SU1282180A1 - Information transmission device - Google Patents

Abstract

The invention relates to the field of automation and computer technology and can be used to transmit information in data collection systems from a large number of sources over a single communication channel. The purpose of the invention is to increase the reliability of the device. When generating a transmission request signal, when the communication channel is free, the device generates a busy signal. If there are no signals from other devices in the communication channel, then after a certain time the device transmits information to the communication channel. If busy signals appear in two or more devices at the same time, the one that has the largest duration of the busy signal gets the permission to transmit information. The duration of this signal is chosen to be multiple to a specific time and has a different value for all devices. 4 il. SL

Description

ke and computer technology and can be used to transmit information in systems for collecting information from a large number of sources over a single communication channel.

The purpose of the invention is to increase the reliability of the device.

FIG. 1 shows the structure of the information collection system; in fig. 2 - functional device diagram; in fig. 3 and 4 - information storage unit.

The system contains dispatch point 1, communication channel 2, devices 3 for transmitting information, sources 4 information.

The device comprises an information storage unit 5, a delay unit 6, an AND 7 element, an OR 8 element, a linear one, a 9 block, an AND 10 element, a blocks 11 and 12; delay, trigger 13, key 14, generator 15, inverter 16, bus 17-25.

The information storage unit 5 of the first and the last variant (Fig. 3) consists of the element AND 26, the shift register 27.

for a time o, after which the signal from the output of the block 12 is reset. The signal from the output of the block 13 through the element OR 8 goes to

element And 28 and counter. 29. Block 5

according to the second variant (fig. 4) consists, „linear block 9 and translates

from the register 30 shift, the element And 31, prprp ii. PMPNR

its in transfer mode. At the same time, the key 14 is unlocked and the frequency package is delivered to block 9. As a result, an occupancy signal of duration o is transmitted to communication channel 2. After 35 resetting the flip-flop 13, the key 14 is locked, the signal on the bus 20 resets and the block 9 switches to the receive mode. If there is no sig in channel 2

reversible counter 32, trigger 33 and element And 34.

Blocks 6, 11 and 12 hold the leading edge of the signals for a set time. The falling edges of the input and output signals are the same ....

equal to

. ()

uh: i)

+ 1

The device works as follows.

In the initial state, block 5 is free; block 9 operates in the receive mode. Block 5 signals the bus 25 informs source 4 about the readiness to receive information. The source 4 sends information to the bus 23 and accompanies it with a signal on the bus 24. When block 5 is filled with information, it removes the reception readiness signal on the bus 25 and issues a transfer request to the bus 19. If at this moment communication channel 2 is free, then there is no signal at the output of the linear unit 9 and unit 6 allows the transmission request to pass through the element 10. This signal sets the trigger 13 to one state. In this state he remains

over a period of time o ', after which it is reset by the signal from the output of block 12. The signal from the output of block 13 through the element OR 8 goes to

 linear block 9 and translates

   prprp ii. PMPNR

its in transfer mode. At the same time, the key 14 is unlocked and in frequency 9 the frequency sending arrives. As a result, a busy signal of duration o is transmitted to communication channel 2. After resetting the flip-flop 13, the key 14 is locked, the signal on the bus 20 is reset, and the block 9 switches to the receive mode. If there is no signal in channel 2 ..

Since other devices are 3 and the delay of the 6-S block is set; 40 dark interferences are set, then after the time is longer than the maximum reset time of the trigger 13 at the output of the block 11

A signal appears where the AND element 7 generates an information transmission permission signal. Information on

pauses between the pulses of the transmitted pulse sequences and for all devices 3 in the same way, the delay time of the block 12, is set 45, the bus 17 is fed to the input of the block 9

equal

+ 1)

,

(i)

+.

T

 and

.

+ t

R

device number;

the switching time of the linear unit 9 from the transmission mode to the reception mode;

the period of the pulse generator 15; the propagation time of the channel over the communication channel 2.

and transmitted to link channel 2. When block 5 is released, it clears the transfer request over bus 19 and device 3 returns to its initial state.

If a request to transfer information to a free channel 2 appears in two or more devices simultaneously or during the time tnp / nep tp, then each of them begins to transmit a busy signal. Permission to transfer information gets something from. of these devices which has the most

the larger value is ss, let it be a device with 1 ton. The remaining devices, having finished transmitting the entire busy signal, fix the channel occupancy with a 2 m unit and transfer the standby mode. After the transmission of the ready signal of the t-th device 3 is completed, they also cannot start the transfer, since the th-th device begins to transmit information after time T

other devices record the release of channel 2 through time C,.

All devices 3 that did not gain access to channel 2, as well as devices in which there were requests for information transfer while the t-e device transmits information, wait for the release of channel 2. After a time C, after the t-e device has completed the transmission, block 6 of each of these devices, outputs the signal over which the busy signal is generated and transmitted to channel 2. Permission to transfer is received by the device with the highest E h.,

This eliminates the possibility of simultaneous transmission of information by several subscribers in the event of their simultaneous readiness for transmission to a free communication channel due to the fact that always transmission of information is preceded by transmission of an busy signal.

five

0

50

1804

Claims (1)

Invention Formula A device for transmitting information containing the first delay unit, the information storage unit, the first output of which is connected to the first input of the linear unit, the second input of which is connected to the key output, the second delay unit, the output of which is connected to the first input of the first And element, the input of the third block the delay is connected to the first input of the trigger, the output of which is connected to the first input of the key, to the second input of which is connected to the output of the generator, about t - l and. In order to increase the reliability of the device, OR elements, an inverter and a second AND element, the second output of the information storage unit are connected to the first input of the second AND element and the second input of the first AND element, the output of which is connected to the first inputs of the information storage unit and the OR element, the output of which is connected to the third input of the linear unit, the output of which is connected through a serially connected inverter and the first delay unit to the second input of the element L unit whose output is connected to odes second and third. iblokov delay, and with the second input of the trigger, the output of which is connected to the second input of the element OR. FiL j S Editor N. Bobkova Compiled by M. Artamonov Tekhred L. Oliynik Proofreader E. Sirohman Order. 7272/50 Circulation 542 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 fkg f . Subscription