JPH04309018A - Setting method for reception frequency of master station of radio communication system - Google Patents

Abstract

PURPOSE:To facilitate the setting of a reception frequency of a master station. CONSTITUTION:Communication is implemented from a slave station to a master station 1 in a radio wave unidirectionally. A setting data of a reception frequency is sent from a setting tool 4 at a prescribed carrier frequency to the master station 1. A switch SW1 provided to the master station 1 gives a setting start command. In this case, the master station 1 sets the reception frequency to a frequency at which a transmission signal of the setting tool 4 is receptible and sets the reception frequency based on the reception data.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for setting the receiving frequency of a master station in a wireless communication system used in a security system and transmitting sensor information and the like.

0002

[Background Art] A security system receives a plurality of slave stations to which disaster prevention and crime prevention devices such as disaster prevention sensors and crime prevention sensors are connected, and signals indicating the operating status of each disaster prevention and crime prevention device transmitted from these slave stations. Some devices include one master station that monitors the operating status of each disaster prevention and security device, and perform unidirectional wireless communication from the slave station to the master station. In some wireless communication systems used in this type of security system, a plurality of carrier frequencies can be set in a slave station, and a master station can receive information by identifying various slave stations.

0003

By the way, in the conventional wireless communication system of this type, a dip switch is used to set the reception frequency of the master station, and the carrier frequency is set by several bits of data by the dip switch. However, since this type of DIP switch is installed inside the casing of the master station, it is necessary to remove the cover that makes up the casing each time to set the reception frequency, making the setting operation cumbersome. There was a problem.

The present invention has been made in view of the above points, and an object thereof is to provide a method for setting the reception frequency of a master station in a wireless communication system, which allows the reception frequency to be easily set. be.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a receiving frequency setting device that transmits data for setting a receiving frequency to a master station on a specific carrier frequency, a setting means for setting the receiving frequency of the master station to a receiving frequency for receiving the transmission signal from the receiving frequency setting device, and setting the receiving frequency to a frequency based on data from the receiving frequency setting device; The master station is provided with reception frequency setting means for setting the reception frequency.

[0006]

[Operation] The present invention enables the reception frequency of the master station to be set from outside by transmitting data for setting the reception frequency from the reception frequency setting device to set the reception frequency of the master station as described above. This makes it easy to set the receiving frequency.

[0007]

Embodiment FIGS. 1 to 5 show an embodiment of the present invention. FIG. 2 shows a security system as an example to which the present invention is applied. In this security system, the slave station 2 is connected to disaster prevention sensors (fire sensors, gas leak alarm sensors, etc.), crime prevention sensors (intrusion warning sensors, etc.), and disaster prevention and crime prevention devices such as emergency push buttons and emergency call devices. , and one master station (controller) 1 that receives transmission signals indicating the operating states of various sensors transmitted wirelessly from these slave stations 2 and monitors the operating states of the sensors. The master station 1 is equipped with a display section that individually displays the operating status of each sensor, and has the function of not only issuing an alarm when an abnormality occurs, but also reporting the abnormality to, for example, a family member's place of work via a telephone line. .

FIG. 5 shows an example of the configuration of the slave station 2.
Oscillator 211, frequency divider 221, phase comparator 231
, a low-pass filter 241, a VCO 251, a prescaler 261, and a programmable frequency divider 271. Here, the carrier frequency of this slave station 2 is determined by the CPU that controls the frequency division ratio of the prescaler 26.
Setting is possible by controlling at 28. A modulated signal indicating sensor information is converted into a voltage signal by the SpF 29 and given to the VCO 25, the carrier wave is modulated by the VCO 25, and this transmission signal is sent to the preamplifier 30 and the power amplifier 31.
and is transmitted from the antenna 33 via the bandpass filter 32.

FIG. 4 shows an example of the configuration of the master station 1.
This master station 1 also uses a PLL section a2 having the same configuration as the slave station 2 side, and the signal received by the antenna 11 is passed through the bandpass filter 12 and the RF amplifier 13 to the first mixer 14.
1, and the PLL section a2 is input to this first mixer 141.
The output of the first mixer 1 is given as the first local oscillation signal.
41, the frequency of the received signal is lowered to a first intermediate frequency, and this first intermediate frequency is passed through the band pass filter 15 and the I
input to the second mixer 142 via the F amplifier 16,
It is mixed with a second local oscillation signal outputted from the oscillator 17 to further reduce the frequency to a second intermediate frequency, and this second intermediate frequency is demodulated by the demodulator 18 to obtain a detection output via the low-pass filter 19. This detection output is input to the control CPU 20, and processes for determining the occurrence of a fire, the presence of an intruder, etc. are executed. In this master station 1, the programmable frequency divider 27
By changing the frequency division ratio of 2, the receiving frequency can be changed.

[0010] The above configuration is an explanation of the circuit configuration necessary for transmitting information, but in the case of this embodiment, the configuration as a reception frequency setting device is used to set the reception frequency of the master station 1. Equipped with tool 4. This setting tool 4 is used to set the reception frequency of the master station 1 to a desired frequency, and performs transmission at a specific transmission frequency (f1). In order to be able to set the receiving frequency using the setting tool 4, the master station 1 is provided with the following configuration. In other words, while enabling the master station 1 to set the receiving frequency,
A setting means is provided for setting the receiving frequency of the master station 1 to a receiving frequency for receiving the transmission signal from the installation tool 4, and in the case of this embodiment, this setting means is provided on the outer surface of the casing of the master station 1. A switch SW1 is used.

A method of setting the receiving frequency of the master station 1 according to this embodiment will be explained below. Note that this setting is performed at the time of system setting. First, when making this setting, as shown in FIG. 2(b), the switch SW1 of the master station 1 is
Press. As a result, a setting start command is given to the CPU 20, which serves as reception frequency setting means for setting the reception frequency. At this time, the CPU 20 adjusts the frequency division ratio of the programmable frequency divider 272 of the PLL synthesizer circuit a2 so that the switch SW
The reception frequency of the master station 1, which was in an undefined state before the operation in step 1, is brought into a state in which it can receive the transmission signal from the setting tool 4.

In this state, as shown in FIG. 3(a), when the transmission switch SW2 provided on the setting tool 4 is pressed, the data regarding the receiving frequency stored in advance in the setting tool 4 is transmitted to the master station 1. . The CPU 20 of the master station 1 which has received the received data identifies the data and adjusts the frequency division ratio of the programmable frequency divider 272 so that the reception frequency is based on the data. As a result, the receiving frequency of the master station 1 is set to a predetermined frequency (f3 in the case of FIG. 2(d)) as shown in FIG. 2(d).

[0013] If the receiving frequency of the master station 1 is set using the setting tool 4 in this way, there is no need for troublesome setting operations such as setting dip switches. For example, there is no need to remove the cover that makes up the casing like a DIP switch normally installed inside the casing of the master station 1, and the settings can be easily performed, and if the installation tool 4 is used, If the receiving frequency to be set in advance is stored in a memory provided inside the setting tool 4, setting errors will not occur and reliable setting will be possible.

By the way, in the above case, the switch SW2
was provided in the master station 1 to give a command to start setting the receiving frequency in the master station 1. For example, when a signal is applied to the connection terminal connected to the master station 1,
The signal may be used to issue a command to start setting the reception frequency.

[0015]

Effects of the Invention As described above, the present invention includes a receiving frequency setting device that transmits data for setting a receiving frequency to a master station on a specific carrier frequency, and enables the master station to set the receiving frequency. , a setting means for setting the reception frequency of the master station to a reception frequency for receiving the transmission signal from the reception frequency setting device, and a reception frequency setting means for setting the reception frequency to a frequency based on data from the reception frequency setting device. Since it is provided in the master station, the receiving frequency can be set externally by transmitting data for setting the receiving frequency from the receiving frequency setting device, and the receiving frequency can be easily set.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the configuration of main parts of a setting tool and a master station according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the same operation as above.

FIG. 3 is a configuration diagram of a security system including the above.

FIG. 4 is a circuit configuration diagram of a master station.

FIG. 5 is a circuit configuration diagram of a slave station.

[Explanation of symbols]

1. Master station 2.Slave station 4 Setting tool SW1 Switch

Claims (1)

[Claims] [Claim 1] Disaster prevention such as disaster prevention sensors and crime prevention sensors,
It is equipped with a plurality of slave stations to which crime prevention devices are connected, and a master station that receives signals indicating the operational status of each disaster prevention and crime prevention device transmitted from these slave stations and monitors the operational status of each disaster prevention and crime prevention device. , a wireless communication system in which communication is performed in one direction wirelessly from a slave station to a master station, and the carrier frequency and reception frequency can be set appropriately by using synthesizer circuits in the transmitting circuit of the slave station and the receiving circuit of the master station, respectively, It is equipped with a reception frequency setting device that transmits data for setting the reception frequency to the master station on a specific carrier frequency, and enables the master station to set the reception frequency, and also sets the reception frequency of the master station from the reception frequency setting device. wireless communication characterized in that a master station is provided with a setting means for setting a reception frequency for receiving a transmission signal, and a reception frequency setting means for setting the reception frequency to a frequency based on data from a reception frequency setting device. How to set the receiving frequency of the system's master station.