SU627472A1 - Interface - Google Patents

Description

The invention relates to the field of digital computing technology and can be used for input-output information in digital computing and digital systems.

Systems are known that are used when subscribers work with a computer through channels for interfacing multiple terminals in one place and an evenly-computing machine (; LM) located in another place at a considerable distance from SdZ subscribers.

In such systems, the exchange of information of the VM is conducted by formalized information. When exchanging non-formalized messages between subscribers and computers, in the dialogue mode the volume of the buffer memory of the device becomes uncertain and cannot change flexibly, p. This is the lack of known systems.

The closest technical solution to the proposed is a mating device containing a follower

but connected a receiving register, a computer communication unit connected to a reception synchronization unit, a transmission synchronization unit and an address setting unit, an address fixing unit connected to the receiving register; the transmitting register connected to the communication unit with a computer, and the communication unit with data transmission equipment connected to the receiving register, unit, reception synchronization and transmission synchronization unit 2 | .

The drawbacks of the device are the complexity of data exchange, limited functionality and the impossibility of exchanging non-formalized messages in a dialogue mode.

The purpose of the invention. The expansion of the scope of the device by exchanging messages in a dialogue mode.

In order to realize this goal, an address maker connected to a communication unit with a computer and to a sending register and serially connected address allocation unit and a state byte allocation unit connected to the receiving register and to the communication unit with a computer are entered into the device. . The structural scheme of the proposed device is shown in the drawing. The device contains a computer communication unit 1, an address setting unit 2, a status byte allocating unit 3, an address fixing unit 4, an address allocating unit 5, an address generator 6, a reception synchronization unit 7, a receiving register 8 transmitting register 9, a block 1O transmission synchronization and block 11 communicate with data transmission equipment. The device works in the following way. The start of operation is initiated by the transmission via the computer I / O channel in the communication unit 1 with the computer of the address of the desired terminal. In this case, the older three bits of agfes are compared in a communication unit with a computer with a / fes installed in block 2 of the tasks of a / fes. When compared, the initial sample signal is transmitted to a lower priority external device. When comparing, the interface device logically connects to the interface, the address for control is issued to the computer from block 2, in response the computer sends a command for execution. If the device is healthy, block 1 generates a zero byte of state and sends it to the computer. Upon the command Record, received in block 1, the command line {Would be fixed in the corresponding area of block 4 of the fixation of addresses intended for the placement of control. l yushey information. A new address mapper with an address for transmission to a communication channel, which will consist of an address indication, a command indication, and five minor bits defining the address of the terminal at the other end of the communication channel. The address generated by the shaper 6 is rewritten to initial deductions of register 9 and in conjunction with the synchroeerology of their signals produced by block 1 of this transmission, is sent to the data transmission equipment, and the command from block 1 is rewritten into n by editing the register 9 and through block 11 is sent to data transmission equipment. In parallel, unit 1 continues to receive a data byte of the data by the computer I / O channel. The address shaper 6 again generates the terminal with the information sign and sends it to the data transmission equipment via the transmitting register 9. Received from the channel to the block 1 data byte is fed to the transmitting register 9 and then also to the communication channel. The Read command, the received 3QfA is sent over the communication channel to the terminal, in the same way as the Write command. Learned from the activated terminal through the communication channel and block 11 to receive, register 8 information is analyzed by address allocation block 5 (loan synchronization on receiving information to receiving register 8 is performed by block 7). When an address sign is detected in the received byte register 8 byte, the five least significant bits of the address byte are sent to computer unit 1, where the remaining bits are recovered by code taken from address unit 2. Next, the address byte from the receive register 8 is sent to the state byte separation unit 3 to extract information attributes to determine the information that follows the address. The receive register 8 is freed for the next byte reception. After the make-up on the register of the next bay, unit 1 issues a signal to the subscriber's Requirement for service to the computer. According to the sequence of sampling signals, block 1 provides the computer first with the address of the requesting service of the terminal, and then the byte located on the receiving register 8. The corresponding identification signal {Data or Status Byte) is generated at the output of the status byte allocator 3 and through the block 1 is transmitted to the channel. In this case, the services of the receiving (reading) subchannel of the VM are higher than the transmitting (writing). In the absence of information in the receiving communication channel, the address fixing unit 4 is accessed in order to determine whether the block has a sign that a terminal is performing a Record operation. The feature of the operating terminal is retrieved from the black box 4 and the address is given in block 1. Then a service request is made; The computer selects the address of this terminal in the order of priorities, sends to the block 1 byte of data, which, according to the algorithm described above, together with the address is transmitted to the data transmission equipment. The use in the device for co-operation of additionally entered blocks of an address generation block, a block of state bytes and an address spacing block allows one to expand the functionality, for example, to use one channel of communication to other subscribers in a multiplexed mode. This is achieved without reworking the mathematical software developed for servicing the terminals located in direct