JPS5980041A - Digital multiplex optical coupling controller for installation on airplane - Google Patents

Abstract

PURPOSE:To decrease the number of signal transmission lines and to improve efficiency for synchronous processing and data conversion to attain the simultaneous processing of transmission and reception, by processing simultaneously both fixing of synchronism and data exchange between processors and allotting a specific wavelength to each processor to perform multiplexing of optical wavelength. CONSTITUTION:Computers 26-28 deliver a command to a transmitter TX with the function within a command word defined as a synchronous pattern in order to obtain synchronism among processors 11-13. The transmitter TX performs a serial transmission with an optical signal. The reception side checks the function and applies an interruption to computers 26-28 if the synchronism is obtained. Thus the synchronous processing is carried out. The transmitter TX transmits the data after designating the destination of the data and the number of data. The reception side confirms the data transfer to own station and stores successively the transmitted data to designated memories. When this storage is over, the end of reception is informed to the computers 26-28. Processors 11-13 have two receivers RX1 and RX2, and therefore the receptions are through simultaneously with two stations as long as the number of transferred data is equal. This fact means that the transfers are through simultaneously among three channels.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aircraft-mounted digital multiplexing optical coupling control device.

In recent years, the digitization of aircraft onboard systems has progressed, and with the computerization of cockpits, the installation of digital processing devices has become essential. ACT (Acti) is a hot topic recently.
ve Control Technology) is also considered to be based on the premise of using a digital computer with high processing power.

High reliability is an important issue when it comes to controlling control equipment.
One solution is to multiplex devices as shown in FIG. When using a multiplex system, data exchange is required to synchronize each channel and to compare data. In the actual system, synchronization and data exchange are performed in the sensor unit 1.
In many cases, this is performed by a digital calculation unit 2 that processes the output of the camera and an actuator drive unit 3 at the next stage. Note that 4 indicates a servo actuator. In particular, the digital calculation section 2
data exchange is important. Conventionally, multiplex control devices, especially multiplex control devices that require real-time processing,
A transmission line for establishing synchronization between each processing device and a signal transmission line for exchanging data are often provided separately, and each processing device is connected in a loop using the same path line. Therefore, synchronization establishment and data exchange are configured using separate hardware, which has the disadvantage of complicating the hardware configuration and increasing the number of programs on the computer side. In addition, data transfer is a loop-like connection, and data must be transferred between two points after the transfer between two points is completed, so it takes a long time to complete all data conversion. It also had the disadvantage that it required

This invention was made in view of the above points,
An optical fiber is used for the signal transmission line, and each device has one transmitter for establishing synchronization and data transfer, and a number of receivers corresponding to the processing devices for exchanging data. By simultaneously performing exchange between processing devices and assigning a specific wavelength of the optical signal to each device,
Since we are assuming a signal body, there will be three processing devices. 14, 15, and 16 are optical fibers that connect the processing devices 11 to 13, and 17, 18, and 19 are the optical fibers that connect the respective processing devices 14,
It is a T coupler or star coupler (hereinafter simply referred to as a coupler) that couples 15.16. Each of the processing devices 11 to 13 includes an optical coupler 20 to 22 composed of one electrical/optical converter E10 and two optical/electrical converters 0/E, one transmitter TX, and two signal transmitting/receiving devices 23 to 25 consisting of receivers RX, RX2, and a computer (CPU) 2.
6 to 28, and interfaces 29 to 31 that connect the computers 26 to 28 and the signal transmitting/receiving devices 23 to 25.
has. The transmitter TX of the processing device 11 includes an electrical/optical converter E10, an optical fiber 14, a coupler 17 . It is connected to the receiver RX of the processing device 12 and the receiver RX2 of the processing device 13 via the optical/electrical converter 07E. Similarly, the transmitter TX of the processing device 12 includes an electrical/optical converter E10, an optical fiber 15. Coupler 18. A receiver RX2 of the processing device 11, a receiver RX of the processing device 13, via the optical/electrical converter 0/E.
connected to. The transmitter TX of the processing device 13 includes an electrical/optical converter E10, an optical fiber 16, a turnip 219 . It is connected to the receiver RX of the processing device 11 and the receiver RX2 of the processing device 12 via the optical/electrical converter 0/E.

FIG. 3 shows the signal transmitting/receiving device 23 of the processing device 11 and the computer 2.
6 is a block diagram showing an interface that connects
32 to 35 are input/output control devices, 36 is a buffer memory,
37 is a control device for the buffer memory 36, and 38 is a data channel. The buffer memory 36 has stored contents that are transmitted from the transmitter TX or received from the receiver RX1 . It is used to store received data that has been received and terminated by RX2. In order for the computer 26 to use this data, it is first transferred to the internal local memory via the data channel 38. Note that the buffer memory 36 may be accessed directly from the computer 26 without going through the data channel 38 by arranging it on the same level as a local memory.

Such an interface between the computer 26 and the signal transmitting/receiving device 23 also has a processing device 12.13.

The above is the configuration of the digital multiplexing optical coupling control device which constitutes one embodiment of the present invention.Next, its operation will be explained.

Figure 4 (a), (b) shows the format of the signal word;
In the figures, (a) shows the format of the command word, and (b) shows the format of the data word. IO transmission rate
MUPS, and one word consists of 20 bits. The first three bits are a sync pattern used to determine the beginning of a word on the receiving side, and the difference in sync pattern distinguishes between a command word and a data word. The last 1 bit is parity and the remaining 16 bits are information. In the case of a data word, 16 bits of data are entered here, but in the case of a command word, the function,
You can specify the receiving station and receiving memory area.

In the embodiment described above, the synchronization signal and data are transmitted from one transmitter TX, but these are distinguished by instructions from the computers 26-28.

In order to synchronize the processing units 11 to 13, each computer 26
28 uses the function in the command word in FIG. 4(a) as a synchronization pattern, and issues a command to the transmitter TX via the input/output control device 32.

When the transmitter TX receives command data including other commands, it serially transmits the command data as an optical signal via the electrical/optical converter E10 of the optical coupler 20. When the receiving side determines that the first three bits are a command word, it checks the function and, in the case of synchronization, immediately interrupts the computers 26 to 28 to start synchronization processing.

To transfer data, first set the data to be transferred in the transfer area of the buffer memory 36, then specify the data transfer destination, the number of data, etc. via the input/output control device 32, and issue a transmission command. The transmitter TX first sends out a data start command, then sends designated data, and finally sends a data end command. On the other hand, the receiving side checks the contents of the command word, and if it determines that the data is to be transferred to its own station, it sequentially stores the subsequently transmitted data in the designated area of the buffer memory 36.

When the data end command is received, the computers 26 to 28 are notified of the completion of data reception. The processing devices 11 to 13 have two receivers RX, RX2, and in order to enable simultaneous processing, the access time to the buffer anomaly 36 is shortened, and the receiver RXI.

RX2. Access between the transmitter TX and the computers 26 to 28 is performed in a time-division manner. Therefore, if the number of transferred data is the same, reception from two stations ends almost simultaneously. This means that transfers between the three channels are terminated at the same time.

Optical fiber is used for the transmission line, and each processing device has an optical coupler and
It consists of one transmitter that establishes synchronization and transfers data, a number of receivers corresponding to the processing devices that exchange data, and a computer.It establishes synchronization and exchanges data between each processing device. At the same time, the optical fiber/
By assigning a specific wavelength to each processing device, the number of signal transmission lines can be reduced, and the processing efficiency of synchronization processing and data conversion can be improved. 2. Simultaneous transmission and reception processing is possible, and electrical interference between each processing device can be achieved, which has many excellent effects.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a standard multiplex configuration, Fig. 2 is a block diagram showing an embodiment of the present invention, Fig. 3 is a block diagram showing a computer interface, and Fig. 4 (a). ,(
b) is a diagram showing the signal word formatter;
) indicates a command word, and (b) indicates a data word. In the figure, 11 to 13 are processing devices, 14 to 16 are optical fibers, 17 to 19 are T couplers or star couplers, and 20 to 2
2 is an optical coupler, 23-25 is a signal transmitting/receiving device, 26-2
8 is a calculator, 29-31 is an interface, 32-3
5 is an input/output control device, 36 is a buffer memory, 37tt
Byfar memory controller 38 is a data channel.

Claims (1)

[Claims] In an aircraft-mounted digital multiplex optical coupling control device that connects a plurality of processing devices via a signal transmission line and exchanges data between these processing devices, an optical fiber is used for the signal transmission line, and each processing device an optical coupler that converts an electrical signal into an optical signal or an optical signal into an electrical signal; one transmitter that establishes synchronization and transfers data; and a number of receivers that correspond to the processing devices that exchange data; The computer is configured to simultaneously establish the synchronization and exchange data between the processing devices, and facilitate optical wavelength multiplexing by assigning a specific wavelength to each processing device to the optical signal sent to the optical fiber. An aircraft-mounted digital multiplexing optical coupling control device characterized by: