RU1836712C - Device for digital information exchange - Google Patents

Description

the acknowledgment input of element 41 (47) is connected to the inverse input of element 43 and the direct input of element 44, the output of element 44 is connected to the first input of element 45, the outputs of elements 42,43.45 are connected to the first, third, and fourth inputs of element 46.

The device operates as follows.

In the initial state, a high (logical) level is present at all, inputs and outputs of the control units, blocking signal generators and lines (DAV, NRFD, NDAC) of the interface lines.

The control unit transmits the acknowledgment signal DAV in all directions in accordance with the operating algorithm of the known duplex device. In addition, the control unit determines and remembers the location of the source: on the right or left or of the device (object) in question or in the object itself. This determination is based on the acknowledgment signal DAV, which corresponds to a low level. Based on the operation of the known device 19, at the inputs and outputs of the control unit during the passage of the acknowledgment signal DAV, there will be unambiguous combinations of signals with low and high levels corresponding to the location of the source with respect to the object under consideration. Thus, the control unit, using its elements 19, 20 and through its first to third control outputs, ensures the operation of the blocking signal generators in three modes, respectively: the first mode is the mode of the first direction transistor when the source is on the left, the second mode is the transit mode of the second direction when the source is located on the right, the third mode is the source mode. The control unit by means of a signal, at the fourth output of block 20, its elements 33, 34 and through its fourth and fifth outputs, allows the operation of the NRFD acknowledgment signal blocking signal line driver in the absence of the acknowledgment signal DAV and the NDAC acknowledgment signal blocking signal generator in the presence of an acknowledgment signal DAV and prohibits their operation in unpleasant cases and in the event of a conflict when two sources appear in the system. When the acknowledgment signal DAV (transition from high to low) occurs, the control unit, using the driver 35 and through its sixth control output, supplies a short low-level pulse to the acknowledgment output of the line blocking signal driver NRFD, which leads to the occurrence of the acknowledgment signal 5 or NRFD at the indicated acknowledgment input / output and blocking of this signal due to the blocking signal generator element 37. A similar occurrence and blocking of the acknowledgment signal occurs.

0 NDAC at the acknowledging input-output of the driver of the NDAC mask of the lock signal when the acknowledgment signal DAV (low to high) disappears using the driver 36 and

5 is a short low-level pulse supplied through the seventh output of the control unit.

Shaper signal lock (FSB) works as follows. Block

0 control sets the FSB of its object four operating modes.

Transit mode of the first direction. The transit regime of the first direction occurs at the FSB upon admission to it

5 is the first low-level control input. In this mode, the FSB element 41 commutes the second input of the logical blocker with its first output, and the element 47 sets the FSB at the second output

0 low when there is a signal with a low level at the first input and there is no acknowledgment signal at the FSB acknowledging input-output; in all other cases, element 47 sets the second output

5 FSB signal with a high level.

Transit mode of the second direction. The second-direction transit mode occurs in the FSB upon receipt of a low-level signal at its second control input.

0 level. The FSB operating mode in this case occurs similarly to the above with the difference that the stated roles of elements 41 and 47 are interchanged. Source Mode

5 The source mode occurs in the FSB when

when a signal is received at its third control input at a low level. In this mode, the acknowledging input-output is switched with the outputs of the FSB.

0

Prohibition mode.

The fourth mode of prohibition occurs in the FSB when a signal with a low level arrives at its fourth control input.

5 In this mode, all inputs and outputs of the FSB are disconnected and the outputs are set to a high level.

The stated interconnection of the acknowledgment signals of the device (see Fig. 2) fully corresponds to the interconnection of signals of the known three-wire acknowledgment system.

Fig. 1 is a functional diagram of a device of a three-wire handshake acknowledgment system in the presence of communication between two objects. If it is necessary to increase the number of objects connected in series, the proposed device is expanded. .To do this, additional transceivers, communication channels, control units and logic blockers are used. In this case, the corresponding inputs and outputs of the control unit, which are not involved in Fig. 1, and the corresponding inputs and outputs of the logical blockers, which are in Fig. 1 are interconnected, connected to an additional transceiver. The branching from the transit object to another (other) objects is carried out by connecting an additional proposed device to the object interface line. In these cases, at the extreme objects of the organized network, the corresponding outputs of the logical blockers are interconnected similarly to the connections shown in Fig. T.

The device allows the connection of remote objects in which a three-wire acknowledgment system is used to exchange information.

The device does not require for its work receiving from the outside or from the connected object (source, receiver) program instructions,

In a network created using the inventive device, the source can arbitrarily without affecting the technical means of the network change its location, thus, this network is transparent to the receivers and sources connected to it.

Claims (1)

The formula is invented and a device for the exchange of discrete information containing the first and second interface lines, the first and second simplex communication channels, the first and second transceivers, each of which consists of a receiver, a transmitter and a pulse width selector, the inputs of the transmitter and a pulse duration selector are combined , the output of the pulse width selector is connected to the control input of the transmitter, the output of the transmitter is a linear output of the transceiver, and the output of the receiver is by the linear input of the transceiver, the linear output of the first transceiver through the first simplex communication channel is connected to the linear input of the second transceiver, the linear output of which through the second simplex communication channel is connected to the linear input of the first transceiver, characterized in that, in order to increase the speed of the device into it introduced the first and second 0 control units, the first to fourth blocking signal generators, acknowledging the inputs and outputs of the first and second control units are connected to the lines of the acknowledgment signal DAV, respectively 5 of the first and second interface lines, acknowledging the inputs and outputs of the first to fourth blocking signal drivers are connected, respectively, to the NRFD acknowledgment signal lines, 0 NDAC, respectively, the first and second interface lines, the first inputs of the first and second control units are respectively the first and second inputs of the device, the second inputs are connected to 5 by the first outputs of the first and second transceivers, respectively, the second outputs of which are connected to the first inputs of the first and third blocking signal drivers, respectively, the third outputs 0 of the first and second transceivers are connected to the first inputs of the second and fourth blocking signal generators, respectively, the second inputs of the first and fourth blocking signal generators are respectively the third and sixth inputs of the device, the first outputs of the first and second control units are respectively the first, and the second outputs of the device, the second outputs are connected to the first inputs of the first and second transceivers, respectively, the second inputs of which are connected to the first outputs of the first go and third shapers 5 blocking signals, respectively, the third inputs are connected to the first outputs of the second and fourth blocking signal generators, respectively, the second outputs of the first and fourth blocking signal generators are the third and sixth outputs of the device, the first and third control outputs of the first and second control units are connected to the control inputs of the same name as the first and fourth blocking signal drivers, respectively., the fourth control outputs of the first and second control units laziness connected with similar inputs of the first and third lock signal formers, respectively, n Tide control outputs of the first and second control units are connected to fourth inputs of the second and fourth formers sig catch blocking, respectively, the sixth and the seventh control outputs of the first and second control units are connected respectively to the acknowledging inputs / outputs of the first to fourth drivers  blocking signals. DAV NKF S Ndac FIG 2 i .p a evil tout, and with al / x about 3 f Q and Thiru fO walk-in & go -about fc-o about- Figl Qui 7u. (missions dxoff. „