SU523428A1 - Device for reading information - Google Patents

Description

6 and to the input of shift register 3. However, the absence of an enable signal from the control unit does not allow writing information coming from sensor unit 1 to shift register 3. The occurrence of the unit in the last bit of the ring shift register 2 signals the block of the end of the next polling cycle of the sensor unit 1. The control unit has output the enable signal of the poll cycle entering the shift register 3. The information is stored and shifted in shift register 3 for at least two polling cycles. During the first cycle, the previous information is pushed out of the shift register 3 and the record is new. At each step of polling the sensor unit 1 by comparison circuit 6, a comparison is made of the new information that is displaced from shift register 3. If the state of at least one of the sensors has changed during the polling, the comparison circuit 6 generates a mismatch signal to the control unit. Upon receiving this signal, the control unit for the signal from the last bit of the ring shift register will generate a reset reset pulse for trigger 9 and will monitor the next polling cycle. If the same information is recorded twice in the shift register 3 (or as many times as provided by the control unit), the comparison circuit 6 does not generate an inconsistency signal and the control unit removes the enable signal from the input of the shift register 3 and the circuit Comparison 6. The information recorded in the shift register 3 and the check bit generated on the trngger 9 are processed in the control unit according to a predetermined program. The delay element 5 delays the clock pulse arriving at the shift register 3, the comparison circuit 6, the AND-HE circuit 7 and the 2ID-HE circuit, 8 and eliminates the false triggering of these elements due to the delay in the information received from the sensor unit 1 and ring shift register 2.

The applied control method in the process of code generation, implemented in the device with the help of specially connected ones

elements, the use of one shaper for all sensors, as well as the formation of a check bit, make it possible to more reliably read information from sensors in the conditions of interference.

The usefulness of the invention is expressed in qualitative terms, such as increasing the accuracy of readable information under interference conditions.

Claims (2)

Invention Formula A device for reading information comprising a sensor unit connected to a shift register and a clock pulse generator, characterized in that, in order to increase the reliability of the device, it contains a delay element, a comparison circuit, a trigger and a series-connected element 2I-NOT, a ring shift register and the element I-NOT, the output of which is connected to the installation input of the ring shift register, and one of the inputs of the element "I-NO connected to the other input of the element 2I-NOT, with the counting input of the shift register, with the comparison circuit and the output of the delay element The input of which is connected to the clock pulse generator and to the clock input of the ring shift register, the other input of which is connected to the second input of the element “2И-НЕ,” with one of the outputs of this register and with one of the inputs of the sensor unit, the other inputs of which connect directly to the outputs of the annular shift register; one of the outputs of the sensor unit is connected to the comparison circuit, and the other is connected to the secondary circuit and to one of the inputs of the shift register, one of the outputs of which is connected to the comparison circuit, and the other to the comparison circuit and trigger Sources of information taken into account during the examination: I. Auth. St., USSR, № i257163, class. G 06К 7/08, 07.04.67. 2. Auth. Sv., USSR, № 374588, class. G 06F 3/04, dated 05.23.70.