JPH0613946A - Security wireless transmitter provided with test transmission function - Google Patents

Abstract

PURPOSE:To easily discriminate the radio wave arrival range and its margin for two antennas by providing a test transmission means driving individually the two antennas to send a horizontally/vertically polarized wave signal. CONSTITUTION:A wireless transmitter A having two polarized wave diversity antennas ANT1, 2 is provided with a transmission test means 6. The transmission test means 6 is provided with a function driving individually the two antennas ANT1, 2 to send the horizontally/vertically polarized ware signal and a test mode switch SW is provided to a TEST terminal of a dedicated IC being a component of a signal processing section 4. The transmission test means 6 executes a program prepared in advance by the signal processing section 4 to drive the two antennas ANT1, 2 thereby executing the test of a radio wave. Since the strength of the radio wave generated is easily measured for each antenna by a radio wave test equipment by executing the test transmission prior to the installation of the wireless transmitter A, the antenna is easily checked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables two antennas to alternately transmit horizontal and vertical polarization security signals when an attached sensor detects an abnormality or operates a transmission switch. Security wireless transmitter improvements.

[0002]

2. Description of the Related Art Recently, in a wireless security system using weak radio waves, two antennas are provided in order to increase the sensitivity of the radio signal considering the directivity.
There is one that uses a wireless transmitter that alternately emits horizontal and vertical polarization signals from these two antennas. When installing such a wireless transmitter to configure the system, the place to install It was customary to carry out the troublesome method of placing the wireless transmitter in the drive and driving it, checking the operation of the wireless receiver, moving it, and selecting the optimum installation location.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and the radio signals radiated from individual antennas can be transmitted without moving the installation location of the wireless transmitter variously. It is an object of the present invention to provide a wireless transmitter that makes it possible to easily find the radio wave reaching distance and the margin for each antenna by measuring using a radio wave tester or the like.

[0004]

The wireless transmitter of the present invention, which is proposed to achieve the above object, uses a polarization diversity method to generate an abnormal signal from two antennas when a sensor detects an abnormality. It is an improvement of the wireless transmitter that alternately emits in the form of radio signals, and is characterized by having a test transmission means for individually driving two antennas to emit horizontal and vertical polarization signals. I am trying.

The wireless transmitter of the present invention as described above is
It can be implemented by variously changing the function and configuration of the test transmitting means. The first one has a test mode switch,
An antenna to be tested can be designated by operating this test mode switch, and horizontal and vertical polarization signals are transmitted from the designated antenna (claim 2).

In the second type, when the test mode switch is operated, the two antennas are alternately driven according to a program prepared in advance so that no horizontal modulation occurs.
The third embodiment has a structure in which vertically unmodulated, horizontally modulated, and vertically modulated signals are sequentially transmitted (Claim 3), and the third one is an opening provided in a signal processing unit inside the wireless transmitter instead of the test mode switch. The terminal is used as a substitute (claim 4).

[0007]

The wireless transmitter of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing the internal configuration of a battery-powered wireless transmitter. In this figure, a signal processing unit 4 is configured by a dedicated IC, and a contact switch SWa, a tamper switch SWb, a test mode switch SW described later, and a voltage detector 5 for detecting a dead battery are connected to each terminal of the dedicated IC. Further, a transmission mode selection switch SWc for selecting the transmission mode of the security signal transmitted from the wireless transmitter is connected, and the crystal unit 1 is connected to the voltage control terminal.
Oscillation circuit 12 using basic vibration of 1 and multiplication circuit 2
Is connected to the data terminal, and an AM modulation circuit 3 for modulating the high frequency signal output from the multiplication circuit 2 is connected to the data terminal.
, And two antennas ANT1 and ANT2 are connected to the antenna terminals A1 and A2. The LED is a test mode display lamp that lights up when performing the test transmission described below and notifies the step to be executed in advance.

Here, the contact switch SWa is closed when an externally attached fire sensor or security sensor detects an abnormality, and the tamper switch SWb is detached from the place where the external sensor cover or the sensor itself is installed. The transmission mode selection switch SWc defines the transmission mode of the security signal, that is, whether the security signal transmitted when the sensor detects an abnormality is transmitted one time or repeatedly. Further, the voltage detector 5 constantly detects the voltage level of a battery (not shown) which is a drive source of the wireless transmitter, and when the voltage level falls below a predetermined value, the signal processing unit 4 detects this state. It detects and outputs the battery dead signal from the data terminal. The dedicated IC that constitutes the signal processing unit 4 is also provided with an ID code setting terminal for setting an ID code added to the security signal (not shown).

According to this structure, the sensor detects an abnormality and the contact SWa is closed, and the tamper switch S
When Wb is closed or the voltage detector 5 outputs a dead battery signal, the signal processing unit 4 outputs a drive signal from the voltage control terminal to drive the oscillation circuit 12 and the multiplication amplifier circuit 2 to generate a high frequency oscillation circuit. Since the antennas are driven, the two antennas ANT1 and ANT2 radiate horizontally and vertically polarized signals alternately. At this time, the signal output from the data terminal undergoes AM modulation, and as a result, data is added to the ID code. A security signal having the added format as shown in FIG. 2 is transmitted in the form of a radio wave signal.

By the way, the feature of the wireless transmitter of the present invention is that two such polarization diversity antennas AN are provided.
Transmission test means 6 for wireless transmitter having T1,2
It is characterized by the provision of. Such a transmission test means 6 has a function of individually driving the two antennas ANT1 and ANT2 to emit horizontal and vertical polarization signals. In FIG. 1, a dedicated IC configuring the signal processing unit 4 is provided. TE
Although the ST terminal is provided with a test mode switch SW, such a transmission test means 6 executes the program prepared in advance by the signal processing section 4,
The two antennas ANT1 and ANT2 are driven to perform a radio wave test as described below. Further, the test transmission means 6 may be provided with an open terminal of a dedicated IC that constitutes the signal processing unit 4 instead of the test mode switch SW, and can be executed when the open terminal is short-circuited. With such a configuration, the switch for executing the test mode is provided in the signal processing unit built into the wireless transmitter main body, so that it cannot be used by end users without permission, only by the contractor. Become.

Here, the first mode of the radio wave test executed by the transmission test means 6 is two antennas ANT.
Select one of 1 and 2 and turn on the electric wave tester in the surrounding area during the time when the horizontal or vertical unmodulated polarization signal output from the double amplification circuit 2 is transmitted. This is done by measuring intensity. by the way,
In a wireless transmitter that employs a polarization diversity method and transmits a security signal, one of the two antennas ANT1 and ANT2 forms a horizontal polarization plane and the other forms a vertical polarization plane. Since the antennas ANT1 and ANT2 to be driven are selected, the intensities of the horizontally polarized wave and the vertically polarized wave can be easily measured because they are provided.

Further, another mode of the radio wave test executed by the transmission test means 6 is performed by driving the signal processing section 4 with a program prepared in advance when the test mode switch SW is operated. By alternately driving the two antennas ANT1 and ANT2, horizontal non-modulation,
This is done by measuring the surrounding radio field strength when a vertically unmodulated, horizontally modulated, or vertically modulated signal is transmitted by a radio wave tester.

Steps 100 to 104 in FIG. 3 show an execution procedure of the test program executed at this time, and FIG. 4 shows an execution procedure at that time in a time chart. The program execution procedure, b) corresponds to the lighting mode of the LED. When the test mode switch SW is operated, the signal processing unit 4 determines that it is in the test mode. Therefore, step 1 is executed after a lapse of a predetermined rest time. At this time, since the LED lights up only once during the rest time, the operator can detect the execution of step 1 in advance. In step 1, the horizontal unmodulated radio wave is output for a fixed time.

Next, in the rest time, after the LED is turned on twice, step 2 is executed, vertical non-modulated radio waves are output for a certain time, and after the rest time, the LED is turned on three times, Step 3 is executed. Step 3
Then, the horizontal modulated radio wave is output, and when it ends, a predetermined rest time is entered and the LED is turned on four times, then the last step 4 is executed and the vertical modulated radio wave is output.

As described above, in the second test, the horizontal non-modulation signal, the vertical non-modulation signal, the horizontal modulation signal, and the vertical modulation signal are interleaved with a predetermined period of quiescent time, and steps 1 to 4 are performed for a certain time. Since it is output, if the radio wave intensity around the wireless transmitter is measured using the radio wave tester during this time, it is not necessary to select the installation place one by one when installing the wireless transmitter. In addition to turning on the LED, the buzzer may sound, and in that case, varying the number of times the buzzer sounds in accordance with the execution of steps 1 to 4 is particularly effective for alerting the operator. Is.

FIG. 5 shows the step 5 executed as the test mode, in which the actual security signal is the two antennas ANT1 and ANT2 as the horizontal polarization signal H and the vertical polarization signal V. Since they are output alternately, a more useful radio wave test can be performed in actual use.

[0017]

As described above, according to the wireless transmitter of the present invention, the two antennas are driven individually and the horizontal,
Since the test transmission means for generating the vertically polarized signal is provided, if the test transmission is performed prior to the installation of the wireless transmitter, the radio wave intensity generated by the radio wave tester can be easily measured for each individual antenna. Therefore, the antenna can be easily inspected. Therefore, by driving the wireless transmitter and checking the response of the receiver one by one, the troublesomeness of the conventional method of moving the wireless transmitter to decide the installation location is eliminated, and the electric field strength distribution centered on the installation location is eliminated. Since it can be easily measured, the output adjustment for each antenna becomes easy, and the reliability of the security wireless system can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an internal configuration of a wireless transmitter of the present invention.

FIG. 2 is a format diagram of a security signal.

FIG. 3 is a flowchart showing a procedure of a transmission test executed by a test transmission unit.

FIG. 4 is a time chart showing an operation procedure of a transmission test (steps 1 to 4) executed by the test transmission means.

FIG. 5 is a time chart showing an operation procedure of a transmission test (step 5) executed by the test transmission means.

[Explanation of symbols]

 A ... Wireless transmitter of the present invention SW ... Test mode switch 4 ... Signal processing unit 6 ... Test transmission means ANT1, 2 ... Antenna

[Procedure amendment]

[Submission date] June 3, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Okada 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd.

Claims (4)

[Claims] 1. A wireless transmitter in which an abnormal signal is alternately transmitted from two antennas in the form of a radio wave signal by a polarization diversity method when the sensor detects an abnormality. A security wireless transmitter having a test transmission function, which is equipped with a test transmission means for individually driving to emit horizontal and vertical polarization signals. 2. The security wireless transmitter according to claim 1, wherein the test transmission means has a test mode switch,
A security wireless transmitter with a test transmission function configured to transmit either horizontal or vertical polarization signals from the selected and designated antenna by operating this test mode switch. 3. The security wireless transmitter according to claim 1, wherein the test transmission means has a test mode switch,
When this test mode switch is operated, the above 2
Horizontal unmodulated, vertical unmodulated, horizontal modulated from one antenna,
A security wireless transmitter equipped with a test transmission function configured to automatically transmit each signal of vertical modulation according to a program prepared in advance. 4. The test transmission means has a test transmission function configured to have an open terminal provided in a signal processing unit inside a wireless transmitter, instead of the test mode switch. The security wireless transmitter according to any one of 1.