JPH035701B2 - - Google Patents

Description

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

In recent years, the digitalization of aircraft onboard systems has progressed, and with the computerization of cockpits, the installation of digital processing devices has become essential. The application of ACT (Active Control Technology), which has been a hot topic recently, is also thought to be based on the use of digital computers with high processing power.

When installing a control device, high reliability is an important issue, and one solution to this problem is multiplexing the devices as shown in FIG. When using a multiplex system, data exchange is required to synchronize each channel and to compare data. In actual systems, synchronization and data exchange are often performed between the digital calculation section 2 that processes the output from the sensor section 1 and the actuator drive section 3 at the next stage. Note that 4 indicates a servo actuator. In particular, data exchange between the digital arithmetic unit 2 is important. Conventionally, in multiplex control devices, especially multiplex control devices that require real-time processing, transmission lines for establishing synchronization between each processing device and signal transmission lines for data exchange are often provided separately, and Each processing device was connected in a loop using the same bus line. Therefore, synchronization establishment and data exchange have to be configured using separate hardware, which has the disadvantage of complicating the hardware configuration and increasing the number of programs on the computer side. Furthermore, since the data transfer is a loop-like connection, it is necessary to wait for the transfer between two points to complete before transferring data between the next two points, and it takes a long time to complete all data exchange. It also had the disadvantage of being necessary.

In this invention, an optical fiber is used as a signal transmission line, and each device has one transmitter that transmits synchronization establishment signals and data transfer, and another transmitter that transmits data. It has a number of receivers corresponding to the number of receivers, and synchronization establishment and data exchange between each device are performed simultaneously between the processing devices, and when the signals are integrated into one optical fiber, the optical signal is transmitted separately for each device. An object of the present invention is to provide an aircraft-mounted digital multiplexing optical coupling control device that can reduce the number of signal transmission lines and electrically isolate each device by allocating specific wavelengths. This invention will be explained below with reference to the drawings.

FIG. 2a is a block diagram of an aircraft-mounted digital multiplexing optical coupling control device which is an embodiment of the present invention. In the figure, numerals 11, 12, and 13 are processing devices, and in this embodiment, a triple system is assumed as a multiplex system, so there are three processing devices. 1
4, 15, and 16 are optical fibers that connect the processing devices 11 to 13, and 17, 18, and 19 are T couplers or star couplers (hereinafter simply referred to as couplers) that connect the optical fibers 14, 15, and 16. be. FIG. 2a shows a case where the optical fibers 14, 15, 16 are provided separately, and when a single optical fiber is used, they are coupled with a T coupler as shown in FIG. 2b, and each processing device 11, 12, 13 The wavelength of the optical signal from
F ₁ , f ₂ , and f ₃ are separated, and the optical/electrical converter O/E on the receiving side is equipped with an optical filter that receives only the corresponding wavelength, and only the desired signal is extracted. Each processing device 11 to 13 includes one electric/optical converter E/O and two
Optical couplers 20 to 22 composed of one optical/electrical converter O/E, and signal transmitting/receiving devices 23 to 25 composed of one transmitter TX and two receivers RX ₁ and RX ₂ . and computers (CPU) 26-28,
These computers 26 to 28 and the signal transmitting/receiving device 23
Interfaces 29-31 connecting between ~25
has. The transmitter TX of the processing device 11 includes an electrical/optical converter E/O, an optical fiber 14, a coupler 17,
It is connected to the receiver RX ₁ of the processing device 12 and the receiver RX ₂ of the processing device 13 via the optical/electrical converter O/E. Similarly, the transmitter TX of the processing device 12 also includes an electrical/optical converter E/O, an optical fiber 15, a coupler 18,
It is connected to the receiver RX ₂ of the processing device 11 and the receiver RX ₁ of the processing device 13 via the optical/electrical converter O/E. The transmitter TX of the processing device 13 is connected to the receiver of the processing device 11 via the electrical/optical converter E/O, the optical fiber 16, the coupler 19, and the optical/electrical converter O/E.
RX ₁ is connected to receiver RX ₂ of processing unit 12 .

FIG. 3 is a block diagram showing an interface connecting the signal transmitting/receiving device 23 of the processing device 11 and the computer 26, in which 32 to 35 are input/output control devices;
6 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 to the computer 26 and the receiver RX ₁ ,
Used to store received data received by RX ₂ . In order for the computer 26 to use this data, it must be 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 the local memory. The interface between the computer 26 and the signal transmitting/receiving device 23 also includes processing devices 12 and 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.

FIGS. 4a and 4b are diagrams showing the format of a signal word; FIG. 4a is a command word format, and FIG. 4b is a data word format. transmission rate
The speed is 10MBPS, 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 bit is parity,
The remaining 16 bits are information. In the case of a data word, 16-bit data is entered here, but in the case of a command word, the function, receiving station, and receiving memory area can be specified.

In the above embodiment, the synchronization signal and data are sent from one transmitter TX, which is transmitted from the computer 26.
It is distinguished by ~28 commands.

In order to synchronize the processing units 11 to 13, each computer 26 to 28 uses the function in the command word of FIG.
A command is issued to the 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 E/O of the optical coupler 20. The receiving side is
If the first 3 bits are found to be a command word, the function is checked, and in the case of synchronization, an interrupt is immediately sent to 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. transmitter tx
first sends a data start command, then the specified data, and finally 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 computer 26~
28 to notify completion of data reception. Processing device 11
~13 has two receivers RX ₁ and RX ₂ , and in order to enable simultaneous processing, the access time to the buffer memory 36 is made faster, and the receivers RX ₁ and RX ₂ , the transmitter TX, and the computer 26~ 28 accesses are 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.

As explained above, the first invention of the aircraft-mounted digital multiplexing optical coupling control device according to the present invention uses an optical fiber as a signal transmission path, and each processing device converts an electrical signal into an optical signal or an optical signal into an electrical signal. It consists of an optical coupler that converts into signals, one transmitter that transfers synchronization establishment signals and data, a number of receivers that correspond to the number of signals from other processing devices, and a computer, so each processing device It is possible to simultaneously establish synchronization and exchange data between the respective devices, and furthermore, it is possible to achieve electrical isolation between the respective processing devices.

Similarly, in the second invention, in the first invention, a specific wavelength is assigned to each processing device to perform optical wavelength multiplexing on the optical signal sent to the optical fiber, so that only one signal transmission line is required. It has many excellent effects, such as improving the processing efficiency of synchronization processing and data conversion, enabling simultaneous transmission and reception processing, and electrically insulating each processing device.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a standard multiplex configuration, Figures 2a and b are block diagrams showing embodiments of the invention, Figure 3 is a block diagram of a computer interface, and Figures 4a and b are signal diagrams. This is a diagram showing the word format, where a is a command word and b is a command word.
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, 20 to 22 are optical couplers, 23 to 25 are signal transmitting/receiving devices, 26 to 28 are computers, 29 31 is an interface, 32 to 35 are input/output control devices, 36 is a buffer memory, 37 is a buffer memory control device, and 38 is a data channel.

Claims (1)

[Claims] 1. An aircraft-mounted digital multiplex system in which a plurality of processing devices are connected by a signal transmission line, with the transmitters and receivers of each processing device corresponding to each other, and data exchange between these processing devices is performed. In the optical coupling control device,
An optical fiber is used as the signal transmission line, and each processing device includes an optical coupler that converts an electrical signal into an optical signal or an optical signal into an electrical signal; one transmitter that transmits a synchronization establishment signal and data transfer; An aircraft-mounted digital multiplexing optical coupling control device comprising: a number of receivers corresponding to signals from a processing device; and a computer. 2. In an aircraft-mounted digital multiplexing optical coupling control device in which a plurality of processing devices are connected by a signal transmission line with corresponding transmitters and receivers of each processing device, and data is exchanged between these processing devices. ,
An optical fiber is used as the signal transmission line, and each processing device includes an optical coupler that converts an electrical signal into an optical signal or an optical signal into an electrical signal; one transmitter that transmits a synchronization establishment signal and data transfer; It consists of a number of receivers corresponding to the signals from the processing device; a computer; An aircraft-mounted digital multiplexing optical coupling control device characterized by performing optical wavelength multiplexing by allocating wavelengths.