JPS62250740A - Data transmission system - Google Patents

Abstract

PURPOSE:To execute the data transmission of plural transmitters with one transmitter and to prevent the useless same transmission by forming a wireless transmitter which can be repeatedly transmitted, controlling the transmitting starting by the strength of a signal and when the data of the transmitting stand-by are transmitted from others, cancelling the transmission. CONSTITUTION:For a wireless receiver 4 of respective data transmitter 2, a so-called inherent channel to the signal from any wireless transmitter 5 is not set. The transmitting timing of a data transmission signal is controlled by a collision preventing means 21. When the signal is received by the receiver 4, a transmitting starting control means 22 immediately detects a receiving level (m) and when (m) is a constant level or above, the received data are data-transmitted. On the other hand, when the level (m) is constant or below, '1' is added to (m), a data transmitting means 20 is controlled so as to delay the transmission only for a constant time. A transmitting cancelling means 23, the data to stand by the self-transmission are transmitted from other data transmitting machines 2, cancells the transmission and prevents an overlapped data transmission.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a data transmission system that time-division multiplex transmits data from a wireless transmitter to a plurality of data receivers.

[Background Art] Conventionally, this type of data transmission system that time-division multiplex transmits data to a plurality of data receivers connected to the same transmission line, as shown in FIG. Data receiver M8!1 and wireless receiver 4 y4:
When the repetition switch SW is turned on, the wireless signal (optical signal, radio wave, etc.) transmitted from the wireless transmitter 5 is transmitted by the wireless receiver fi4. Receive (fl) the data sent by the wireless signal only once to the data transmitter 2.
A data transmitting means 20 for transmitting data from a predetermined data receiver 1 via a transmission R3, and a data transmitting means 20 for transmitting data from another data transmitter 2 h. It transmits its own data transmission signal for a predetermined time (transmission time of 1 packet data or i
! Collision prevention means (CS M D
/ CD (Carrier SenseMultip
le Access / Co11ision Det
Collision prevention means) 21 were provided.

Figure fjS4 is a 70-chart showing the operation of the above conventional example, and data transmission! pi2 wireless transmission ll15
The presence or absence of a wireless signal transmitted from the terminal is constantly checked, and when a wireless signal is received, a data transmission signal consisting of address data for accessing a predetermined data reception 8!1 and the received data is transmitted. It looks like this.

By the way, in such a conventional example, the wireless transmitter/receiver 4 and 5 also have their own channels set, and the wireless transmitter 5 and the wireless receiver 4
Since the data transmitter 2 and the data receiver 1 each had a 1:1 correspondence, for example, when transmitting control data for inverting the lighting load as transmission data, It is necessary to transmit a load reversal signal using the wireless transmission fi5 corresponding to the data receiver M1 to which the lighting load Ll is connected, and each lighting load Ll
+, Lz, . . ., data transmission fi2 and wireless transmitter 2 are required. When the channels are fixed in this way, many wireless transmissions8!5 are required when controlling a large number of lighting loads, and
There was a problem in that data transmission could only be performed via a specific wireless reception 1914. Therefore, as shown in FIG. 5, from the address data AD and transmission data CD (control data for inverting the lighting load LllL2...) of the data receiver 1 arbitrarily set from the wireless transmitter 5, A wireless signal (wireless signal of any channel) can be transmitted, and the data of the wireless signal received by each wireless receiver 4 is transmitted to the data receiver 8!1 via the data transmitting means 20. However, in such a conventional example, the wireless receivers 4 of the plurality of data transmitters 8!2 receive the wireless signal, and the same data is transmitted separately by the plurality of data transmitters 2. , the control may be performed as if the operation switch SW of the wireless transmitter 5 had been turned on multiple times, and the lighting load may be increased.
, L2, etc. may be erroneously controlled. For example, when the channel of the wireless transmitter 5 is set to a predetermined channel and the operation switch SW is turned on once to reversely control the lighting load L1, the wireless number 44 transmits two data transmission
When received by the wireless receiver 4 of 8!2, data for inverting the lighting load L1 is sent from the data transmission fi2 of @1, and then the lighting load L1 is sent from the second data transmitter 2 again. Furthermore, there is a problem in that data for inversion control is transmitted, and as a result, the lighting load is not inverted and returned to the original control state, resulting in erroneous control.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and its object is to transmit a plurality of data using one wireless transmitter [via one wireless receiver]. An object of the present invention is to provide a data transmission system that can perform data transmission and prevent inconveniences caused by the same data being transmitted multiple times when a mechanical switch is fabricated once.

[Disclosure of the Invention 1 (Embodiment) Fig. 1 shows an embodiment of the present invention, in which a plurality of data receivers 1 each having a unique address set, and a wireless receiver 8
! 4 on the same transmission line 1
The wireless receiver 4 receives a wireless signal repeatedly transmitted from the wireless transmitter 5 when the operation switch sw is turned on, and the data transmitted by the wireless signal is transmitted from the data transmitter 2 only once. a data transmitter y, 20 transmitting via line 3 to a predetermined data receiver 1;
Collision prevention prevents simultaneous transmission by checking whether a data transmission signal is being transmitted from another data transmitter 2 and, if it is, suspending transmission of its own data transmission signal for a predetermined darkness. In a data transmission system similar to the conventional example shown in FIG.
Address data AD of data receiver 1 set in a
The wireless transmitter 5 is configured to repeatedly transmit a wireless signal for transmitting transmission data CD consisting of load reversal control data and load reversal control data, and the transmission start time is determined according to the reception level of the wireless signal received by the wireless reception Wi 4. The transmission start control means 22 to control and the data to be transmitted to another data transmission W while the data to be transmitted is waiting for transmission.
The data transmission 1fi2 includes a transmission canceling means 23 that cancels the transmission of the data when the data is transmitted from i2.
It was established in

The operation of the embodiment will be explained below using the flowchart shown in PttJ2 diagram. Kei, each data transmission M8!2
Wireless reception 8!4 can be used with any wireless transmitter 5.
It also receives wireless signals from
A so-called unique channel is not set in the wireless receiving M8!4 uplink wireless transmitter 5. Therefore, the data transmitting means 2 checks whether a wireless signal from any of the wireless transmitters 5 is received, and when a wireless signal is detected, the data transmitting means 20 transmits data using that wireless signal. address data AD (in the illustrated example, the unique address "001" of the data receiver 2 connected to the lighting load is set) and transmission data CD (inverted control data for the lighting load). It transmits data using a data transmission signal, accesses a predetermined data reception 8!1, sends the transmission data CD to data receiver M 1, and inverts the lighting load, L2, etc. ing.

In this case, the transmission timing of the data transmission signal is controlled by the collision prevention means 21, and the transmission timing of the data transmission signal is controlled by the collision prevention means 21.
/Ii2 is struck after confirming that no data transmission signal is being transmitted, and if a data transmission signal is being transmitted from another data transmitter 2, the transmission of data transmission No. 46 is suspended and the system is in standby mode. The message will be sent again after a predetermined period of time.

Here, the operation for preventing duplicate data transmission in which the same data is transmitted from a plurality of data transmitters 2 when the operation switch SW is operated once is as follows. That is, when a wireless signal is received by the wireless receiver 4, the transmission start control means 22 immediately detects the reception level and sets it as m, determines whether m is above a certain level, and determines whether m is above a certain level. For example, the received data is transmitted as a data transmission signal. On the other hand, if m is below a certain level, 1 is added to 1 and the data transmitting means 20 is controlled to suspend transmission for a certain period of time (time required for data transmission). In this case, the data transmission timing is set earlier (the higher the fi level is, the faster the data transmission timing is set), and the wireless reception of the data transmitter 2 of
If the same wireless signal is being received at the same time, the data transmission timing will be set in descending order of reception level. Note that if the reception level is low overall, the data transmission signal will not be transmitted at the first data transmission timing. Further, if the reception levels of the wireless receivers 4 of the plurality of data transmitters 2 are substantially constant, there is a possibility that interference may occur due to simultaneous transmission, but it is obvious that this can be avoided by the collision prevention means 21.

On the other hand, during this transmission standby, the transmission canceling means 23 checks whether the data it is about to transmit will be transmitted from another data transmitter 2, and if it is transmitted, cancels the transmission of the data. to prevent duplicate data transmission. For example, when wireless signals transmitted from the wireless transmitter 5 are received by the wireless receivers 2 of both data transmitting islands 2, first, the illumination signal is transmitted from one of the data transmitters 2 having a higher reception level. A data transmission signal for inverting the load is transmitted, and the other data transmitter 2, which has a lower reception level, enters a standby state.

At this time, the other data transmission 8!2 checks whether the data received by the wireless reception 8!4 matches the data being transmitted from the other data transmitter 2, and if they match, Since the received data is canceled and data transmission is not performed to avoid duplicate data transmission, the original control is canceled because the lighting load L1 is reversed twice as in the conventional example. This prevents the situation from returning to the same state, and prevents the inconvenience caused by the same data being transmitted multiple times by a plurality of data transmitters 2 when the operation switch SW is operated once.

[Effects of the Invention] As described above, the present invention connects a plurality of data receivers to which unique addresses are set and a plurality of data transmitters equipped with wireless receivers to the same transmission line, and The wireless receiver 4FtR receives the repeated wireless signal sent from the wireless transmitter when the wireless signal is turned on, and the data sent by the wireless signal is sent only once from the data transmitter to a predetermined data receiver via the transmission line. Simultaneous transmission is possible by checking the data transmission means to be transmitted and whether data transmission signals emitted from other data transmitters are being transmitted, and if they are being transmitted, suspending transmission of its own data transmission signal. In a data transmission system in which a data transmitter is provided with collision prevention means for preventing collisions, the wireless transmitter is configured to repeatedly transmit address data of the data receiver and a wireless signal that transmits the transmitted data, transmission start control means for controlling the transmission start time according to the strength of the wireless signal received by the transmitter; and when the data to be transmitted is transmitted from another data transmitter while the own data transmitter is waiting for transmission. and a transmission canceling means for canceling the transmission of the data in the data transmission M8! Since one wireless transmitter can transmit data via the wireless receivers of multiple data transmitters, the same data can be transmitted multiple times when the operation switch is operated once. This has the effect of preventing inconveniences caused by transmission.

[Brief explanation of drawings]

tjS1 Figure (a) is a schematic configuration diagram of one embodiment of the present invention, the first
Figure (b) is the main block circuit diagram of the same as above, Figure 2 is a flowchart showing the operation of the same as the above, Figure 3 is a schematic configuration diagram of the conventional example, Figure 4 is an explanatory diagram of the same as the above, and Figure 5 is another example. FIG. 2 is an explanatory diagram of the operation of a conventional example. 1 is a data receiver, 2 is a data transmitter, 3 is a transmission line, 4
5 is a wireless receiver, 5 is a wireless transmitter, 20 is a data transmitting means, 21 is a collision prevention means, 22 is a transmission start control means, and 23 is a transmission canceling means. Agent Patent Attorney Ishi 1) Ai Figure 7 2

Claims (1)

[Claims] (1) Multiple data receivers with unique addresses set and multiple data transmitters equipped with wireless receivers are connected to the same transmission line, and the wireless transmitter repeatedly transmits data when the operation switch is turned on. data transmitting means for receiving a wireless signal with a wireless receiver and transmitting the data sent by the wireless signal from the data transmitter to a predetermined data receiver via a transmission line only once; and another data transmitter. The data transmitter is provided with a collision prevention means that prevents simultaneous transmission by checking whether a data transmission signal is being transmitted from the data transmitter and, if it is, suspending transmission of its own data transmission signal for a predetermined period of time. In a data transmission system consisting of a data transmission system, a wireless transmitter is configured to repeatedly transmit a wireless signal that transmits address data of the data receiver and transmission data, and a wireless transmitter is configured to repeatedly transmit a wireless signal that transmits address data and transmission data of the data receiver, and A transmission start control means for controlling a transmission start time, a transmission canceling means for canceling transmission of data when the data to be transmitted is transmitted from another data transmitter while the own data transmitter is waiting for transmission, and a data transmitter. A data transmission system characterized by: