SU1566484A1 - Converter of serial binary code to bidirectional signal - Google Patents

Abstract

The invention relates to computing technology, in particular, to devices for transmitting discrete information, and can be used to interface communication channels with a computer. The invention allows to increase the speed of the converter. Serial binary code converter to bipolar signal contains pulse generator 1, triggers 2 and 11, transmitting register 3, inverter 4, linear transformer 5, first and second limiting elements 6 and 7, first and second key elements 8 and 9, matching element 10 , elements And 12 and 13, elements 2I-2I-OR-NOT 14 and 15. 2 ill.

Description

The invention relates to computing, and in particular to devices for transmitting discrete information and can be used when pairing a computer with communication channels.

The aim of the invention is to increase the speed of the Converter.

In FIG. 1 shows a block diagram of a converter; in FIG. 2 is a timing diagram explaining its operation.

The serial binary COD to bipolar signal converter contains a pulse generator 1, a first trigger 2, a transmit register 3, an inverter 4, a linear transformer 5, the first 6 and second 7 limiting elements, the first 8 and second 9 key elements, the matching element 10, the second trigger 11, the first 12 and second 13 element AND, the first 14 and second 15 elements 2I-2I-OR-NOT. In addition, in FIG. 1 shows the information 16 and control 17 inputs of the Converter, the potential input 18 of the Converter and the bus 19 of zero potential, as well as the output 20 of the Converter.

In the diagrams (figure 2) a is the signal at the input 17; b - signal at the output of the generator 1; c, d - signals at the direct outputs of triggers 2 and 1 1; d, e - signals at the outputs of the elements 12 and 13; g, s - turn-on signals of key elements 8 and 9; and - the signal at the output 20.

The converter of the serial binary code into a bipolar signal operates as follows.

A three-level code is presented in the communication line, represented by positive and negative pulses and the absence of a signal. A single bit of information in the communication line corresponds to signal 1 on the time diagram, the zero bit - signal 'Ό'. Before starting work, the signal at input 1 7 is in a low state logical level (Log. 0).

After parallel loading of the transmitting register 3 from the transmission path by the next code message, the trigger signal at input 17 is transferred to a high logic level (Log.'Ch) and generates signals at the outputs of elements 12 and 13 along the edges of the clock pulses from the generator 1. The peak of formation of these signals is four periods T _{about the} frequency of the generator 1. The first two periods corresponding to the code states of 10 triggers 2 and 11, respectively, are allocated for the formation of pulse signals in the communication line. The second two measures 01 and 00 are reserved for the formation of a pause (absence of signals) in the communication line. The shift of information in the transmit register 3 is carried out by cutting the signal corresponding to the code state of 11 triggers 2 and 11. Information signals from the output of the serial shift of the transmit register 3 and the output of the inverter 4 through the elements 2I-2I-OR-NOT 14 and 15 carry out signal switching to the inputs of key elements 8 and 9.

If there is a logical 1 signal at the output of the transmitting register 3, the on-off signal of the key element 8, represented by a low level, is first generated, and then the on-off signal of the key element 9, represented by a low level, is formed High level means opening the corresponding key element 8 or 9.

I

If there is a signal of a logic 0 at the output of the transmitting register 3, the turn-on signal of the key element 9 is formed first, and then the key element 8 is formed. When the key element 8 is closed in the secondary winding of the linear dance transformer 5, a pulse of positive polarity is generated. When this current flows from the input 18 through the matching element 10 (resistor), the primary winding of the transformer 5 and the closed key element 8 to the bus 19.

When the key element | 9 is closed in the secondary winding of the transformer 5, a pulse of negative polarity is similarly formed. The limiting elements (diodes) 6 and 7 protect the key elements from voltage surges at the moment of opening the key elements 8 and 9. The emissions are due to the inductive nature of the load of the key elements 8 and 9. The matching element 10 ensures that the output impedance of the converter matches the wave impedance of the communication line and with the coefficient transformation equal to 1: 1 should be equal to the wave impedance of the communication line. Removing the output signal means the end of the transmission of the code message.

When converting information into a bipolar signal (Fig. 2), the single and zero bits are transmitted to the communication line as a sequence of signals of positive and negative polarity. This eliminates the need for synchronous operation of generators located at the receiving and transmitting ends of the communication line. Thus, the proposed converter has no restrictions on the length of the code message, and the information transfer rate is limited only by the parameters of the used communication line.

Claims (1)

Claim A serial binary code to bipolar signal converter comprising a pulse generator, the output of which is connected to the C-input of the first trigger, a transmitting register, the output of which is connected to the inverter input, a linear transformer, the first and second conclusions of the primary winding of which are connected to the corresponding first conclusions of the limiting elements and with the first conclusions of the key elements, the second conclusions of which are combined and connected to the bus of zero potential, the second conclusions of the limiting elements are combined with the first The output terminal of the matching element is the potential input of the converter, the second terminal of the matching element is connected to the third terminal of the primary winding of the linear transformer, the terminals of the secondary winding of which are the output of the converter, the information inputs of the transmitting device are the information input of the converter, characterized in that, in order to increase the speed of the converter, the second trigger, the And elements, and the 2I-2I-OR-NOT elements, the outputs of which are connected to the third conclusions, are introduced into it bottom 15 of the nominal key elements, the direct output of the first trigger is connected to the D input of the second trigger and the first inputs of the first and second elements AND, the output of the first element And is connected 20 to the first inputs of the first and second elements 2I-2I-OR-NOT, the output of the second element And is connected with the second inputs of the first and second elements 2I-2I-OR-NOT and with the sync input of the transmitting register, the inverter output is connected to the third inputs of the first and second elements 2I-2I-OR-NOT, the fourth inputs of which are connected to the output of the transmitting register, direct output WTO of the second trigger is connected to the second input of the second element And, the inverse output of the second trigger is connected to the second input of the first element And with the D-input of the first trigger, C-input 35 of the second trigger is connected to the output of the pulse generator, the R-input of the first trigger is combined with R- the input of the second trigger and is the control input of the Converter.