SU1608678A1 - Telefax to computer interface - Google Patents

Abstract

The invention relates to the field of automation and computing and can be used in automated systems for the exchange of information between computers and a facsimile machine. The aim of the invention is to increase the reliability of the exchange of information. The goal is achieved by introducing into a device containing a shift register, two flip-flops, a counter, a switch, an OR-NOT element, two NAND-elements, a pulse generator and an NOT element, two frequency dividers, three pulse drivers and a delay element. 1 il.

Description

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purpose

The stamping is related to computer technology and can be used both for input of a gradi- (two-gradation) information scanner of a facsimile computer and for output from the memory of a facsimile printer.

of the invention - enhancing the exchange of information

The drawing shows the functional diagram of the device.

The device contains pulse formers 1-3, a shift register 4, a pulse generator 5, dividers 6 and 7 o'clock, registers filling the register 8, switch 9, triggers 10 and 11, delay element 12, element OR-NOT 13, elements AND- PE 14 and 15, element 16, lines 17-23 of the outputs and inputs of the device for communication with an external device, information; the input 24 and the output 25, the control lines 26-30 of the device for communication with the computer. The device works as follows.

All processes in the device are synchronized from their own generator. There are 5 pulses, the signals of which share the frequency dividers 6 and 7 with the frequency F ,. The output of the frequency divider 6 receives a signal with the frequency of the sequence F / n, and the frequency divider 7 outputs three signals with the frequency of the frequency F / m, F / 2in. F / 4ni. The sigal from the output of the frequency divider 6 is fed to the input of the imager 2 pulses, from the output of which the fax sweep frequency of the fax apparatus is stabilized to line 18.

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At the output of switch 9, depending on the signals for setting the cHMiinbHoro mode of the device, the sweep speed and I / O (lines 20 and 21), the SI signal is allocated with the corresponding tracking frequency, which is fed to the clock input C1 of the shift register 4 and to the counting input of the counter 8, the overflow coefficient of which is sixteen (register height 4).

Thus, the stability, the scan speed of the facsimile apparatus determines the frequency stability from the output of divider 6, and the stability of the quantization frequency with respect to the time at the output of divider 7 depends on the stability of the frequency of the 5-pulse generator. Since a common generator of 5 pulses is used, at D F the ratio of these frequencies does not change.

Consequently, the number of line elements read by the facsimile scanner when entered into a computer and the number of line elements synthesized by its printer when outputting from a computer is constant and does not depend on the stability of the frequency of the 5-pulse generator. The latter is important, for example, when graphics information entered into a computer is processed for the purpose of recognition, and graphic information output requires a large geometric accuracy.

The filling signal of the counter 8 is fed to the synchronous input of the trigger 10, the output of which on this signal in line 28 fails to generate the first signal of the computer interruption request. Requirement A

From the fax machine on lines 22 and 23 to the inputs of the element AND –HE 14, the synchronization signals of the beginning (or end) of the sweep (NCR) and the end of the line of the image (CS) are sent. The signal from the output of the NAND 14 element is fed to the reset inputs of the counter 8 and the frequency divider 7, thereby resetting them to the initial state before the start of each new image line sweep. This signal is simultaneously applied to the input of the element 16 and to the synchronous input of the trigger 11 at the output of which in line 27 a second computer interrupt request signal is generated. Requirement B.

At the inputs of the element AND-NOT 15, via line 21, a mode setting signal (output) is received, a signal from the element output

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NOT 16 and on line 26 is a signal from the low-order output of shift register 4. In the presence of the first two signals, the signal from the low-bit output of the shift register 4, the passage through the element AND-NOT 15 and the imaging unit 3, enters the information input of the fax machine.

On the inputs of the element OR-NOT 13, on lines 29 and 30, the input and output signals of the computer Input and Output are received. From the output of the OR-NOT 13 element, the Input or Output signal is fed to the reset inputs of the first 10 and second 11 triggers. The input signal is also provided to the input of the delay element 12 and to the input of the write resolution of the shift register. From the output of the delay element 12, a signal is applied to the shift enable input of the shift register 4.

The input mode in the computer graphic information. The sequential video information received from the facsimile apparatus, if the NCR signal is present on line 23, is time-quantized and simultaneously entered into shift register 4.

After the shift register 4 is filled with trigger 10, a Signal A signal is generated (line 28). During the appearance on signal line 29 of the input, information from the output 25 of register 4 is entered.

The separation of the scan lines of the input image is performed according to the signal Requirement B on line 27. At the end of each input signal cycle. Requirement A and Requirement B are reset by the Input signal (line 29).

The mode of information output from the computer memory to the fax printer. If there is a signal on line 23 Start of a sweep on a signal in line 28 Requirement A in line 30 produces a signal Output, during the passage of which information from the computer is recorded in register 4 - shift. The information recorded in shift register 4 is sequentially outputted via line 26 to input 17 of the printer of the fax machine.

The beginning of each output line is determined by the signal Requirement B. At the end of each output cycle, the signals of Requirement A and Requirement B are reset by the Output signal.

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A device for interfacing a computer with a fax machine, containing a shift register, information inputs and input of a parallel code of which are the first information input and output of the device, two triggers, the reset inputs of which are connected to the input of the OR-NOT element, switch, output connected to the clock input 1 the shift register, the two IS-NOT elements, the pulse generator, the NO element and the counter, the reset input of which is connected to the output of the first AND-NOT element, the first input of which is the sync input of the device computer, which means that, in order to increase the reliability of the information exchange, the device has three forms of pulse, a delay element i two frequency dividers, and I for example

The serial input of: the shift register is connected to the first pulse shaper with the device's input from the facile device, the output of the pulse generation is connected to the clock input of the first frequency divider, the first and second outputs of which are connected respectively to the input of the second pulse forwarder and clock input of the second frequency divider, a group of outputs connected to the group of information inputs of the switch.

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the output of which is connected to the counting input of the counter, the output connected to the synchronous input of the first trigger, the synchronous input of the second trigger connected to the output of the first AND-NOT element, the reset input of the second frequency divider and through the element NOT to the first input of the second AND-NOT element, the second input connected to the output of the lower bit of the shift register, and the output through the third pulse shaper with the information output of the device to the facsimile machine, the third input of the second AND-NOT element is connected to the first address input of the switch and the first input of the device mode setting, the second address input of the switch is the second input of the device mode setting, the output of the second pulse shaper and the second input of the first NAND element are respectively the output syn. the synchronization and the synchronization input of the device sweep from the computer, the outputs of the first and second triggers are the corresponding outputs of the interrupt requests to the facsimile device of the device, the setup input of the shift register is the input of the synchronization of the device computer and connected to the first input of the CL1-HE element and through the delay element, with the shift register sync input, the second input of the OR element is NO input sync input from the fax machine of the device.

Claims (1)

U, fax: reg 'and the parallel code output of which I VL I! home: Hera :: vy, to the input of the shift register, two elements of the N-NOT ment and the line of the device from the computer and to increase the reliability of the exchange of information of the pulse world, delay element in: two frequency dividers formational input of the serial code of the shift register the torso is connected through the information input of the device from the facsimile apparatus to the input of the first frequency divider, the first segment, respectively, to the input of the second pulse shaper and the clock input of the second frequency divider, the group are the first information inputs the output of the device, two triggers, the reset inputs of which are connected by the OR-HE element, switching the output connected to the clock, a pulse generator, eleNE and a counter, the reset input is connected to the output of the first ele- ment NAND, the first input of which was the end synchronization input, Furthermore, in order to introduce three handicaps into the device, the first pulse shaper с, the output of the general pulses connected to the clock and the second outputs of which are sub-outputs of the information inputs of the switch connected to the group • of outputs, the output of which is connected to about the counter counter input, the output of the first trigger connected to the sync input, the second trigger sync input 5 is single with the output of the first AND-NOT element, the reset input of the second frequency divider and through the NOT element with the first input of the second AND-NOT element, the second input connected to the low-order shift register output, and the output through the third pulse shaper with the device information output - to the fax machine, the third input of the second AND-NOT element is connected to the first address input of the switch and the first input of the device mode setting, the second address input of the switch is the second input of the device mode setting, the output of the second driver and the second input of the first element AND NOT. are respectively the output of syn. the synchronization and synchronization input 25 of the scan of the device from the computer, the outputs of the first and second triggers are the corresponding outputs of interrupt requests to the fax machine of the device, the installation input 30, the shift register is the input synchronization output from the computer of the device and is connected to the first input of the OR-HE element and through the delay element to the clock input of the shift register, the second input of the OR-HE element is the input synchronization input from the device's fax machine.