unit using a microprocessor, and when it determines that a moving object has been detected based on a signal from the sensor head 1, it generates information indicating that the moving object has been detected. The information is wirelessly transmitted from the transmission unit 9 as state data.

The format of a signal transmitted from a wireless sensor is usually such that a bit synchronization signal is arranged at the head, a frame synchronization signal is arranged next, as shown in FIG.
Next, the call signal is arranged, and then the actual data section is arranged. Then, the status data is arranged in the actual data section. The call signal is a signal for transmitting an ID number assigned to each of the wireless sensors. Naturally, the maximum widths of the bit synchronization signal, the frame synchronization signal, the call number, and the number of bits of the actual data portion are predetermined.

Therefore, when the control unit 2 determines that a moving object has been detected based on a signal from the sensor head 1, it generates information indicating that the moving object has been detected, and uses this information as state data, A synchronization signal, a frame synchronization signal, and a call signal are added, and the signal is wirelessly transmitted from the transmission unit 3 as a signal in the format shown in FIG.

If the control unit 2 is set to perform the periodic notification, when the time for performing the periodic notification arrives, status data indicating that the notification is the periodic notification is generated, and this status data is executed. As shown in FIG. 5, a data section is provided with a bit synchronization signal, a frame synchronization signal, and a call signal.
Is transmitted wirelessly from the transmitting unit 3 as a signal having the format shown in FIG.

In the above, the case of a wireless heat ray sensor has been described. Similarly, when the wireless sensor is a wireless magnet switch, the window or door to which the magnetic switch is attached is opened. In this case, information indicating that the window or door has been opened is wirelessly transmitted as state data, and if the wireless sensor is a wireless fire sensor, a fire has been detected from the sensor head 1. Is output, the control unit 2 wirelessly transmits information indicating the occurrence of a fire as state data.

[0010] Further, when the wireless magnet switch and the wireless fire sensor are set to perform a periodic notification, the control unit 2 determines the time at which the periodic notification is performed, as described above. Is generated, status data indicating that it is a periodic notification is generated, and this status data is used as a real data portion, and a bit synchronization signal, a frame synchronization signal, and a call signal are added thereto, and a signal having a format shown in FIG. It goes without saying that the transmission section 3 performs radio transmission.

The signal wirelessly transmitted from the wireless sensor is received by a device (not shown; this device is hereinafter referred to as a receiving device) for receiving a signal wirelessly transmitted from the wireless sensor.

[0012]

However, in the conventional wireless sensor, the status data is transmitted only once, so that if a radio wave interference or the like occurs during the transmission of the status data, the reception device normally operates. Could not be received.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a wireless device that can improve the possibility of being received by a receiving device even when there is radio wave interference or the like. is there.

[0014]

In order to achieve the above object, a wireless device according to the present invention is a wireless device for wirelessly transmitting data in a predetermined format, wherein status data is stored in an actual data portion of the data to be transmitted. Is transmitted a plurality of times.

Here, a call signal assigned to itself may be transmitted between the state data, or a synchronization signal may be transmitted next to the state data.

Further, such a wireless device can be applied to a wireless sensor.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. In the following, a case where the present invention is applied to a wireless hot-wire sensor will be described.

The configuration of the wireless hot-wire sensor is the same as that shown in FIG. 5, but the format of the signal transmitted in the actual data section is different.

That is, when the control unit 2 determines that a moving object has been detected based on a signal from the sensor head 1, it generates state data indicating that the moving object has been detected, and further stores this state data in FIG. As shown in the figure, the actual data portion is repeated three times, to which a bit synchronization signal, a frame synchronization signal, and a calling signal are attached, and the transmission portion 3 wirelessly transmits the signal in the format shown in FIG.

The same applies to the case where the periodic notification is made. When the time for performing the periodic notification arrives, the control unit 2 generates status data indicating that it is a periodic notification, and furthermore, this status data is converted as shown in FIG. The actual data section is repeated three times, and a bit synchronization signal, a frame synchronization signal, and a call signal are added to the actual data section.

As described above, according to this wireless sensor, the status data is repeatedly transmitted a predetermined number of times in the actual data portion, so that the reception device can receive the status data even if there is radio interference. The reliability is higher than before, and the reliability of the wireless sensor can be improved.

Further, as shown in FIG. 2, a call signal may be transmitted between state data transmitted in the actual data section. According to this, the first paging signal, that is, the paging signal transmitted in the actual data section even when the receiving apparatus cannot normally receive due to radio wave interference when the next paging signal after frame synchronization is transmitted Is more likely to be received.

Further, as shown in FIG. 3, a synchronization signal may be transmitted next to the status data transmitted in the actual data section. Although the synchronization signal can be arbitrarily determined, it is needless to say that the synchronization signal needs to be recognizable by the receiving device. In this way, even if bit synchronization and frame synchronization cannot be normally received by the receiving device due to radio interference, if the synchronization signal transmitted in the actual data part can be received, the call signal and status data can be normally received. Because it is possible, reliability is improved.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.
Various modifications are possible. For example, in the above description, the state data is repeatedly transmitted three times in the actual data part. However, the present invention is not limited to three times.
The same state data may be transmitted a plurality of times repeatedly.

In the above description, a wireless sensor has been described. However, the present invention is not limited to a wireless sensor, but can be generally applied to a wireless device that wirelessly transmits predetermined information.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a data format of an actual data portion wirelessly transmitted in a wireless device according to the present invention.

FIG. 2 is a diagram showing another example of the data format of the actual data portion wirelessly transmitted in the wireless device according to the present invention.

FIG. 3 is a diagram showing still another example of the data format of the actual data portion wirelessly transmitted in the wireless device according to the present invention.

FIG. 4 is a diagram illustrating a configuration example of a wireless sensor.

FIG. 5 is a diagram showing a format of a signal transmitted by a wireless sensor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Sensor head, 2 ... Control part, 3 ... Transmission part, 4 ... Battery, 5 ... Antenna.

Claims (4)

[Claims] 1. A wireless device for wirelessly transmitting data in a predetermined format, wherein the wireless device transmits status data a plurality of times in an actual data portion of the data to be transmitted. 2. The wireless device according to claim 1, wherein a self-assigned paging signal is transmitted between the state data. 3. The wireless device according to claim 1, wherein a synchronization signal is transmitted after the status data. 4. The wireless device according to claim 1, wherein the wireless device is a wireless sensor.