JP2809472B2 - Home bus connection optical space transmission network - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical space transmission network connected to a home lot via an interface unit.

[Conventional technology]

When information is transmitted by optical space transmission, especially in one-to-N communication, it is difficult to expand the network area due to restrictions on the spatial perspective of the transmitting side and the receiving side. Of course, if a repeater is provided, this problem can be solved.However, installing a dedicated repeater will increase the cost. Since a malfunction occurs due to sneaking into a circuit, another problem such as restriction of an installation place for preventing the malfunction or necessity of a structure is required.

FIG. 10 shows an optical space transmission apparatus having a relay function without using a dedicated repeater.
1 shows an optical space transmission network described in Japanese Patent Publication No. 43-43.

In FIG. 10, reference numeral 1 denotes an optical space transmission device having a transmitter T and a receiver R, which is connected to a host computer HC, a network node, and the like. Optical space transmission equipment 1a ~
1c has a transmitter T, a receiver R and a data terminal 2 such as a personal computer as shown in FIG. 11, the receiver R having an optical / electrical converter 3 and a demodulator 4, The machine T has a modulator 5 and an electric / optical converter 6,
The data terminal 2 has a switch 7 constituting a loop-back circuit, a control address discriminator 8, and a memory 9 for storing demodulated data. The space optical transmission device 1d includes a transmitter T and a receiver R.

Upon receiving the optical signal, each of the optical free space transmission devices 1a to 1c performs optical / electrical conversion on the optical signal and inputs the optical signal to the demodulator 4. In demodulator 4,
The clock is extracted and demodulated, and the demodulated data is written to the memory 9 by the extracted clock. At the time of transmission, transmission data obtained by adding the transmission destination address and the transmission source address to the data to be transmitted enters the modulator 5 through the switch 7, where it is modulated, and the modulated output is subjected to electro / optical conversion. Radiated as The address discriminator 8 checks the destination address included in the output of the demodulator 4 and
If the address is not addressed to itself, the switch 7 constituting the loop-back circuit is connected to the modulator 5 and the demodulator 4
Is output to the modulator 5, which is sent to the space through the electro-optical converter 6.

In this configuration, a unique address is assigned to the optical free space transmission devices 1, 1a to 1c, 1d. When transmitting to the free-space optical transmission apparatus 1, the free-space optical transmission apparatus 1a transmits data from the transmitter T with its own and destination addresses (in this case, the address of the free-space optical transmission apparatus 1). Optical space transmission device 1b
Receives the optical signal, but since the destination is not addressed to itself, the return data is used as it is by the return function (without changing the data, destination address, and source address), and the optical space transmission apparatus 1 is transmitted by the transmitter T. Transfer to Since the optical space transmission apparatus 1 receives a signal for itself,
The return mode is canceled and the received data is sent to the host computer HC.

[Problems to be solved by the invention]

The space optical transmission devices 1a to 1c in this network have a function of relaying a received signal when the transmission destination address is not the address assigned to the transmission destination address. Since it is indistinguishable whether the signal is directly received from the transmission source or relayed by another optical space transmission device, as shown in FIG. When only the optical signal is transmitted by designating the spatial transmission device 1c, repeated relay occurs between the optical spatial transmission devices 1a and 1b which are not the transmission destinations (,,
... indicates the number of relay operations), and the relay operation may be continued.

Further, when this type of optical space transmission device 1a-c is connected to a home bus (not shown) to control or monitor household equipment such as lighting, signals from the optical space transmission device 1a-c are required. Has a problem of affecting the home bus.

The present invention has been made to solve the above problems,
Communication within the optical space transmission network can be performed without affecting the home bus, and a practically superior home bus connection optical space transmission network that connects to the home bus without worrying about the signal arrival route. The purpose is to provide.

[Means for solving the problem]

In order to achieve the above object, the present invention comprises a plurality of control terminals for transmitting and receiving optical signals, a remote controller for transmitting optical signals, and an interface unit for transmitting and receiving optical signals, wherein the interface unit is connected to a home bus. A transmission network, wherein the optical signal has a bucket type, a source address, a destination address, and control data, and the interface unit specifies the received signal when relaying between the home bus and the spatial optical transmission network. Has the function of relaying by converting the signal format according to the bucket type and relaying the relay signal by placing relay information on the signal from the remote controller.If the control signal is addressed to the terminal itself, Decodes the above control data and sends a control signal to the controlling device If the received signal is addressed to another terminal, a relay operation of transmitting the received signal with the relay information carried out is performed, and among the control terminals receiving the signal having the relay information, those whose received signals are not addressed to themselves perform the output operation. The configuration is not performed.

In the second aspect, when the interface unit receives a non-relay signal among the received signals whose packet type specifies the home bus, the interface unit sets a dead band after the reception, and the control terminal receives the received signal destined for the terminal itself. If the signal is a non-relay signal, a dead zone is set after reception, and the relay information is a flag set in the data format of the signal.

[Action]

In the present invention, when the packet type of the format of the signal generated in the optical space transmission network specifies "home bus", the interface unit relays the packet on the home bus. When "Network" is specified, the signal is relayed to the control terminal in the local network, so signals from the remote controller to the control terminal may affect other networks connected to the home bus BUS. There is no.

In addition, the interface unit and the control terminal have a function of relaying a signal, and at the time of this relay, the relay terminal carries the relay information and transmits the signal, and when a flag is set in the received signal, the own terminal is in a non-relay stage. If it is determined that the received signal is not addressed to the own terminal, the received data is discarded, so that the repeating operation of the relay does not occur.

Also, if the received signal is a non-relay signal addressed to itself, each control terminal sets a dead zone after receiving and relays the receiving operation, so it operates only with the first signal and malfunctions the dominant device. There is no danger to make it happen.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, an HCT is a home controller, which sends a control signal for a control device of a control terminal constituting an optical space transmission network, which will be described later, onto the home bus BUS, and transmits a control signal from the optical space transmission network to the home bus BUS.
And decodes the signal transmitted through the device to activate a corresponding indicator lamp, alarm device or the like.

Reference numeral 10 denotes an interface unit connected to the home bus BUS, which includes a transmission unit T, a reception unit R, and a control unit C, and has a block configuration shown in FIG. 20A, 2
Control terminals 0B and 20C are arranged in multiple stages and have a block configuration as shown in FIG. Reference numeral 30 denotes a remote controller, and its block configuration is shown in FIG.

In FIG. 2, the receiving unit R has an optical / electrical converter 11 for converting an optical signal into an electric signal, and a demodulator 12 for demodulating the received signal converted into an electric signal by the optical / electrical converter 11. , And sends the demodulated data to the control unit C. The control unit C has a reception data memory 13, an address decoder 14, a controller 145, a transmission circuit 16, and a bus control circuit BUSCONT for temporarily storing the demodulated data. The transmitting unit T includes a modulator 17,
The transmission circuit 16 is activated by a command from the address decoder 14, reads out data stored in the reception data memory 13, sets a flag, and assembles a transmission data format 40. The modulator 18 modulates the signal having the transmission data format 40 to convert the signal into an electric / optical converter.
Enter in 18. Reference numeral 19 denotes an input circuit, which monitors the state of the device controlled by the controller 15, activates the transmission circuit 16 and sends a state signal to the bus control circuit BUSCONT.

The controller 15 reads a control code out of the data stored in the reception data memory 13 in response to a command (notification) from the address decoder 14, decodes the control code, and sends out a control signal to the controlling device.

In FIG. 3, a receiving unit R for receiving an optical signal includes an optical / electrical converter 21 for converting the optical signal into an electric signal, and a demodulation for demodulating the received signal converted into an electric signal by the optical / electrical converter 21. vessel
And sends the demodulated data to the control unit C. Control unit C
Has a reception data memory 23, an address decoder 24, a controller 25A, a transmission circuit 26, and an input circuit 29 for temporarily storing the demodulated data.
Interface unit 1 with no SCONT
This is different from the control unit C of 0. The transmission unit T includes a modulator 27,
The transmission circuit 26 is activated by a command from the address decoder 24, reads out all data stored from the reception data memory 23, sets a flag, and assembles a transmission data format 40. The modulator 27 modulates the signal having the transmission data format 40 to convert the signal into an electrical / optical converter 28.
To enter.

The controller 25 reads a control code out of the data stored in the reception data memory 23 in response to a command (notification) from the address decoder 24, decodes the control code, and sends out a control signal to the control device.

When the address decoder 24 determines that the received data is addressed to itself and is a non-relay signal, the control terminals 20A to 20C set a dead zone at time T2 after reception. The dead zone T2 is such that the time required for the remote controller 10 and the control terminals 20A to 20C to transmit and receive signals is T1, and the processing time delay is TL.
Is given by T2 (T1 + TL) (1)

In FIG. 4, 31 is a key switch, 32 is an input circuit,
33 is a transmission circuit, 35 is a modulator, and 36 is an electro / optical converter.

FIG. 5 exemplifies a data format 40 of a signal in an optical free space transmission network (local network). A reader unit 41 for identifying the start of a signal, and a custom code 4 which is a fixed value for identifying a system.
2, a packet type 43 for identifying transmission to the home bus BUS or communication within the local network,
A reception address code 45 for specifying the destination terminal, a transmission address code 44 for specifying the destination terminal, a relay flag 46, a control code for instructing the control terminal to operate (using the EIAJ standard in the home bus data code) 47, It comprises a redundant code 48 for detecting a code error and a trailer 49 indicating the end of the packet.

Hereinafter, the operation of this device will be described with reference to the signal time chart of FIG.

For convenience of explanation, it is assumed that the control objects controlled by the control unit C of the control terminals 20A, 20B, and 20C are a first illumination light, a second illumination light, and a third illumination light, respectively. (A) FIG. As shown, it is assumed that a control signal for turning on (ON) the first illumination lamp is transmitted from the home controller HTC onto the home bus BUS.

The bus control circuit BUSCONT converts the data format of the control signal for the home bus into the format for the local network shown in FIG. That is, the packet type
43 is "Local", and the reception address code 45 is the control terminal 20
The code of A and the transmission address code 44 are used as its own address code, the relay flag 46 is set to “0”, and a signal having this data format is transmitted to the transmission circuit 16. Transmitter T emits the room space as an optical signal L ₁ modulates the signal.

Signal L ₁ emitted into the room space, the control terminal 20B
In is received, the control terminal 20B, and converted into an electric signal the optical signal L ₁ received by the optical / electrical converter 21, stores the received data after demodulated by the demodulator 22 to the reception data memory 23. When the reception data is stored in the reception data memory 23, the address decoder 24 reads the destination address and the flag from the reception data stored in the reception data memory 23, and determines whether the reception data is addressed to the own terminal from the transmission destination address. It is determined whether it is addressed to the terminal, and it is determined whether the flag is set (whether or not it has relay information). If the received data is addressed to the own terminal, the controller 25 is notified of that fact.
In this case, since there is no relay information addressed to the other terminal (the control terminal 20A), the transmission circuit 26 is instructed to relay the received data. Upon receiving this command, the transmission circuit 26 reads the data (destination address, control code) stored in the reception data memory 23 and sends it to the modulator 27 in a transmission data format with a flag (value "1") set. . Transmission signal modulated by the modulator 27 is conductive / a light converter 28 is converted into the optical signal L ₂ is radiated into space.

The optical signal L ₁ is received even control terminal 20A. This optical signal L ₁ is designated a control terminal 20A as a receiving address, the address decoder 24 of the control terminal 20A determines that the received data is addressed to its own terminal, the storage control unit 27 in the reception data memory 23 The control code in the received data is read out, decoded, and an ON command is given to the first illumination lamp.

Control terminal 20A receives the above optical signal L ₁ and L _2, but the same control data will be received twice, when receiving from the interface unit 10 performs the operation because the flag is not set Select dead zone T2. Control terminal
Since the optical signal L ₂ from 20B receives during this dead zone T2, ignore this signal, avoiding an erroneous operation.

(B) Next, from the remote controller 30 to the control terminal 20A
Will be described with reference to FIG.

When a key for designating the operation of the control terminal 20A and its controlling device is pressed, the remote controller 30 sends a "local" packet type 43 and a reception address code 45 to the code of the control terminal 20A in the data format 40 of FIG. ,
The transmission address code 44 is used as its own address code, and the relay flag 46 modulates a signal having a data format of “0” with the modulator 54, converts the signal into an optical signal L ₃ with the optical / optical converter 55, and transmits the signal. I do.

When receiving the optical signal L ₃ , the interface unit 10 converts the received optical signal L ₃ into an electric signal with the optical / electrical converter 11, demodulates the demodulated signal with the demodulator 12, and stores the received data in the received data memory 13. . Received data is received data memory
When the data is stored in the address decoder 13, the address decoder 14 reads the destination address and the flag from the received data stored in the received data memory 13, and determines whether the received data is addressed to the own terminal or another terminal from the destination address. It is determined, and whether or not the flag is set (whether or not it has relay information) is determined. If the received data is addressed to the terminal,
15 to that effect, but in this case, the other terminal (control terminal
10A), and has no relay information.
Instructs that the received data should be relayed. Upon receiving this command, the transmission circuit 16 reads out the data (destination address, control code) stored in the reception data memory 13 and
The signal is transmitted to the modulator 17 in a transmission data format in which a flag is set (value “1”). Modulated transmission signal by the modulator 17 is conductive / a light converter 18 is converted into the optical signal L ₄ is radiated into space.

Since the optical signals L ₃ of the control terminal 20B also received is not a self-addressed, again sends a flag (this optical signal and L ₅₎
I do.

The control terminal 20A is the optical signal L ₃ designates a control terminal 20A as a receiving address, the address decoder 2
4 determines that the received data is addressed to its own terminal,
Reads a control code out of the received data stored in the received data memory 23, decodes the control code, and gives an ON command to the first illumination lamp.

Also in this case, the control terminal 20A is connected to the remote controller 30.
Addition to directly receive optical signals L ₃ from the interface unit 10, the optical signal L ₄ relayed respectively control terminal 20B, L
₅ , the relayed signal is received during the dead zone T2 set by the control terminal 20A, so that no malfunction occurs.

In the above (A) and (B), in the control terminal 20C, since the destination address of the received signal is not addressed to the own terminal and the flag is set, the own terminal does not perform the relay operation. Is determined, the address decoder 24 does not issue a command to any of the controller 25 and the transmission circuit 26, and erases the contents of the reception address memory 23.
(C) Next, the case where the control terminal 20A transmits a signal on the home bus BUS will be described with reference to FIG.

When the control terminal 20A transmits the state of the first lighting lamp, which is the dominant device, to the home controller HC via the home bus BUS, the transmission circuit 26 is activated by the input circuit 29 that has, for example, periodically acquired the state of the dominant device. Therefore, in the data format 40 shown in FIG.
S ", self-code transmission address, a reception address and the code of the home controller HCT, a control code 45 and transmits the converted signal format is set to" status code "in the optical signal L _6. Since the interface unit 10 receiving this signal L ₆ has the bucket type “HBS”,
The format is sent to the bus control circuit BUSCONT, and the bus control circuit BUSCONT converts the above format into a format for the home bus and sends it out to the home bus BUS. The signal transmitted on the home bus BUS is received by the home controller HCT, and the home controller HCT decodes the signal because the signal is addressed to its own station, and responds to the state of the dominant device of the control terminal 20A. Display on the display.

The signal L ₆ are also received the control terminal 20B, since it is not addressed to its own terminal, again transmitted (the optical signal a flag is L ₇
To).

Therefore, the interface unit 20 is connected to the control terminal 20.
A signal L ₆ is received from A, and a signal L ₇ is received from the control terminal 20B.
Signal L ₇ relayed since received during the dead zone T2 which is set by the reception of the signals L _6, which is ignored.

As described above, in the present embodiment, when the packet type of the format of the signal generated in the local network is “HBS”, the interface unit 10 relays the packet on the home bus BUS, but the packet type is “local”. In the case of, since the signal is relayed to the control terminal in the local network, a signal or the like from the remote controller 30 to the control terminal 20A to 20C may affect other local networks connected to the home bus BUS. There is no.

Also, the interface unit 10, the control terminals 20A to 2
0C has the function of relaying the signal.
Transmit the relay information, if the received signal is flagged, determine that the terminal itself is a non-relay stage, if the received signal is not addressed to its own terminal, discard the received data,
No repeat operation of the relay occurs.

Further, when the received signals are addressed to the own terminal and the flag is not set, each of the control terminals 20A to 20D sets the dead zone T2 and interrupts the receiving operation after receiving. It operates only and there is no danger of malfunctioning the dominant device.

〔The invention's effect〕

As described above, according to the present invention, the interface unit connected to the home bus has a gateway function,
Since the signals from the home bus to the local network and from the local network to the home bus are converted and relayed, communication between the local networks can be performed without affecting the home bus. In the network, the interface unit and the control terminal are configured to add the relay information at the time of relaying and transmit the relay signal, and to perform the output operation when the received signal has the relay information and is not addressed to the own terminal. By doing so, the relay is not repeated, and there is no malfunction due to the above-mentioned wraparound of the optical signal, so there are few restrictions due to price and space perspective, and the optical spatial transmission network can be connected without worrying about the arrival route of the signal. It can be connected to a bus, and the number of control terminals can be easily increased or decreased. Kill.

[Brief description of the drawings]

FIG. 1 is a network showing an embodiment of the present invention, FIG. 2 is a block diagram showing a specific configuration of an interface unit in the above embodiment, and FIG. 3 is a block diagram showing a specific configuration of a control terminal in the above embodiment. FIG. 4 is a block diagram of a remote controller in the above embodiment,
FIG. 5 shows a transmission data format in the above embodiment,
FIG. 6 is a signal time chart for explaining the relay operation in the above embodiment, FIGS. 7 to 9 are signal path diagrams for explaining the operation of the above embodiment, and FIG. FIG. 11 is a diagram showing an optical space transmission network, FIG. 11 is a block diagram showing an internal configuration of an optical transmission device in the above-mentioned conventional example, and FIG. 12 is a network diagram for explaining problems of the above-mentioned conventional example. 10 ... Interface unit, 20A ~ 20C ... Control terminal, 11, 21 ... Opto / electric converter, 12, 22 ... Demodulator, 13, 23 ...
… Reception data memory, 14, 24 …… Address decoder, 1
5, 25 ... controller, 16, 26 ... transmission circuit, 17, 27 ... modulator, 18, 28 ... electro-optical converter, 19, 29 ... input circuit,
BUS: Home bus, BUSCONT: Bus control circuit, HC ...
Home controller, C: control unit, R: receiving unit, T: transmitting unit,

Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI H04Q 9/00301 (56) References JP-A-3-136429 (JP, A) JP-A-2-60252 (JP, A) JP-A 2-828 (JP, A) JP-A-1-174134 (JP, A) JP-A-63-153935 (JP, A) JP-A-62-254544 (JP, A) JP-A-62-172834 (JP, A A) JP-A-60-177754 (JP, A) JP-A-58-17736 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04L 12/28, 12/40 H04L 12 / 46 H04B 7 / 26,10 / 10 JICST file (JOIS) WPI (DIALOG) INSPEC (DIALOG)

Claims (3)

(57) [Claims] An optical spatial transmission network comprising a plurality of control terminals for transmitting and receiving optical signals, a remote controller for transmitting optical signals, and an interface unit for transmitting and receiving optical signals, wherein the interface unit is connected to a home bus. The optical signal has a format including a packet type, a destination address, a destination address, and control data, and the interface unit specifies the received signal when relaying between the home bus and the optical space transmission network. It has a function of relaying by performing conversion of the signal format according to the packet type and relaying the relay terminal with the relay information for the signal destined for the control terminal from the remote controller, and the control terminal receives a signal destined for itself. In the case, decrypt the above control data and control to the controlling device If the received signal is addressed to another terminal, a relay operation of sending the received signal with relay information carried thereon is performed, and among the control terminals receiving the signal having the relay information, the received signal is not addressed to itself. A home bus connection optical space transmission network, characterized in that it does not perform an output operation. 2. The interface unit sets a dead zone after receiving a non-relay signal among received signals whose packet type specifies a home bus. 3. The home bus-connected optical space transmission network according to claim 1, wherein a dead zone is set after reception if the signal is a non-relay signal. 3. The home bus-connected optical space transmission network according to claim 1, wherein the relay information is a flag set in a data format of the signal.