JPS5875337A - Direction matching system of data communication system - Google Patents

Abstract

PURPOSE:To assure the matching of directions between the transmission and reception for a data communication system using a light beam, by comparing a test data transmitted at a station of one side with a received reflected data. CONSTITUTION:A data is transmitted from a slave station including transceivers 6-9, display terminals and computers. This data is reflected to the slave station from a master station consisting of reflectors 4 and 5. This reflected data is received at the slave station that transmitted the corresponding data. Then the transmitted data is compared with the received data for each bit, and the directions are matched with each other between the transmission and reception when the coincidence is obtained from the above-mentioned comparison. In such way, it is possible at one time to match directions for both transmission and reception. In addition, the reliability can be confirmed for both transmitted and received data.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes optical space propagation technology to communicate between two stations such as a master station and a slave station. This relates to a direction alignment method that performs all direction alignment between a station and a master station.

As shown in the first example, one master station 101 and a plurality of slave stations 1
In a communication system in which optical beams 105 to 107 are used to transfer data between slave stations 102 and 104 or between slave stations via a master station, for example, slave stations 102 and 103 communicate with master station 101.
When the slave station 104 attempts to adjust the direction with the master station 101 while communicating with
A constant signal is transmitted toward station 104, and the direction is adjusted so that the reception level of the signal at slave station 104 is maximized.

However, with this conventional orientation method,
Since the direction is adjusted only by the original beam heading from the master station 101 to the slave station 104, from the slave station 104 to the master station 104,
It wasn't a question of whether or not the direction of the original beam heading toward the target was properly aligned.

In addition, although the position where the receiving level reaches the maximum level is detected, it is difficult to determine whether this maximum receiving level is a level at which the slave station 104 can reliably reproduce data.

Furthermore, during the orientation period, the master station 101 constantly transmits a constant signal to the slave station in order for the slave station 104 to detect the maximum reception level.

During this period (t), the master station 101 is occupied for the direction adjustment of the slave station 104, and communication between the master station 101 and other slave stations 102 and 103 is interrupted. The downside is that you won't be able to do it.

The main object of the present invention is to provide a direction adjustment method that can reliably perform direction adjustment in both directions, transmitting and receiving, and guaranteeing reproduction of received data.

Another object of the present invention is to provide an entire direction adjustment system that allows direction adjustment without affecting communication between other stations.

To achieve this objective, the present invention provides a system for communicating with each other between at least two stations (-- transmitting test data from ten thousand stations and receiving this test data. Next, the other station sends back data t-,
- It is a special mission that all stations compare the transmitted test data and the received return data, and when the two match, it is determined that orientation has been achieved.

Embodiments of the present invention will be described in detail below with reference to the drawings.

#! FIG. 2 shows the configuration of an example of a communication system according to the present invention, which includes terminals and computers installed within the premises.

In the figure, two rooms 1.2 are connected by a coaxial cable 3, and a reflector 4.5 is installed at a high place in each room for this coaxial cable 3, and connected to the coaxial cable 3 by a T-branch. has been done.

In addition, transceivers 6.7, 8, and 9 are provided in the lower parts of each room 1 and 2, facing the reflectors 4 and 5, and each transceiver 6.7, 8, and 9 is connected to a display terminal, etc. The terminals of the computer are connected to devices 10, 11, 12 and 13 consisting of computers.

And transceiver 6 and devices 10, 7 and 11°8 and 1
2.9 and 13 each accommodate a slave station 1tn1, and reflectors 4 and 5 each constitute a master station. These slave stations can be moved.

Reflectors 4 and 5 each have a light emitting diode 1.
Similarly, the transceivers 6 to 9 are provided with light emitting diodes 18 to 21 and photodiodes 22 to 2, respectively.
5 is provided.

In such a configuration, for transsheets <6 to 9,
Receives and receives transmission data from the corresponding devices IO to 13,
The infrared rays emitted by the light emitting diodes 18 to 21 are intensity-modulated, and the infrared rays are emitted towards the corresponding flapers 4 and 5.

The light emitting diodes 18-21 are designed to emit light only when data is transmitted from the devices 10-13.

The infrared light emitted from the transceivers 6 to 9 is received by the photodiodes 16 and 17 of the reflectors 4 and 5, converted into electrical signal data, and sent to the coaxial cable 3. The friend data σ is sent out to the coaxial cable 3, and the data is transmitted to all nine cables connected to the coaxial cable 3, including the flaper.

□Reflector 4 that receives data from coaxial cable 3
and 5, the intensity of the infrared S emitted by the light emitting diodes 14 and 15 is modulated with data, and the infrared rays are diffused and emitted toward all the trunks 6 to 9 in the room. After receiving the infrared rays emitted from the reflectors 4 and 5 by the photodiodes 22 to 25 of the Trunk Coopers 6 to 9 and converting them into electrical signal data,
The data is sent to devices IO-13.

When friends send data from a device such as a terminal in a certain room, that data is not only received by all devices such as terminals in other rooms, but also transmitted by devices such as other terminals in the same room. It will be received by the device in the same way.

The reflectors 4 and 5 are configured to diffuse and emit infrared light in a range that can be simultaneously received by terminals installed at all locations in each room. In this case, the dyed infrared rays may be emitted in a manner that can be received by the corresponding refrigerants 4 and 5.

FIG. 3 shows the structure of an example of the transceiver on the slave station side of FIG. 2, which includes a device for implementing the orientation method according to the present invention.

In the figure, 30 is a switch circuit including switch groups 31 to 36, 37 is a signal generator that generates a transmission request signal for direction adjustment, 38 is a data generator that generates data for direction adjustment, and 39 is a clock signal generator. a clock generator; 40, a data sense circuit that detects whether or not another transceiver is communicating; 41, a detection circuit that detects mismatch between transmitted data and received data; 42-4;
4 is a flip-flop, 45 to 48 are AND gates 49
5 is a light emitting diode constituting the orientation display 2 panel;
0 is a signal line for a transmission request signal, 51 is a detailed signal line for a transmission permission signal, 52 is a signal line for transmission data, 5
3 indicates a signal line for receiving data, and 54 indicates a signal line for transmitting clock.

Referring to FIG. 3, interface signals 50-54 between device 10 and transceiver 6 will first be described.

When the device IO is transmitting data, the signal line 50
The transmission request signal f is set to "1" (hereinafter referred to as on).

In the transceiver 6, when the transmission request signal from the device 10 is on and data transmission is possible, as will be described in detail later, the transceiver 6 turns on the transmission permission signal 51.

In the device 10, while the transmission permission signal is on, the signal f152 is
, transmission data (
The transceiver 6 modulates the light emission of the light emitting diode 18 with this transmission data.The transceiver 6 also transmits data received from the reflector 4 (a series of bits "1#" and "aO").

10'' series) is received by the photodiode 22, placed on the signal line 53, and sent to the device IO side as received data.

In the transceiver 6, a clock generator 39 generates a timing clock signal for transmitting transmission data,
The signal #54 is sent to the device IO.

Next, the operation of transmitting and receiving data between the devices 10 to 13 and the case where data is sent from the device 10 to the device 12 will be described in detail.

The transceiver 6 checks the output of the photodiode 22 with the data sense circuit 40, and if there is no output, that is, if no other transceiver is transmitting,
When the output of the data sense circuit 40 is set to 10'' (hereinafter referred to as off) and the output of the photodiode 22 is present,
That is, if another transceiver is transmitting, the output of the data sense circuit 40 is turned on. Also-
In the device IO, the transmission request signal on the signal line 50 is turned on prior to data transmission.

In the transceiver 6, if the transmission request signal is on and the output of the data sense circuit 4o is off, the AND gate 45t is opened and the flip-flop 42t is set. Thereby, the AND gate '46 is opened and the signal line 51 is opened.
Turn on the transmission permission signal.

Once the transmission permission signal 19 is turned on in the flip-flop 42, the photodiode 22 receives the data transmitted by the transceiver 6 and returns it to the flip-flop 4, as will be described later. Even if the output of the data sense circuit 40 is turned on, it remains off until the next transmission request signal is turned on, or until the detection circuit 41 detects a mismatch, as will be described later. shall be.

The ON output of the flip-flop 42 turns on the sending S permission signal and opens the AND gate 48.
Light emitting diode 18 according to the transmitted data of signal 1 52
Make it emit light from.

Even if the transmission request signal is on, the data sense circuit 40
If the output of is on, the AND gate 45 closes and the transmission permission signal is not turned on, so the device 10 does not transmit data and waits for the transmission permission signal to turn on with the transmission request signal t turned on. wait. After that, the data sense circuit 4
When the output of 0 is turned off, the flip-flop 42 is set, the transmission permission signal is turned on, and the device 10 starts transmitting. Accordingly, the entire light emission of the light emitting diode 18 is modulated by the transmission data sent from the device 110, and the light is sent to the reflector 4.

When the device 10 finishes transmitting data, it turns off the transmission request signal. This resets the flip-flop 42, turns off the transmission permission signal, and stops the light emitting diode 18 from emitting light.

During the period when the transmission enable signal is on, the transceiver 6 transmits the data received from the device 10 to the reflector 4 via the light emitting diode 22.

The reflector 4 receives data emitted from the transceiver 6 with a photodiode 16, converts it into an electrical signal, and sends it to the coaxial cable 3. This data reaches the reflector 5 via the coaxial cable 3, and the reflector 5
are transmitted by the light emitting diodes to all transceivers 8.9 facing the reflector 5, and
Similarly, all transceivers 6 facing the reflector 4
Sent towards ゜7.

The operation of adjusting the direction of the transceiver 6 when the slave station including the transceiver 6 is moved will be described with reference to the waveform diagrams of FIGS. 4 and 5.

In that case, turn the direction switch 30 in the opposite direction to that shown in the figure, disconnect each of the rod signal lines 50 to 54 from the device 10 from the transceiver 6, and also disconnect the signal generator 37 from the transceiver 6.
The direction adjustment transmission request signal is input to the AND gate 45, the output of the AND gate 47 is input to the AND gate 48, and the output of the flip-flop 44 is applied to the light emitting diode 49.

The signal generating device 37 generates the direction alignment transmission request signal shown in FIG. 4(a), which is repeated every 199 m9elli. The transmission request signal as shown in the enlarged view of FIG. 4(b) is synchronized with the clock signal shown in the clock signal of FIG. 4(c) and has a length of 16 bits.

Further, in the data generator 38, as shown in FIG. 5(a), in synchronization with the clock signal of FIG. ” generates direction alignment data that repeats the data alternately. The data from this data generator 38 is passed through the AND gate 47.
and 48t- to be applied to the light emitting diode 18.

When the direction adjustment transmission (!I request signal) from the signal generator 37 is on, the data sense circuit 40 determines whether another station is communicating or not. When this is detected, the output of the AND gate 45 is turned on.The flip-flop 42 is set when the output of the AND gate 45 is on, turns on the transmission permission signal from the AND gate 46, and turns on the output of the AND gate 47. and 48. Thereby, the orientation data from the data generator 38 is transferred to the AND gate 47.
↓ and 48, the light is applied to the light emitting diode 18, and an optical signal corresponding to the data is sent out from the light emitting diode 18.

The photodiode 22 receives return data from the glue flaper 4 as a master station, and inputs it to the detection circuit 41.

The detection circuit 41 compares the transmitted data for direction adjustment and the received data, and turns the output on when a mismatch is detected, and turns off the output when no mismatch is detected.

Therefore, when alignment is unsuccessful and data corresponding to the transmitted data is not received, the output of the detection circuit 41 is turned on and the flip-flop 43 is set. Additionally, the AND gate 46 is closed and the transmission permission signal is turned off.

AND gate 47 is activated by turning off the transmission permission signal.
and 48 are closed, the sending of the direction adjustment data is stopped, and the flip-flop 44 takes in the output of the flip-flop 43 as new data at the timing when the transmission permission signal changes from on to off. Turn off the output of the direction adjustment display 49 so that it does not light up. In this way, orientation continues.

If the direction alignment is successful and the transmitted data is received as received data as is, the output of the detection circuit 41 remains off and is not set in the flip-flop 43. At this time, the transmission of the orientation data continues while the orientation transmission request signal is on, but when it is turned off, the flip-flop 42 is reset and the output of the AND gate 46 is turned off. Sea and gates 47 and 48 are closed and stop sending out orientation data. Further, the flip-flop 44 is latched at the timing when the output of the AND gate 46 changes from on to off, and the output lights up an indicator lamp consisting of a light emitting diode 49 to indicate that the orientation has been adjusted. The 7 flip-flop 44 outputs the state of the 7 flip-flop 43 at the timing when the transmission permission signal changes from on to off, or as long as the direction is adjusted successfully9, the flip-flop 43 is in the reset state, so the flip-flop 44 The output of remains on,
The direction adjustment indicator lamp 490 continues to light up, and it can therefore be determined that the direction adjustment has been completed.

While the transceiver 6 of one slave station is transmitting direction adjustment data, the transceiver of the other slave station detects that the data is being transmitted by the data sense circuit 40 and enters a waiting state without issuing a transmission request signal. Therefore, no collision occurs between the direction adjustment data and the data being transmitted by another station. Furthermore, it goes without saying that if a certain slave station is not transmitting orientation data, another slave station can transmit it.

When the data sense circuit 40 detects that another slave station is communicating, even if the direction adjustment transmission request signal is turned on, the transmission permission signal is not turned on.
Orientation data is not transmitted. In this case, since there is no point where the transmission permission signal changes from on to off, no new data is sampled in the flip-flop 44. Therefore, direction adjustment at a certain slave station waits until the next time the conditions are met, that the transmission request signal is not turned on and the data sense circuit 40 detects that the other station is not transmitting data. state, during which
Orientation data is not transmitted.

FIG. 6 shows the structure of the master station in FIG.
-PJe of each specific configuration is shown, and an example of the reflector 4 is shown.

As shown in the figure, the next light emitted from the opposing transceivers 6 or 7 is received by the photodiode 16 and converted into an electrical signal, and then the electrical signal is amplified by the amplifier 60 and sent to the coaxial cable via the coupling transformer 61. Send to 3. On the other hand, the signal on the coaxial cable 3 is taken into the amplifier 63 via the coupling transformer 62, where the signal is amplified, and then converted into light by the light emitting diode 14, which is transmitted to the opposite transceiver 6.
and send to 7.

In short, the reflector 4 receives transmission data from an opposing transceiver, sends the data to another reflector, and also sends back data to the transceiver that sent the transmission data. .

FIG. 7 shows 1fFl of the specific configuration of the detection circuit 41 in FIG.
lt is shown, 70 and 71 are flip flops ~
72 is an oscillator that generates a reception clock, and 73 is an exclusive OR circuit. Transmission data is input to the D terminal of the 7-lip flop, a transmission/old clock signal is input to the CK terminal, and reception data is input to the (b) path 73 and oscillator 72, respectively. In the oscillator 72, bit 10'' of the received data
The reception sampling clock pulse starts to occur at the midpoint of one bit of received data starting from the point of change from 11'' to 11''.

A D-type flip-flop 70 samples the transmitted data with the transmit clock signal and holds it for one bit time. The circuit 73 performs an exclusive OR of the output of the flip-flop 70 and the received data, and the resulting value is sampled by the t-D type flip-flop 71 using the receive clock from the oscillator 72 for transmission and reception. When the data do not match, the output of the flip-flop 71 is turned on.

In addition, in the embodiment shown in FIG. 2 described above, an example was shown in which communication is performed between the reflector and the transceiver using infrared Vt-, but the invention is not limited to this, and other optical space propagation means may be used. It may be realized by

Next, the number of transceivers facing each reflector is not limited to the example shown in the figure, and may be any number as long as it is one or more.

Furthermore, although the above embodiment shows an example of connecting two rooms with a coaxial cable, it is also possible to connect different locations within the same room with a coaxial cable. A transmission path such as an optical fiber that transmits the information as it is may also be used.

Furthermore, data communication between devices such as terminals under its control may be performed by using a single lever instead of connecting two or more flaps with a transmission line such as a coaxial cable.

According to the embodiment of the present invention described above, the data transmitted from the slave station is folded back from the master station to the slave station during fs (II), and the data sent back by the master station is simultaneously received; Since the transmitted data and the received data are compared bit by bit, it is possible to check whether the received data is compatible with the 1! axis!! It has the effect of being able to do both at the same time.

In addition, since the data for direction adjustment is sent to the master station after confirming that other stations are not communicating, when one station starts direction adjustment, other stations can communicate. It will never go away.

Furthermore, since the data for orientation adjustment is transmitted at a predetermined period for a certain period of time, the master station does not have to constantly transmit data while the slave stations are performing the entire orientation adjustment, which saves energy. effective.

The embodiments of the present invention described above describe a system that has one master station and a plurality of slave stations, and communicates between the master station and the slave stations, or between the slave stations via the master station. However,
It goes without saying that the present invention can be applied to a case where there is one master station and one slave station and communication is carried out between them, or when communication is carried out between 12 slave stations.

As described above, according to the present invention, it is possible to simultaneously adjust the image sending and receiving directions.

It is also possible to determine whether the received data is reliable.

Also, if the system is configured with a master station and multiple slave stations, 1
There is no possibility that communication with other stations will become impossible due to one slave station starting direction adjustment.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram for explaining a conventional direction adjustment method, FIG. 2 is a configuration diagram of an embodiment of a communication system according to the present invention, and FIG. 3 is a transceiver that realizes the direction adjustment method according to the present invention. FIG. 4 and FIG. 5 are signal waveform diagrams for explaining the operation of the circuit in FIG. Circuit Diagram of Embodiment - FIG. 7 is a circuit diagram showing an example of a specific configuration of the detection circuit of FIG. 3. 4.5...Reflector, 6-9...Transceiver,
14.15.18-21...Light emitting diode, 16°17.22-25...Photodiode, 37...
Direction alignment transmission request signal generator, 38...Direction alignment ¥11 Figure ¥J4- Mouth 5 Figure ``'' f, b Figure 7 B

Claims (1)

[Claims] 1. In a data communication system in which at least two stations communicate with each other using source beams, when direction alignment is performed at -10,000 stations, the -10,000 stations The station receives and transmits all the test data, the other station that received the test data transmits return data, and the one station compares the transmitted test data with the received return data. , and when the two match, it is determined that the orientation has been adjusted. 2. The direction adjustment method according to claim 1, wherein the test data is transmitted from the ten thousand stations at predetermined intervals. 3. Towards a data communication system that uses all original beams to perform mutual communication between a master station and a number of slave stations °C1 - When aligning directions with ten thousand slave stations, between nuclei, It detects that there is no communication between another slave station and the master station, sends the test data to the master station, receives all of the test data, and then sends back data from the master station. At 10,000 slave stations, the transmitted test data is compared with the return data, and when the two match, direction alignment is achieved at 7'C! A direction adjustment method characterized by determining that it is a friend. 4. Claim 3, characterized in that test data is transmitted from the above-mentioned ten thousand slave stations at predetermined intervals.
Orientation method described in section.