SU321033A1 - ALL-UNION RDTE'SHO-TEHNM'YOKD ^; ^ - Google Patents

Description

The invention relates to devices for transmitting information between a master and several slave nodes. The aim of the invention is to provide a synchronous mode of operation without significantly increasing the redundancy of the service location. This goal is achieved by the fact that in the proposed device (subweave device, final nodes, modulators and demodulators are sequentially interconnected to form a closed loop, and the terminal nodes have a switching unit equipped with input and output with a choice of three positions depending on various types combinations of impulses received in the counter. Fig. 1 is a block diagram illustrating the closed loop of the data transmission system; Fig. 2 is a block diagram of the switching node in the transmission system. Apparatuses 1-4 are interconnected and connected to the main impulse apparatus 5 via modulator-demodulator nodes 6-15 and transmission lines 16. These modulator-demodulator nodes operate in such a way that modulators 5, 9, 11, 13 and 15 receive pulses at the same rate as the pulses are transmitted from the output of the associated demodulators 7, 8, 10, 12, 14, respectively. The modulator 6 of the main pulsed device 5 is connected to the demodulator 8 through a portion of the transmission line 16 The pulse output of the demodulator 5 is connected to a pulse input mode. Street 9 through a number of switching nodes 17. Each switching node 17 is connected to a pulse device that must be connected to the main pulse device 5. Each pulse device 1 and switching node 17 form a slave end node 18. The modulator 9 is connected to a demodulator 10 connected in series with a group of slave nodes; another portion of transmission line 16. A demodulator 10 is connected to a modulator 11 via switching nodes 17, each of which with a pulse device forms slave windows enny U9 node. The system may include an arbitrary number of groups of subordinate end nodes, modulator-demodulator and switching nodes. FIG. 1, the system is terminated by a modulator / 5, which is connected to the demodulator 7 on the main impulse device. closure, counter 21 pulses and decoding node 22. In position and ipayplyuchatel kotortoko closed. In the field, and b, the output of the switch is connected to the input of the switching node via counter 2, whose performance is equal to the number of characters forming one unit of information. In position to the output of the switch, it is connected directly to the associated pulse device. The counter 21, which is permanently connected to the input of the switching node, is also connected to the decoding node 22, which identifies certain combinations of pulses in the counter 2 /. The system has three working positions: idle position; the position in which information is transmitted from the pulse devices / -4 to the main pulse device; the position in which information can be transmitted from the main impulse device to impulse devices / -4. In the idle position, the switching nodes 17 are short-circuited, and the main impulse unit 5 transmits a continuous stream of combinations of pulses, each of which contains a combination of L pulses. Since all switching nodes 17 are short-circuited, the pulse output of each demodulator is connected directly to the pulse input of the associated modulator. A stream of combinations of pulses, non-predetermined by the pulse apparatus 5, is regenerated at each modulator-demodulator node and returns to the pulse apparatus 5 via demodulator 7. This stream of pulse combinations is intended to establish the synchronism of the oscillator of the demodulator and the oscillator of the previous modulator (for example, demodulator 10 and modulator 9); as well as the synchronism of the pulses transmitted as a combination of .. „,.„., pulses by apparatus 5, and pulses detected in the form (Combinations of I1 pulses by a counter 21. In the case where the combinations of pulses received by apparatus 5 through the demodulator 7, contain The combination of pulses, like the combinations transmitted from apparatus 5, the internal system becomes synchronized. Another way to synchronize the demodulator and the previous modulator is to maintain a two-channel connection between them. For this, each demodulator is connected to a modulator serving it, which transmits pulses to an auxiliary demodulator that connects to the previous modulator in the system, is in. In this way, it is determined by signaling whether synchronization between the modulator-demodulator connections is maintained and then 01NB A. The overlap of combinations B and C is the following. After identifying the combination B of pulses in counter 2 by decoding node 22, if the associated pulse device has information to transmit, key 20 is set to field voltage used in the accumulated counter 2} pulse sequence combinations is checked, is not whether this combination is the combination of C. With the combination, the key is set to position B, the combination of which are passed only transmitted from an associated pulsed apparatus. Thus, pre / 1, the combination C advances to the next serial end node in the serial circuit. As a consequence, the subsequent counter 21 will not receive the combination C immediately after the combination B, and the key 20 associated with it is set to the inoperative position. If the end node has no information to transmit at the time when the combination b is detected in the pulse counter 21. key 20 saves the idle position. The information transmitted from each pulse device passes through successive switching nodes in the series circuit to the input of the main pulse device 5. Each pulse device finishes the transmission of combinations of pulses B and C, and then the switch 20 is set to the off position. After this, the sequence of the described processes is repeated in subsequent switching nodes. When combinations B and C are received in the main impulse unit 5, this means that the Bice impulse units IB saiMKHyTOiM of the circuit transmitted information. The impulse machine .... b starts transmitting the combi atsi and D pulses, therefore, the information from the slave end node is received properly obipaaoM. With infi p: maci, the resulting impulse machine 5,10odde \ rzhit errors, combinations B and C will be transmitted again, and the described process is repeated. Thus, the pulse devices that transmitted information, but did not receive the D combination, will transmit their information again. The transmission of information from the main impulse apparatus to any one of the impulse apparatuses begins with the transmission of two combinations D | and X before | each message. The combination D indicates that the next following combination X is addressed to a special impulse device. Combination X will pass through all the switching nodes 17, but only the pulse unit, indicated by the number X, will respond to this information. A switching node 17 is provided for connecting the end nodes and the main pulse apparatus in series. The subject matter of the invention is a device for transmitting command adpuls in a data transmission system between a main node and one or several remote groups of subordinate terminal nodes located locally, and each of the specified groups and the main node have a modulator and a demodulator, so-called "modem," ; pulses from the main node and the Slave terminal nodes in accordance with the characteristics of the communication link connecting the main node with the terminal nodes of the MMI, characterized in that, in order to ensure synchronous operation No significant increase in the redundancy of service signals, the slave end nodes and modulators and demodulators are sequentially interconnected to form a closed loop between the data output and the data input of the main node with the transmission of command, address and information pulse patterns, while in a closed loop the output of the modulator of the main node is connected to the input of the first demodulator in the circuit connected to the first: r, the minor subordinate terminal nodes, connected in series and the pattern those who have closed loop between the output of the first 10

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the modulator and the input of the associated modulator, the output of which is connected to the input of the subsequent second demodulator in the series circuit, connected in turn with the second group of slave end nodes, etc., until finally the last modulator in the circuit, it will not be connected by its output to the input of the demodulator of the main node, thereby closing the circuit.

2. The device according to claim 1, characterized in that the slave end nodes have a switching unit equipped with input and output with a choice of three positions, depending on various types of pulse combinations received in the pulse counter and detected at the decoding node than the first position the switching point corresponds to a short-circuited circuit between the input and output of the switching unit, the second position of the switch is the connection of the input and output of the switching cell through a pulse counter, and T1 to the third position of the switch - connection of the input of the switching unit with the impulse device present in each slave terminal node.

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