JPS62253238A - Optical signal repeating installation - Google Patents

Abstract

PURPOSE:To reduce the power consumption of optical signal repeating installation, by actuating the light emitting or light receiving element corresponding to a communicating partner only at the time of operation of the repeating installation. CONSTITUTION:When a selecting signal is outputted from a host computer, the signal is received by a receiving circuit 1 and a microcomputer 3 is actuated. The microcomputer 3 detects the address and mode number of the destination of the transmission by analyzing the selecting signal and sets an interface 5 to its operating state by sending a command signal for releasing the quiescent mode through a transceiver 4. Then the microcomputer 3 sends the detected address of the destination of transmission to an address decoder 6, selects one transmitting circuit corresponding to the address out of a transmitting circuit group 8, and actuates the transmitting circuit by causing the light emitting element of the circuit only to emit light. Moreover, the microcomputer 3 further sends the received selecting signal to the interface 5 and the interface 5 sends the signal to the terminal device of the destination of transmission through the above-mentioned selected transmitting circuit. Thereafter, the interface 5 waits for the input of data signals from the host computer.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to 41 devices in optical signals, such as OA, FA
The present invention is suitable for systems in which many scattered terminal devices such as measuring instruments and control devices are connected to a small number of host computers and are comprehensively managed and controlled in such fields.

[Summary of the invention]

The present invention provides an optical signal repeater in which one first optical transmission line is connected to one input/output end, and a plurality of second optical transmission lines are connected to the other input/output end. This is intended to reduce power consumption by activating only the light-emitting element or light-receiving element that corresponds to the communication destination.

[Conventional technology]

Conventionally, in a center-to-end communication system that connects a host computer and a large number of scattered terminals, a single transmission line is used between the host computer and each terminal, which saves a lot of money. I needed it. As a countermeasure, each terminal device 9. ~9. ．．
10. ~10,1 transmission line is connected to n optical repeaters 11+~1
1 and 1, respectively, and transmit them from there to the host computer 12 using zero transmission paths.

In the above-mentioned center-to-end type system, a polling selection method is often adopted as a transmission control method. In this polling selection method, for a certain period of time, transmission and reception (3 is 1=1 communication between the host computer and one terminal device. Therefore, many transmission paths are combined into one transmission path, Furthermore, distribution from one transmission line to a large number of transmission lines does not require multiplexing, and a repeater can be easily constructed.

-In recent years, optical fibers have been widely used as transmission lines. Particularly in fields such as FA, transmission using optical fibers is suitable from the standpoint of anti-electromagnetic noise. In this case, the configuration of the repeater is optical-optical coupling/distribution or optical-electrical-
It is possible to combine and distribute light. In the former case, the combination
Since the distribution involves a lot of loss, the transmission distance of the optical fiber has to be shortened. In the latter case, an external power source is required.

[Problem that the invention seeks to solve]

In the optical-electrical-optical repeater described above, if a built-in battery or the like can be used in place of an external power source, long-distance transmission using optical fibers will become possible, and the range of applications will expand dramatically. However, electrical coupling and distribution requires a light-receiving element, an amplifier circuit, a logic circuit, a light-emitting element, etc. Therefore, the power consumption is large and it is extremely difficult to drive with a built-in battery or the like. Further, in explosion-proof areas such as factories, it is even more difficult to realize this because the capacity of the power supply is limited.

[Means for solving problems]

In the present invention, when the optical signal from the first optical transmission line is converted into an electrical signal, amplified, and distributed to the second optical transmission line, the information from the first optical transmission line is A transfer destination is extracted from the above, and only the light emitting element corresponding to the extracted transfer destination among the plurality of light emitting elements facing the second optical transmission path is operated, and the second optical transmission When converting the optical signal from the optical transmission line into an electrical signal and amplifying it and transmitting it to the first optical transmission line, the communication destination is extracted in advance from the information from the first optical transmission line, and the communication destination is extracted from the information from the first optical transmission line and Of the plurality of light receiving elements facing the optical transmission path, only the extracted light receiving element is operated.

〔Example〕

FIG. 1 shows an optical signal relay device according to the present invention.
This corresponds to the optical repeater shown in FIG.

In FIG. 1, reference numeral 1 denotes a host side optical receiving circuit, which is connected to a light emitting element for transmitting an optical signal provided on the host computer side in FIG. 5 via one optical fiber, although it is not shown. A light receiving element PDO such as a photodiode or a phototransistor is provided. 2 is a host side transmission circuit connected to a light receiving element for receiving an optical signal provided on the host computer side via the one optical fiber,
A light emitting element LEDo such as a light emitting diode is provided.

3 is a one-chip microprocessor for controlling transmission and reception to the host side and the flow of information within the relay device;
is a bidirectional path transceiver, 5 is a serial interface for controlling transmission and reception on the terminal side, 6 is an address decoder, and 7 is a group of receiving circuits on the terminal side, which includes n light receiving elements PD.
, ~PD, are provided, and the signals received by each light receiving element are transmitted to a differential amplifier 7. ~7. ．． (However, only 7□ is shown). Each of the light receiving elements PD, .about.PD, is optically connected to a light emitting element provided in each of the n terminal devices (see FIG. 5) via zero optical fibers (not shown). Further, the transceiver 4 and the interface 5 are driven by predetermined signals from the microcomputer 3.

8 is a terminal side transmitting circuit group, which includes n light emitting elements [, ED, -
An LED is provided, and each light emitting element is connected to an AND gate 81.
Light is emitted by driving the transistor with an output of ~8° (however, only 8□ is shown). Each of the light emitting elements LED to LED7 is optically connected to a light receiving element provided in each of the n terminal devices via the above-mentioned 0 optical fibers (not shown).

The optical repeater shown in FIG. 1 uses a built-in battery as a power source. Furthermore, all ICs, LSIs, etc. used in the parts that perform digital signal processing are composed of CMO3 circuits with low power consumption. In particular, the microprocessor 3, interface 5, etc. are suspended (HALT) when they are not operating.
This is done to further reduce power consumption.

The selecting signal sent from the host computer includes information such as the address and mode number of each terminal. There are two types of modes: MODEI is the data transmission mode from the host computer, and MODEI is the data transmission mode from the host computer.
E2 is the transmission mode from the terminal.

Next, the signal transmission procedure in the case of MODEI will be explained with reference to FIG.

In the initial state, the microprocessor 3 and interface 5 are in a dormant state. In this state, when a selecting signal is output from the host computer, it is received by the receiving circuit 1 through the optical fiber.

This causes the microprocessor 3 to become operational.

Next, the microprocessor 3 analyzes the selecting signal to detect the destination address and mode number. Next, a command signal for canceling the hibernation mode is sent to the interface 5 through the transceiver 4, thereby putting the interface 5 into the operating state.

Next, the microprocessor 3 sends the detected destination address to the address decoder 6, and the address decoder 6 selects one transmitter circuit corresponding to the above address from the transmitter circuit group 8 and causes its light emitting element to emit light and enters an operating state. It is accomplished.

The microprocessor 3 further sends the received selecting signal to the interface 5.
is sent to the destination terminal through the selected transmission circuit. Then, it enters a state in which it waits for a data signal to be input from the host computer. When a data signal is input to the receiving circuit l, the microprocessor 3 and the transceiver 4
, the interface 5, and the selected transmission circuit to a predetermined destination terminal. This relay operation between reception and transmission is repeated until a signal indicating the end of data is detected in the data signal.

When a signal indicating the end of data is input, the microprocessor 3 deselects the transmitting circuit and sends a pause command signal to the interface 5 to put it into a pause mode. The microprocessor 3 itself also executes the suspend command and stops all functions.

Next, in the case of MODE 2, the transmission procedure shown in FIG. 3 is performed. First, a selecting signal is sent from the host computer, and as a result, the microprocessor 3 and interface 5 become operational, and the address decoder 6 selects one receiving circuit from the receiving circuit group 7 and operates its light receiving element. state, and transmitting circuit group 8
Select one of the transmitting circuits. A selecting signal is sent to the corresponding terminal device through this selected transmission circuit. This causes the terminal to send out a data signal, which is received by the selected receiving circuit and sent from the transmitting circuit 2 to the host computer via the interface 5, transceiver 4 and microprocessor 3.

In the case of MODE 2, it is necessary to amplify the minute current outputs of the light receiving elements PD, -PD in the receiving circuit group 7 to a size that can be handled by a digital circuit using an amplifier circuit. That is, in the case of reception, a considerable amount of power is always consumed in the amplifier circuit. Therefore, in this embodiment,
The amplifier circuit is constructed using differential amplifiers 71 to 7 whose power consumption can be controlled by external human power. Actually, this is realized by connecting the output of the address decoder 6 to the power consumption control terminals of the differential amplifiers 71 to 7.

The above explanation is for the case of the simplest transmission procedure, but as shown in FIG. It can be applied to

Further, one receiving circuit in the receiving circuit group 7 is operated to transmit data from the transmitting circuit 2, and at the same time, one or more transmitting circuits in the transmitting circuit group 8 that do not correspond to the above-mentioned receiving circuit are operated. It is also possible to do so.

〔Effect of the invention〕

Rather than driving all the light emitting elements, light receiving elements, amplifiers, etc. that correspond to all terminals, only those that correspond to the terminal that is currently communicating are driven.
Power consumption can be reduced. Therefore, optical signals can be relayed and amplified with low power, and can be driven by a built-in battery or the like. This makes it possible to configure a system with excellent portability and safety. It can also be a great advantage especially when installed in hazardous locations such as explosion-proof areas.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a timing chart showing a transmission procedure in data transmission mode from the host computer side, and Fig. 3 shows a transmission procedure in data transmission mode from the terminal device side. FIG. 4 is a timing chart showing the transmission procedure when confirming data reception, and FIG. 5 is a block diagram showing the configuration of a conventional Santa-to-end type system. In addition, in the symbols used in the drawings, l・・−・−−−−−−−−−−−−・Host side receiving circuit 2−−−1・−・−111−−−・−Host side transmission Circuit 3-----11--------Microprocessor 7-----1--Terminal side receiving circuit 8-- 1111---One terminal side transmitting circuit PD, ~PD, - Light receiving element LED, - LED, - Light emitting element.

Claims (1)

[Claims] 1. An optical signal in which one first optical transmission line is connected to one input/output end and a plurality of second optical transmission lines are connected to the other input/output end. When the repeater converts the optical signal from the first optical transmission line into an electrical signal, amplifies it, and distributes it to the second optical transmission line, based on the information from the first optical transmission line, A transfer destination is extracted, and only a light emitting element corresponding to the extracted transfer destination among the plurality of light emitting elements facing the second optical transmission line is operated, and the second optical transmission line is configured to operate. When converting the optical signal from the optical transmission line into an electrical signal, amplifying it, and transmitting it to the first optical transmission line, extract the communication destination from the information from the first optical transmission line in advance, and What is claimed is: 1. An optical signal repeater characterized in that the optical signal repeater is configured to operate only the extracted light receiving element among a plurality of light receiving elements facing an optical transmission path. 2. The optical signal relay device according to claim 1, which is driven by a built-in battery. 3. Claim 1, characterized in that one of the second optical transmission lines is used for reception while at least one other optical transmission line is used for transmission. The optical signal relay device described above.