JPH06276180A - Wireless transmitter-receiver - Google Patents

Abstract

PURPOSE:To evade the deadlock of control signals and to smoothly perform transmission/reception even when a channel is congested by generating retransmission timers from ID codes intrinsic to equipments when the wireless signals of different call origination sources collide. CONSTITUTION:When a response (ACK) from an opposite party for its own transmission can not be received within a stipulated time, the control part 10 of a remote controller 6 judges that signal collision occurred and moves to a retransmission processing. The retransmission timer is generated from the ID code which is a numerical string intrinsic to the equipment. Thus, the retransmission timer after the signal collision is a length intrinsic to the call origination source and no identical time is present. Thus, a retransmission order is automatically decided and recollision can be prevented. Also, when the adjacent equipments simultaneously start the transmission/the reception and a power failure by which communication collision can be presumed is to be recovered, the order of the transmission/reception can be controlled beforehand by using the retransmission timers generated from the ID codes and the signal collision can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless transmission / reception device for performing control communication between a remotely installed instrument and a controller by using a wireless signal.

[0002]

2. Description of the Related Art FIG. 3 shows a remote control system using a wired two-core cable as a conventional contention transmission / reception means. In FIG. 3, reference numeral 1 is a remotely installed instrument, and 2 to 4 are controllers. The device and the controller, which are the respective nodes in this communication system, have their own resending timers in the storage means built therein. FIG. 4 is a flowchart when a signal collision occurs in the communication system. Retransmission is performed in the order in which the timers in each node are up after collision detection.

With the above configuration and operation, in the conventional wired two-core transmitting / receiving means, the node to be connected can be defined in advance, so that the retransmission timer can be controlled by the retransmission timer unique to each node, and the retransmission sequence can be controlled again. It was preventing a collision.

[0004]

However, when a wireless signal is used for communication, it is necessary to consider transmission / reception from / to each node of an adjacent homogeneous system, and to prepare for a collision.
It is necessary to set a timer that is not limited to the system used.

Further, when the power is restored, the state of each device changes, so that there is a problem that the transmission always starts all at once and the probability of collision becomes the highest.

Therefore, the present invention provides a wireless transmission / reception apparatus which can perform retransmission control well when a transmission signal collides, and can prevent a collision in advance at the time of power failure recovery in which a signal collision is inferred without fail and smooth communication can be realized. .

[0007]

In order to achieve the above object, the means of the wireless transmission / reception apparatus of the present invention comprises a controller for instructing a remotely installed instrument to operate, and a wireless signal for transmitting information between the instrument and the controller. Transmission / reception means for converting to and communicating with, and ID provided for device identification
A code storage means and a means for generating a timer based on the ID code are provided.

[0008]

According to the present invention, when the wireless signals of different transmission sources collide with each other, the retransmission timer is generated from the ID code which is a numerical sequence unique to the device. Therefore, the retransmission timer after the signal collision has a length unique to the transmission source, and the same time does not exist. Therefore, the resending order is automatically determined, and collisions can be prevented again.

Further, when the adjacent appliances start transmitting and receiving all at once and recover from a power failure in which a communication collision is suspected, the ID
By using the retransmission timer generated from the code, it is possible to control the order of transmission and reception in advance and prevent signal collision itself.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a wireless transmitting / receiving apparatus of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment in which the present invention is applied to a domestic gas water heater, and 5 is a water heater, which is operated by a remote controller (hereinafter also referred to as a remote controller) 6.
The water heater 5 and the remote controller 6 are respectively provided with a main body transmitter / receiver 7 and a remote controller transmitter / receiver 8 that transmit and receive wireless signals to and from each other. Since small electric power radio waves are used for transmission and reception, an ID code is assigned to each mass-produced device based on the Radio Law. The water heater 5 is provided with a control unit 9 which is operated by a commercial power source, and the remote controller 6 is provided with a control unit 10 which is operated by a battery, and each has a built-in memory IC and stores the ID code.

The operation of the wireless transmission / reception apparatus of the present invention will be described based on the above configuration. The operation signal of the remote controller 6 for moving the water heater 5 is sent from the remote controller transceiver 3 to the FS.
Radio waves are output using K. Since the carrier frequency of this control signal is only 400 MHz for one water heater, there is a possibility that it may collide with the signal of another adjacent remote controller (not shown). Normally, the remote controller 6 constantly monitors the line from the transmission / reception unit 8 and confirms that the line is empty, and then the control unit 10 starts the transmission process. However, as the number of adjacent water heaters increases, the probability of simultaneous transmission increases. In this case, the control unit 10 of the remote controller 6 determines whether or not a collision is detected by receiving a response (ACK) from the other party to the transmission of the collision within a specified time. That is, when the ACK cannot be received, it is determined that there is a signal collision, and the control unit 10 of the remote controller 6 shifts to the retransmission processing.

The retransmission timer is defined as "transmission interval is 2 seconds or more" by the standard of specific low power. However, when all the remote controllers that have collided retransmit after 2 seconds, once the transmission collision occurs, the collisions continuously occur. Therefore, the transmission interval is shifted in the processing described below.

(1) The basic timer for retransmission is set to 2.5 seconds. If the ACK cannot be received, the transmission is performed four times in succession.

(2) The delay time from the basic timer is determined during the fourth retransmission. The calculation formula is 2.5 seconds + 0.5 x A
Seconds. A is an ID given to each remote control transceiver
It is the first digit below the code. If the ACK cannot be received, the transmission is performed four times in succession.

(3) During the fourth retransmission, the delay time from the basic timer is determined. The calculation formula is 2.5 seconds + 0.5 x B
Seconds. B is an ID given to each remote control transceiver
It is the second digit below the code.

If no ACK is received, the same process is repeated while increasing the number of digits of the ID code.

As described above, by generating the timer from the ID code unique to the remote controller, different timers always appear at the time of retransmission after the signal collision, and it becomes possible to get out of the mutual signal collision.

Further, a water heater 5 in which a communication collision is expected
Regarding the transmission processing when the control unit 6 recovers from a power failure, the signal collision itself can be prevented in advance by starting from the retransmission processing (2) in advance.

[0020]

As described above, according to the first aspect of the present invention, the wireless transmission / reception device generates a device-specific timer from an ID code for device identification, and when a control signal for wireless communication collides. In order to prevent re-collision, by playing back after setting the time lag by the unique timer, even if the line is congested in wireless communication, the deadlock of the control signal is avoided and smooth transmission and reception is realized. Plan.

Further, according to claim 2, when the power is restored,
By preliminarily providing a different time lag for each device by the individual timer and transmitting, the initial setting can be smoothly performed without signal collision with the adjacent device.

[Brief description of drawings]

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

FIG. 2 is a retransmission flowchart of the device.

FIG. 3 is a configuration explanatory view of a conventional wired 2-core remote control communication device.

FIG. 4 is a retransmission flowchart of a conventional remote control communication device.

[Explanation of symbols]

 5 Water heater 6 Remote controller 7 Main unit transceiver 8 Remote controller transceiver 9, 10 Controller

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masahiko Yamamoto 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A controller for instructing a remotely installed instrument to operate, a transmission / reception means for converting information between the instrument and the controller into a wireless signal for communication, and an ID code provided for instrument identification and storing an ID code. A storage means and a timer generation means for generating a timer by the ID code are provided, and when a wireless signal collides,
A wireless transmission / reception device that retransmits a wireless signal by providing a time lag by the timer generation means. 2. A wireless transmission / reception device for transmitting a wireless signal to a remotely installed instrument by providing a time lag by a timer generation means when the power is restored.