JPH03274837A - Optical spatial transmission network for multiple stage/ bidirectional communication in home bus connection - Google Patents

Abstract

PURPOSE:To perform communication between local networks without affecting on a signal on a home bus by attaching a gateway function on an interface unit connected to the home bus, and interrupting the signals from the home bus to the local network and from the local network to the home bus by converting their formats. CONSTITUTION:The packet classification of the signal transmitted from a remote controller 30 is set at (HBS), and transmission is performed by designating a home controller HCT and a control terminal in another local network, and attaching a control code. The interface unit 10 interrupts the signal on the home bus BUS when the packet classification of the format of the signal generated in the local network shows (HBS), however, it interrupts the signal to the control terminal in the local network when it shows (local). Therefore, it is possible to prevent the signal from the remote controller 30 to the control terminals 20A-20C, etc., affecting on another local network connected to the home bus BUS.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multistage bidirectional optical space transmission network connected to a home bus via an interface unit.

[Conventional technology]

When transmitting information by optical space transmission, especially 1:N
In communications, it is difficult to expand the network area due to spatial line-of-sight constraints between the sending and receiving sides.Of course, this problem can be solved by installing repeaters, but installing dedicated repeaters is costly. In addition, when there are multiple repeaters, it is difficult to take countermeasures against interference, and malfunctions occur due to interference from the transmitting circuit to the receiving circuit.To prevent this, there are restrictions on the installation location, and it is necessary to devise a structure. Another problem arises, such as requiring .

FIG. 10 shows an example in which an optical space transmission device is provided with a relay function without using a dedicated repeater.
This figure shows the optical space transmission network described in Publication No. 2143.

In FIG. 10, 1 is an optical space transmission device having a transmitter T and a receiver R, and is connected to a host computer HC, a network node, etc. Optical space transmission device 1
A to 1c have a transmitter T, a receiver R, and a data terminal 2 such as a personal computer, as shown in FIG.
The receiver R has an optical/electrical converter 3 and a demodulator 4;
Further, the transmitter T has a modulator 5 and an electrical/optical converter 6, and the data terminal 2 has a switch 7 forming a return circuit, an address discriminator 8 for controlling the switch 7, and a memory 9 for storing demodulated data. are doing. The optical space transmission device 1d is a transmitter T
and receiver R.

When each of the optical space transmission devices 1a to 1c receives an optical signal, it performs optical/electrical conversion and inputs the optical signal to the demodulator 4.

The demodulator 4 performs clock extraction and demodulation, and demodulated data is written into the memory 9 using the extracted clock. During transmission, the transmission data, which is the data to be transmitted plus the destination address and the source address, enters the modulator 5 through the switch 7, where it is modulated, and the modulated output is converted into an optical signal. radiated as. The address discriminator 6 checks the destination address included in the output of the demodulator 4, and if the address is not addressed to itself, connects the switch 7 forming the return circuit to the modulator 5, and outputs the output of the demodulator 4. is applied to a modulator 5, which is transmitted into space through an electro/optical converter 6.

In this configuration, optical space transmission devices 1.1a to 1c, 1.
A unique address is assigned to d.

When the optical space transmission device 1jla transmits data to the optical space transmission device 5, the data is sent from the transmitter T with self and destination addresses (in this case, the address of the optical space transmission device 5) attached. The optical space transmission device 1b receives this optical signal, but since the destination is not addressed to itself, the transmitter T uses the loopback function to send the received data as is (without changing the address, destination address, or source address). Transfer to optical space transmission device l. Since the received signal is addressed to itself, the optical space transmission device 1 cancels the return mode and sends the received data to the host computer HC.

[Problem to be solved by the invention]

The optical space transmission devices 1a to IC in this network have a function of relaying the received signal when the destination address is not the address assigned to itself, so the above problem is solved, but the received signal Since it is not possible to distinguish whether a signal is received directly from a transmission source or is relayed by another optical space transmission device, the optical space transmission device 1 is transmitted to the optical space as shown in FIG. When transmitting an optical signal by specifying the transmission device 1c, repeated relaying will occur between the optical space transmission devices 1a and 1b, which are not the destination.
(2, 2, etc. indicate the number of relay operations), there is a possibility that the relay operation will be continued.

Furthermore, when trying to control and monitor equipment such as lighting lights by connecting these types of space optical transmission devices 1a to 1c to a home bus (not shown), the space optical transmission devices 1a to 1c
The problem arises that the signal from C affects the home bus.

The present invention has been made to solve the above problems, and it is possible to perform communication within an optical space transmission network without affecting the home bus, and to connect the home bus without worrying about the route of signals. The purpose of the present invention is to provide an optical space transmission network for multi-stage, two-way communication with a practically excellent home bus connection.

[Means to solve the problem]

In order to achieve the above object, the present invention comprises a plurality of control terminals that transmit and receive optical signals, a remote controller that transmits and receives optical signals, and an interface unit that transmits and receives optical signals, and an optical space in which the interface unit is connected to a home bus. In the transmission network, the optical signal has a format including a packet type, a return destination address, a reception destination address, and transmission contents, and is transmitted from the transmission source to the transmission destination or reception destination by specifying the number of signal relay stages. , the interface unit has a function of updating and relaying the number of signal relay stages of the received signal, and setting a dead time in consideration of the number of signal relay stages, and this relay operation is a relay between the home bus and the network. In this case, the signal format is converted and relayed according to the packet type specified by the received signal, and the control terminal monitors the status of the control device and transmits data on the status when the status changes or periodically to the source address. and the report destination address, specifying the number of signal relay stages to the report destination address, and transmitting the signal, and if the received signal is addressed to its own terminal, the control terminal decodes the control data and sends it to the control device. A control signal is sent to the sender, a dead time is set in consideration of the number of signal relay steps, and a confirmation signal specifying the number of signal relay steps to the sender is sent back to the sender.If the signal is addressed to another terminal, the above reception is performed. Among the control terminals that perform a relay operation to update the signal relay stage number and send the signal, and receive a signal in which the signal relay stage number of the received signal has been updated to a predetermined value, the control terminal whose received signal is not addressed to its own terminal outputs the signal. This is a configuration in which no operation is performed.

In claim 2, the remote controller, after sending the signal,
The transmitting operation is suspended during a predetermined return waiting time, and when a confirmation signal is received before the elapse of the return waiting time, the transmitting operation is enabled. and has a function of performing a display corresponding to the received confirmation signal or status signal, and according to claim 4, the updating of the number of signal relay stages is to decrease the number of stages by -1, and the predetermined value is the number of stages 0. I did it like that.

[Effect]

In the present invention, if the packet type of the format of the signal generated in the local network is rHBS, the interface unit relays it on the home bus, but if it is "local", it is controlled by the local hotwork. Relay to terminal.

Additionally, the "status" of devices controlled by each control terminal is reliably communicated to designated devices such as home controllers and remote controllers.

In addition, the optical signal is transmitted by specifying the number of relay stages and address to the destination terminal at the transmission source, and the control terminal specifies the transmission source as the destination and sends out a device status signal, and the interface unit, The control terminal performs a relay operation if the number of signal relay stages of the received signal is not a predetermined value, and does not perform a relay operation if it is a predetermined value and the address is not its own address. Therefore, the above-mentioned repeated relay is not possible. Definitely prevented.

〔Example〕

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

In FIG. 1, the HCT is a home controller that sends control signals to the control devices of the control terminals constituting the optical space transmission network (described later) onto the home bus BUS in a predetermined signal format, and It decodes a signal sent onto the home bus BUS from a local network (hereinafter referred to as a local network) and operates a corresponding display lamp of a display device (not shown). Other operations of the home controller HCT will be explained in the explanation of the operation of this embodiment.

Reference numeral 10 denotes an interface unit connected to the home bus BtJS, which is assigned an address code, includes a transmitter T, a receiver R, and a controller C, and has block authority as shown in FIG. Reference numerals 20A, 20B and 20C are control terminals arranged in multiple stages, each having a unique address code assigned thereto, and having a configuration as shown in FIG. 30 is a remote controller having block authority shown in FIG.

In FIG. 2, a receiving unit R that receives an optical signal includes an optical/electrical converter 11 that converts the optical signal into an electrical signal, and a demodulator that demodulates the received signal converted into an electrical signal by the optical/electrical converter 11. The demodulated data is sent to the control unit C. The control unit C includes a reception data memory 13 for storing the demodulated data, an address decoder 14, and a controller 15.
, a transmission circuit 16, a bus control circuit BUSCONT, and an input circuit 19. The transmitter T has a modulator 17 and an electro/optical converter 18, and the transmitter circuit 16 is activated by a command from the address decoder 14, reads out all data stored in the received data memory 13, and relays the signal. In addition to updating the stage number (stage number code) N (-1fiIi calculation count) and assembling the data format 40 (FIG. 5(a)), the data format 50 is activated by a command from the input circuit 19 and transmits a status signal to be described later. (Figure 5 (
b)). The modulator 17 modulates the signal having the above transmission data format 40 and outputs the modulated signal to the electrical/optical converter 18 .

The controller 15 receives commands (notifications) from the address decoder 14.
reads the control code from the data stored in the received data memory 13, decodes it and sends a control signal to the controlling device, and when the set time T2 has elapsed, gives a command to the transmitting circuit 16. The transmitting circuit 16 is activated and a confirmation signal is sent in the data format 60 shown in FIG. 5(C).

The input circuit 19 is the state of the controlled object controlled by the interface unit 10! (For example, whether it is in the ON state,
OFF state, etc.), and inputs a status signal to the transmitting circuit 16 along with a command when the status changes or periodically. The transmitting circuit 16 that has received this command and status signal transmits the signal having the format 50 to the bus control circuit BUSCO.
Give to NT. Note that the operation of the bus control circuit BUSCONT will be described later.

In FIG. 3, the receiving section R includes an optical/electrical converter 21 that converts an optical signal into an electrical signal, and a demodulator 22 that demodulates the received signal converted into an electrical signal by the optical/electrical converter 21. , sends the demodulated data to the control unit C. The control unit C causes a reception data memory 23 to store the demodulated data.
, an address decoder 24, a controller 25, a transmitting circuit 26, and an input circuit 29. The transmitter T includes a modulator 2
7 and an electrical/optical converter 28, the transmitting circuit 26 is activated by a command from the address decoder 24, reads out all data stored from the received data memory 23,
In addition to updating the stage number code N (-1m count) and assembling the transmission data format 30, it is activated by a command from the input circuit 29 and sends out a status signal to be described later in the data format 50. The modulator 27 modulates the signal having the above data format 40.50 and inputs the modulated signal to the electrical/optical converter 28.

The controller 25 receives commands (notifications) from the address decoder 24.
reads the control code from the data stored in the received data memory 23, decodes it and sends a control signal to the controlling device, and when the set time T2 has elapsed, gives a command to the transmitting circuit 26. The transmitting circuit 26 is activated to return a confirmation signal in the format 60 shown in FIG. 5(C).

The input circuit 29 monitors the status signal of the controlled object controlled by the control terminal (for example, whether it is in the ON state or the OFF state), and transmits the status signal together with a command when the signal changes or periodically. input to circuit 26; The transmitting circuit 26, which has received this command and status signal, provides the modulator 27 with a status signal in the format 50 shown in FIG. 5(c).

As described above, the interface unit 10 and the control terminals 20A to 20C are connected to the address decoder 14 or 2.
4 determines that the received data is addressed to its own terminal,
After receiving, a dead zone of time T2 is set, but this dead zone T
2 is a remote controller 30. Control terminal 20A-2
0C, if the time required for the interface unit 10 to send and receive signals is T1, and the processing time delay is TL, then T2>NX (TI+TL)...
1) However, N: is given by the value of the number of relay stages of the received signal.

In FIG. 4, R is a receiving section R, which is an optical/electrical converter 31 that converts an optical signal into an electrical signal;
a demodulator 32 that demodulates the received signal converted into an electrical signal by
and sends the demodulated data to the control unit C. The control section C has a reception data memory 33 for temporarily storing the demodulated data, an address decoder 34, a controller 35, a transmission circuit 36, and an input circuit 39. The transmitter T is
It has a modulator 37 and an electrical/optical converter 38, and the transmitting circuit 3
6 is activated by a command from the input circuit 39, and inputs the address code of the control terminal specified by the key switch SW, the number of signal relay stages N to the control terminal, and the packet type.
The format shown in FIG. 5(a) including the "Local" control code is assembled and sent. Modulator 37 modulates the signal having this data format 40 to electrical/optical converter 38
Enter.

The controller 35 receives commands (notifications) from the address decoder 34.
By sending out the above signal, the corresponding lamp of the display section DISPLAY is lit, and when a confirmation signal is received from the control terminal in response to the above signal, the confirmation code among the data stored in the received data memory 33 is checked, and the confirmation code is checked. is decoded and the corresponding lamp on the display section DISPIAY is turned off, and if the confirmation signal is not received before the waiting time T3 elapses, the lamp is made to blink.

This waiting time T3 is T3> (2N+1)X (T1+TL)...
(2) However, N: is given by the value of the number of relay stages of the transmitted signal.

The input circuit 39 activates the transmission circuit 36 upon receiving the designation of the control terminal and control content from the key switch SW.

FIG. 5(a) shows an example of the data format 40, which includes a ruler section 41 for identifying the start of a signal, and a customer A code 4 that is a fixed value for identifying the system.
2. Packet type 43 for identifying whether transmission is to the home bus BUS or communication within the local network, transmission address 44A for specifying the source, reply address 44B for specifying the reply destination, and specifying the receiving terminal. Reception address 45, counter 4 that specifies the number of signal relay stages N
6, a control code (home bus data code using the EIAJ standard) 47 for instructing the control terminal to operate, a redundant code 48 for detecting data code errors, and a trailer 49 indicating the end of the packet.

FIG. 5(b) shows the format for transmitting the status signal, and FIG. 5(C) shows the format of the confirmation signal.

Next, the operation of this device will be explained with reference to the time chart shown in FIG.

For convenience of explanation, the interface unit 1゜does not have a control target (control device) and has control terminals 2゜A, 20B, 2.
It is assumed that the control targets controlled by the control unit C of 0C are the first lighting lamp, the second lighting lamp, and the third lighting lamp in the building, and the second lighting lamp is turned on (ON) from the ICT (home controller). ) shall be sent.

(A) The home controller HCT sends a control code that instructs the lighting (ON) of the second illumination light to its own address as the source and destination, and sets the number of signal relay stages N to "2", and sets the control code to the control terminal 20B (reception destination address), and converts it into a signal S having a predetermined data format for the home path, and sends it out on the home path BUS.

The bus controller BUSCONT converts the format of this signal S into the data format 40 for the local network shown in FIG. 5(a).

That is, the packet type 43 is set to "local j, the sending address code 44A is the address code of the own terminal, the return address 44B is left unchanged, the number of signal relay stages 46 is set to "1," and the signal having this data format is sent to the transmitting circuit 16. Send to. The transmitter T modulates this signal and radiates it into the room space as an optical signal.

The optical signal radiated into the room space is first transmitted to the control terminal 2.
The control terminal 20A converts the received optical signal into an electrical signal using an optical/electrical converter 21, demodulates it using a demodulator 22, and then stores the received signal in a received data memory 23. When the received data is stored in the received data memory 23, the address decoder 24 extracts the destination address and the number of relay stages from the received data stored in the received data memory 23.
count value), determines from the reception address whether the received data is addressed to the own terminal or another terminal, and determines whether the count value is a predetermined value "0" indicating a non-relay stage. do. If the received data is addressed to your own device,
The controller 25 is notified of this fact, but in this case, since the count value is "1", the transmitting circuit 26 is notified that data addressed to another terminal has been received (relay operation should be performed).

The transmitting circuit 26 that received this notification uses the received data memory 23
Data stored in (receiving address, control code)
is read out and sent to the modulator 27 in data format 40 with the count value updated to "0". The transmission signal modulated by the modulator 27 is converted into an optical signal L2 by the electrical/optical converter 28 and radiated into space.

This optical signal L2 is received by the next stage control terminal 20B. In the control terminal 20B, the stage number code of the received data is "O".
”, the controller 27 determines that the own terminal is a non-relay stage and that the received data is addressed to the own terminal, reads out the control code of the received data stored in the received data memory 23, and reads this control code. is decoded, and an ON command is given to the second illumination lamp, and a dead zone of time T2 is set. As shown in FIG. 6, this time T2 satisfies T2≧Ox (TI+TL)−≧−0.

In this case, the control terminal 20B receives the signal from the control terminal 2OA, but also receives the signal from the interface unit 1°, and sends the control signal ((
There is a risk of repeatedly sending out the ON command), but since the dead zone T2 is provided, the interface unit l
If received from O, T2-≧-tx(TI+TL
), the repeated exit of the control signal (ON command) is prevented.

The control terminal 20C is also connected to the control terminal 20 from the control terminal 2OA.
B is received at the same time, but since the destination address is not addressed to the own terminal and the stage number code is "0", the address decoder 24 does not issue a command to either the controller 25 or the transmission circuit 26, and the reception The contents of the data memory 23 are erased.

When the above-mentioned time T2 has elapsed, the controller 2 of the control terminal 20B
5 gives a return command to the transmitting circuit 26.

The transmitting circuit 26 that received this return command specifies the reply destination address (address of the home controller HCT) 44B specified by the receiving pig, and the packet type is rHBSJ.
, and sends a confirmation signal of format 50 (in FIG. 5) with the stage number code "2" to the modulator 27. The modulator 27 modulates this confirmation signal and supplies it to the 11/optical converter 28.

The confirmation signal L3 sent by the control terminal 20B is sent by the control terminal 20
Received at A. Since the stage number code of the received signal is "2", the control terminal 2OA updates the stage number code to "1" and relays the received signal (confirmation signal), and the interface unit 10 that receives this signal L4, The stage number code is set to "OJ", the bus control circuit BUSCONT converts it to the home bus format, and sends it out on the home bus BUS. When the home controller HCT receives this confirmation signal within waiting time 73, T3>IX ( TI+TL) ・・・・・・・・・(
3) Transmission cancellation is canceled and transmission becomes possible. If this confirmation signal does not arrive within the above-mentioned waiting time 73, the same signal as the previously sent signal is retransmitted, and if there is no confirmation signal for the retransmission, for example, the display device is notified that the second lighting is abnormal. " is displayed.

When the control target (second illumination light) controlled by the control terminal 20B is turned on, the transmitting circuit 26 is activated, and the packet type is rHBsJ, the status code is rON, and the receiving address is of the home controller HCT to which the report is sent. address,
The source is the address of the control terminal 20B, and the number of signal relay stages is "
The control terminal 20B sends out a signal in the format "2", and as described above, this signal is relayed by the interface unit 1-10 and the control terminal 2OA, received by the home controller HCT, and sent to the home controller HCT.
changes the display contents of the display device that displays the status of the equipment controlled by the control terminal 20B. Note that when the home controller HcT receives the status signal from each of the control terminals 20A to 20C, it sends a confirmation signal to the control terminal that is the transmission source. [B] The case where the control terminal 20B is controlled from the remote controller 3o will be explained with reference to FIG.

By operating the key switch 39, the control terminal 20B
When the operation (ON operation) of the controlling device is specified, the remote controller 3o inputs the packet type 43 as "local", the reception address 45 as the address code of the control terminal 20B, and the transmission in the format shown in FIG. 5(a). The address 44A and the return address code 44B are the own address code, and the number of signal relay stages 46 is r2. The modulator 35 modulates the signal in the data format, and the electrical/optical converter 34 converts it into an optical signal and transmits it.

This optical signal L? First, interface unit 10
received at The interface unit 10 converts this optical signal L7 into an electrical signal with an optical/electrical converter 11, demodulates it with a demodulator 12, and then stores the received data in the received data memory 1.
Store in 3. When the received data is stored in the received data memory 13, the address decoder 14 reads the destination address and the number of signal relay stages (count value) from the received data stored in the received data memory 13, and the received data is transferred from the received address to the own terminal. It is determined whether the destination is a destination or another terminal, and the count value is a predetermined value "0" which means a non-relay stage.
Determine whether or not. If the received data is addressed to the own terminal, the controller 15 is notified of this fact, but in this case, since the number of signal relay stages is "2", the transmitting circuit 16 receives data addressed to another terminal. (Relay action should be performed)
Notify. Upon receiving this notification, the transmitting circuit 16 transmits the data stored in the received data memory 13 (receiving address,
control code) and sends it to the modulator 17 using a transmission data format (40) with the stage number code updated to rlj. The transmission signal modulated by the modulator 17 is transmitted to the electrical/optical converter 18
It is converted into an optical signal and radiated into space.

This optical signal Ls is received by the next stage control terminal 2OA. In the control terminal 20A, the number of signal relay stages of the received data is "
Since the count value is "l", the count value is converted to "o" and the relay operation is performed to transmit the optical signal R, in the same way as explained in (A) above. This optical signal is transmitted to the next stage control terminal 20.
It is received by B. Since the stage number code of the received data is "0", the control terminal 20B determines that the own terminal is a non-relay stage and that the received data is addressed to the own terminal, and sends the controller 27
reads the control code from the received data stored in the received data memory 23, decodes it, gives an ON command to the second lighting lamp, sets a dead zone of time T2, and determines the elapsed time of the dead zone T2. After receiving the confirmation signal, we will send it back to you. At this time, there is a confirmation signal. is a signal in a data format in which the packet type is "local", the return destination is the remote controller 30, and the number of signal relay stages is "2".

This confirmation signal sent by the control terminal 20B. is received by the control terminal 2OA. Since the number of signal relay stages of the received signal is "2", the control terminal 20A updates the received signal to the number of signal relay stages "1" and relays it, and the interface unit 10 that received this signal repeats the signal relay. Set the number of stages to ``
0" and relay. This i number i, +t sent by the interface unit 10 is the remote controller 30
received at The remote controller 30 converts this optical signal L1□ into an electrical signal with an optical/electrical converter 31, demodulates it with a demodulator 32, and then stores the received data in a received data memory 33.
Store in. When the received data is stored in the received data memory 33, the address decoder 34 stores the received data in the received data memory 3.
Read the reception address and the number of signal relay stages from the reception data stored in 3. In this case, the stage number code is "0",
Since the receiving address is the code of the own terminal, the controller 35
When the confirmation code in the received data stored in the received data memory 33 is confirmed to be a confirmation signal, the transmission suspension is canceled and the transmission becomes possible. If the confirmation signal is not received before the waiting time T3 has elapsed, the lamp lit by the transmission is made to blink to notify that the second illumination lamp is abnormal.

[C] When the control terminals 20A to 20C have a function of sending a signal containing a control code to a control terminal in another local network connected to the home bus BUS via another interface unit. By transmitting the packet type rHBs like the status signal, it is possible to control control terminals in other local networks, as shown by signal paths LtO to Ltz in FIG. 9.

Similarly, the packet type of the signal transmitted by the remote controller 30 is set to rHBS, and the home controller HT
If you specify a control terminal in C or another local network and send it with a control code, the signal path L3 is shown in Figure 9.
As shown by °, Ll, it is possible to control the home controller HTC and other control terminals in the local network.

In this way, in this embodiment, the interface unit 10 relays the packet type of the signal generated within the local network onto the home bus BUS when the format packet type is rHBSJ, but when it is "local", the interface unit 10 relays the packet type to the home bus BUS. , since it is relayed to the control terminal in the local hot work, from the remote controller 30 to the control terminal 20A~
Signals etc. to 20C do not affect other networks connected to the home bus BUS.

In addition, since the "state" of the devices controlled by each control terminal 20A to 20C can be reliably communicated to the home controller HCT and remote controller 30, the home controller HCT and remote controller 30 can communicate the "state" of the devices controlled by each control terminal. Can be controlled or monitored.

Further, the optical signal is transmitted at the transmission source by 1. It is sent by specifying the number of relay stages N and the address to the destination terminal, and is sent to the control terminals 20A~
20C specifies the above-mentioned transmission source as the reply destination, sends out a device status signal, and sends the device status signal to the interface unit 10 and the control terminal 2.
0A to 20C perform a relay operation when the stage number code of the received signal is not "O", and do not perform a relay operation when it is "0" and the address is not its own address, so the above-mentioned repeated relay is Definitely prevented.

In addition, the home controller HCT and remote controller 30 do not operate until the waiting time T3 elapses after sending the signal.
Since the transmission operation is stopped and the next transmission is performed after waiting for the confirmation signal to be returned, the control of the controlling device will not be disrupted.

In addition, the interface unit 10 and each control terminal 20
When the received signal is addressed to the own terminal, A to 20C set a dead zone T2 and interrupt the reception operation after reception, so they operate only with the first signal that arrives, and there is no risk of causing the controlled object to malfunction. .

〔Effect of the invention〕

As explained above, in the present invention, the interface unit connected to the home bus has a gateway function and converts the format of signals from the home bus to the local network and from the local network to the home bus and relays them. Communication between local networks can be performed without affecting the signals on the form bus, and in the local network, the signals sent by the interface unit, home controller, and control terminal have no destination address or In addition to the source address, the number of signal relay stages to the destination address is included, and when the signal is relayed, the number of signal relay stages to the destination terminal is updated and sent, and the value of the signal relay stage number of the received signal is updated to a predetermined value. By configuring the configuration so that the output operation is not performed if the destination is not addressed to the own terminal, the relay operation will not be repeated, and there will be no malfunction due to the above-mentioned optical signal looping around, so the cost and spatial outlook will be improved. It is possible to connect a multi-stage, two-way communication optical space transmission network to a home bus without worrying about the signal arrival route, and it is also possible to easily increase or decrease the number of control terminals.

[Brief explanation of drawings]

FIG. 1 is a network showing an embodiment of the present invention, FIG. 2 is a block diagram of the block configuration of the interface unit in the above embodiment, FIG. 3 is a block diagram showing a specific configuration of a control terminal in the above embodiment, and FIG. FIG. 5(a) is a block configuration diagram of the remote controller in the above embodiment.
~(C) shows the transmission data format in the above embodiment, FIG. 6 shows a signal time chart for explaining the relay operation in the above embodiment, and FIGS. 7 to 9 show the relay operation in the above embodiment. A signal path diagram for explanation, FIG. 1O is a diagram showing a conventional optical space transmission network, FIG. 11 is a block diagram showing the internal configuration of the optical transmission device in the above conventional example, and FIG. 12 is a problem with the above conventional example. FIG. 2 is a network diagram for explaining the points. 10-interface unit, 20A-20C-control terminal, 11.21.31-.-
Optical/electrical converters, 12.22.32 - Demodulators, 13.23
．． 33... Reception data memory, 14.24°34-
Address decoder, 15.25.35-Controller, 16
．． 26.36 - Transmission circuit, 17.27.37 - Modulator,
18.28.38-Electronic/optical converter, 19.29.39-
Input circuit, R-receiving section, T-transmitting section, c-control section. HCT-m-home controller, BUS-home bus, BUSCONT'-bus control circuit. Figure 4

Claims (4)

[Claims] (1) An optical space transmission network consisting of a plurality of control terminals that transmit and receive optical signals, a remote controller that transmits and receives optical signals, and an interface unit that transmits and receives optical signals, the interface unit being connected to a home bus, The optical signal has a format including a packet type, a reply destination address, a reception destination address, and transmission contents, and is transmitted by specifying the number of signal relay stages from the transmission source to the reply destination or reception destination, and the interface unit receives the signal. It has a function of updating and relaying the number of signal relay stages of a signal, and setting a dead zone time in consideration of the number of signal relay stages, and when this relay operation is a relay between the home bus and the network, the received signal is The control terminal converts the signal format according to the specified packet type and relays it, and the control terminal monitors the status of the control device and sends data on the status when the status changes or periodically, and sends the source address and reporting destination address. The control terminal specifies the number of signal relay stages to the reporting destination and sends the signal, and if the received signal is addressed to its own terminal, the control terminal decodes the transmission content and sends a control signal to the control device, and also transmits the signal. A confirmation signal specifying the number of signal relay stages up to the source is sent back to the source by setting a dead time that takes into account the number of relay stages, and if the signal is addressed to another terminal, the received signal is updated with the number of signal relay stages. Among the control terminals that have received a signal in which the number of signal relay stages of the received signal has been updated to a predetermined value, those whose received signal is not addressed to their own terminal do not perform the output operation. An optical space transmission network with multi-stage, two-way communication connected to a home bus. (2) After sending the signal, the remote controller stops the transmission operation for a predetermined return waiting time, and if the confirmation signal is received before the return waiting time elapses, the remote controller is able to resume the transmission operation. The optical space transmission network for multi-stage bidirectional communication with home bus connection according to claim 1. (3) Optical space transmission of multi-stage bidirectional communication with home bus connection according to claim 1 or 2, wherein the remote controller has a display section and displays a display corresponding to the received confirmation signal or status signal. network. (4) Optical space transmission of multi-stage bidirectional communication for home bus connection according to claim 1 or 2, wherein the updating of the number of signal relay stages is to decrease the number of stages by -1, and the predetermined value is the number of stages of 0. network.