SU1405066A2 - Device for interfacing n sensors with computer - Google Patents

Abstract

The invention relates to automation and computing, in particular, to devices that perform the tasks of interfacing sensors of discrete information with data processing devices or computers. The purpose of the invention is to increase the reliability of the input information. Achieving the goal is achieved by ensuring synchronization of the input of information into the computer by introducing into the device two triggers, an OR element, an AND element, and a group of NOT elements. 1 il.

Description

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The invention relates to automation and computing, in particular, to devices that perform the tasks of interfacing discrete information sensors with data processing devices or computers, and is an improvement to the device by author. No. 1327114,

The purpose of the invention is to increase the reliability of the input information.

The drawing shows a functional diagram of the device.

The device contains the first 1 and second 2 registers, block 3 comparison, the generator 4 pulses, the first 5 and second 6 encoders, the group of elements And 7, the group of adders 8e group of elements NOT 9, the element OR 10, the first 11 and second 12 triggers, the element And 13, entrances and exits.

The device works as follows.

From the sensors, the inputs of the register 1 are given the status signals of the sensors, which are inaccessible, respectively. At the bits of the register 1, the outputs of which show the signals "In the bits of the register 2, the previous states of the sensors are recorded,

From the outputs of the first 1 and second 2 registers, signals are fed to the inputs of the comparison unit 3. If identical signals are present at the same inputs of the comparison unit 3 (the state of the sensors has not changed) j, then a signal I is formed at the corresponding output of the comparison unit 3, if different, then the signal

Consider the operation of the device on the example of changing the state of the i-ro sensor,

In the initial state, all outputs of the comparison unit 3 are present

signals 1, at the inputs elements OR 10 - signals. triggers 11 and 12 are in the zero (source) state. When the state of the i-ro sensor changes, a signal O appears at the output of comparison unit 3 and a signal i at the iM input of the PChI element 10 "The signal from the output of the element OR 10 sets the trigger 11 to the one state, and the signal 1 from the output of this trigger arrives at the output of the device in the computer, signaling the availability of information that feeds the input

At. readiness to record information

EV.on input 17 generates a signal that

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ry sets trigger 12 to state 1. The signal from trigger 12, the element 13j passed and goes to generator 4 and starts it. The generator 4 begins the formation of clock pulses at the input of the first element And 7 groups.

Since the first inputs of all AND elements of the 7th group, except for i-ro, have signals 1, then the outputs of all AND elements from the first to (il) -ro form signals, 1, and the outputs of the AND elements from the 1st to p-th - signals O.

Since the second inputs and outputs of all elements of the 7th group, except for i-ro, have the same signals, then on the outputs of all but i-ro, adders 8, the signal O is present, and the output of i-ro is signal 1. This signal goes to The inputs are first 5 and the second 6 encoders, which form the machine code of the sensor address and its state.

At the end of the clock pulse, a negative differential is recorded in the i-th cell of register 2 of the new sensor state, with the result that a signal appears at its i-th output. If none of the sensors work, then when the next clock pulse arrives from the generator 4 signal I appears at the output of the nth element of the 7th group. This signal sets the triggers 11 and 12 to the initial state. Generator 4 stops, and the ready signal stops flowing to the computer, indicating that the end of the polling cycle. The device returns to its original state.

Claims (1)

f Formula of the invention Device dd interface p sensors with a computer, No. 13271145 characterized in that, in order to increase the reliability of the DIMA information5, two triggers are entered into it, the element ID, the element OR, and the elements NOT the element inputs OR are connected through the elements NOT to the outputs of the comparison unit, the output the OR element is connected to the installation input of the first, trigger, the output of which is connected to the first input of the AND element, and is the device ready output, the installation input of the second trigger is the second trigger is connected to the second input element And, the output of which is connected to the generator start input The second trigger is connected to the output of the last element of the AND group.