DE2302621C2 - Coding device for the contacts of a contact field - Google Patents

Description

3 4

κ \ λ; ~ Aiicoänop η «r;„ ö -κι jj especially emphasize that the three bistable

^} iSreSmelnien des Π, ΐ l Γ ""!, ^ flip-flops existing monitoring logic in their

ΑΤΓΓΓί data selector and with _A ^ is independent of the number of

the incoming of an interim Schenspe.cher _connected contacts. This differs from the

^en> 5 coding device according to the invention advantageously of

c) the data selector switches in known coding devices in which the on-way its output on the wall for the monitoring circuit with the number Data input, the binary character of which increases with that of the contacts.

Addressing inputs pending; An embodiment of the invention is in

_x,. . ^ ίο drawing shown and is explained in more detail below

d) the output of the data selector controls the described. In the case of the buffer memory used for the exemplary embodiment for taking over the logic selected by the binary character output as the "O" signal, the ground potential Bmärzähier applies. _an d _a i _s "l" signal a positive voltage. An open contact is also perceived as a "1" signal

For the coding device according to the invention, 15 is the. All shown with a full arrowhead

Dynamic triggering inputs only take effect when switching

This is particularly the case with a large number of »1« - to »(k signal.

of contacts is a significant advantage. The coding device shown is for 15 con

One embodiment of the invention provides that clocks KO to K 14 are designed. Each of the contacts of the output of the data selector via an inverter 20 KO to K 14, which should be bounce-free, has a character element connected to a NAND element whose binary character from a character string 0 to the input is connected to the clock generator and 14 assigned in binary representation. This character whose output signal, the set input of the intermediate sequence, is continuously controlled by the four-level binary memory. This locking of the counter 1 with the clock of the clock 2 is formed. The output signal of the data selector with the clock 25 square-wave frequency of the clock must be so high that the signal runtimes are output from the binary counter during the period of time in which the binary counter and the data selector contact are closed with certainty all arise with the falling signal edge of the clock. Count the character string at least once. From-

A particularly advantageous development of the outputs 1 A to 1 D of the binary counter 1 provides two bistable flip-flops connected to the invention, the inputs of the buffer 4 and a preparation input of the data selector 5 for each side connected to the addressing pass . The input as well as a set or reset input and data inputs of the data selector 5 are connected to the one dynamic active contacts KO to K 14 that are common to both sides and that have constantly kenden triggering input, with the "O" signal pending. The data input, to which the highest preparation inputs of the first flip-flop is always present as a "1" or "O" signal and its outputs are assigned to the address, always carries the "1" signal, since the preparation inputs of the second flip-flop with the following monitoring circuit are switched, one output of which emits a takeover signal for the buffer store each time the counter is run, and which can be brought.

in each case the set input of each flip-flop at output 40 A data selector, also known as

of the data selector or the NAND element is multiplexer is known, has a number of data inputs

and the dynamic triggering inputs of the two gears, several addressing inputs and a single one

Flip-flops with that output of the binary counting output. The data selector switches the

lers are connected, the most significant bit position that data input to its output, its

leads. 45 address is selected at the addressing inputs.

While the one output of the second bistable A known electronic embodiment of a Flip-flop of this logic circuit, the takeover data selector contains a number of AND gates, the signal for the buffer memory can be connected to the input side with a data input and A signal is tapped from its other output and all addressing inputs are connected in this way the one that indicates when a contact is closed. 5 ° are that the AND condition is met when on This signal can be used by a computer as the addressing inputs for the relevant data acquisition signal Binary characters assigned to the buffer output are pending. The evaluated will. courses of all AND elements are via an OR

This monitoring logic can still be linked to the output of the data selector

third similar bistable flip-flop are added, 55 performed.

whose preparatory inputs are connected to the outputs of the first trigger stage and its reset selector S, the contacts KO to K14 of the Kone input with an output of the second trigger stage, to which a common signal is connected on the input side and whose dynamic triggering input can be evaluated (O signal) is pending, on the output side via an AND element by linking a 60 connected to the relevant data inputs, separate output with the output of the data selector while the addressing inputs are controlled with the outputs gate or the NAND element. IA to ID of binary counter 1 are connected. There

This third bistable multivibrator changes its from binary counter 1 continuously the data input

Signal status always when several contacts and the contacts connected to them are assigned

be closed at the same time. It can thus be formed into the 65 ordered binary characters and sent to the addressing

Error display and to block the query of the inputs of the data selector 5 are set, switches

Buffer can be used. this one its data inputs consecutively

In the case of the coding device according to the invention, its output 6.

The signal at the output 6 of the data selector 5 represents the closed contact associated with binary characters via the inverting element 7 in the NAND element 8, this is now in the buffer and the clock of the clock 2 locked in order to prevent can be queried at its outputs. The the fact that the buffer 4 gives during the time "1" signal at the output 27 of the flip-flop 20 at intervals can be set that the binary counter 1 5 equal to that a contact is closed and can for the complete formation of a binary character thus act as an acceptance signal for the stored compels. Binary characters are used.

Between the output 9 of the NAND element 8 as soon as the binary counter 1 ends its cycle

and the set input of the buffer 4 is a hat and the dif! most significant bit position lead-

Monitoring logic is arranged, which from the three bi-io the output ID the signal state from "1" to "0"

stable tilting stages 10, 20 and 30. The dynamic triggering inputs receive the changes

Preparation inputs 12 and 14 of flip-flop 10 13 and 23 of flip-flop 10 and 20 signal edges,

there is a constant “1” or “0” signal. Your outputs The flip-flop 10 is reset because it is at your

16 and 17 have already been created with the preparation inputs 22 preparation inputs 12 and 14.

and 24 of the flip-flop 20 connected. The dynamic 15 speaking is prepared. The tilting stage 20 remains

Trigger inputs 13 and 23 of the two flip-flops 10 are set next. However, it is

and 20 are at output 1 D of the binary counter 1 Set the flip-flop 10 for resetting

connected. This output has the highest value. Only when a counter run has taken place in which

term bit position of the binary character string. no more contact was closed, so will the

When the circuit is put into operation, flip-flop 20 is reset. This ensures

should, first the three flip-flops 10, 20 and that the flip-flop 20 then only a single one

30 aligned so that their outputs 16, 26 and 36 emits setting pulse to the buffer 4, if

"1" signal and its outputs 17, 27 and 37 "0" - one contact several. Long counter cycles closed-

Lead signal. The resetting of the three flip-flops remains.

can be sent by a directional pulse with a "1" signal to the 25 The flip-flop 30 should issue an error message, reset inputs 11 and 21 when switching on the power supply if several contacts occur during a counter cycle. The circuit brings itself to be closed at the same time. Your preparation, however, even in this state, if during inputs 32 and 34 are therefore no 16 and 17 of the first flip-flop 10 connected to the outputs of the first two passes of the binary counter, and their contact is closed. At the end of the first counter 30 reset input 31 is connected to the output 26 of the two-pass changes namely at the output 1 D of the th flip-flop 20. The dynamic off binary counter 1 the most significant bit position of "1" release input 33 of the flip-flop 30 is controlled by the AND to "0", thus using the dynamic trigger element 41, which resets its own output 36 input 13 and resets the flip-flop 10 prepares the flip-flop 30 with the output 9 of the NAND flip-flop 20 for resetting. At the end of the 35 link 8 linked. As soon as a contact is closed, the second counter cycle is then also the Kipp-, the Kippstute 30 is prepared for setting, stage 20 via its dynamic trigger input 23 since its preparation inputs are reset with the outputs and in turn sets the toggle stage 30 via the first toggle stage 10 are connected . If other reset input 31 is back. No further contact at the end of a counter run

As long as no contact is closed, appears on 40 is closed, resetting the Output 6 of data selector 5 always has a "1" signal. Tilt stage 10 this preparation is canceled again. However, this "1" signal is still transmitted via the inverter 7 in the will during a counter cycle NAND gate 8 blocked. The three bistable toggle - another contact is closed, so the toggle stages remain in the reset state and stage 30 is set and enter 37 at their output Buffer 4 is not set. 45 »1« signal off, which serves as an error message. the

As soon as one of the contacts is closed, the flip-flop 30 can only dei from output 26 again

a flip-flop 20 appears to be reset at output 6 of data selector S if at least:

"0" signal, if the binary counter 1 detects the relevant counter cycle without a closed contact.

Fenden contact outputs associated binary characters is as follows.

and thus the corresponding 50 in the data selector

Selects data input. This is 15 contacts laid out on all contacts and requires a four-stage

The »0« signal on the output side is transmitted via the opposite binary counter and a four-stage intermediate

closed contact on output 6 of the data memory. When the circuit is on a larger scale

selector is to be switched through and contacts are to be expanded after a number of signals, so must

Return through the inverting element 7 in the NAND element 8 55 only the binary counter, the data selector and de

with the> 1 «signa! of the clock locked. The "0" buffer has been expanded by additional bit positions

The signal at the output of the NAND gate 8 will be in. The possible number of connectable)

converter element 40 is converted into a "1" signal and contacts are always obtained from the formula 2 ^N - 1

sets the two bistable flip-flops 10 and 20. if N represents the number of available bit positions

Your outputs 17 and 27 now carry a "1" signal, 60 is. The data input that has the highest binary

while outputs 16 and 26 carry a "0" signal. character is assigned as an address, · should not be mi

The change from "1" to "0" signal at output 26 is assigned to a contact because the transition from voi

the flip-flop 20 sets the buffer 4, in "1" to "0" at the counter output 1D the bistable

which resets the current count of the binary flip-flops 10 or 20 and while:

counter 1 is read. Since this is not the case, no signal can be processed.

1 sheet of drawings

Claims (4)

1 2 Output (36) with the output of the data elec- Claims: tors (5). or the NAND gate (8) is controlled.
• 1. Coding device for the contacts of a Contact field, each of which has a characteristic 5 binary character from a binary string
is assigned, which is a binary counter continuously
forms with the clock of a clock whose Clock frequency is greater than the input frequency, The invention relates to a coding device for characterized by the combination io the contacts, a contact field, each of which is a of the following features: characteristic binary character from a binary _a \ Hi, ifnntoVtaiFo u · ιτλλ \ a ■ character string that a binary counter con- a) the contacts (KO to K 14) at which em- _ünuierlich ^B _with ⁶ _{to the} clock forming a clock generator, a common clock frequency can be evaluated _d gangssemg pending greater than the input signal, on the output side to the _χ f _reauenz corresponding Dateneiugänge a data _e g rartige encoders are often used in selector (5) connected, electronic keyboards for signal input into a b) the outputs (IA to ID) of the binary counting computer or an electronic control system (1) are connected to the addressing inputs of the jjet. The data selector (5) assigned to the individual keys of the keyboard and with the inputs _{ao neten} binary characters are connected in known coding in a buffer (4), directions are formed in a coding matrix, whereby for c) the data selector (5) switches in per se each individual key the bit pattern of the characteristic known Way, its output (6) each see binary characters with a corresponding form the data input whose device is established. For keyboards with a large Binary characters at the addressing inputs - the number of keys is therefore a considerable problem, effort required, which is also due to the d) the output (6) of the data selector (5) takes up a large amount of space and is undesirable. In addition, who controls the buffer (4) to the coding matrix and additional circuits would take the output from the binary counter (1), which would indicate whether a key was actually pressed Binary character. 30 is done, and they issue an error message if several buttons can be operated at the same time. Especially 2. Coding device according to claim 1, in particular the latter requirement is only with characterized in that the output (6) of the great expense through analog construction to reali-data selector (5) on an inverting element (7). a NAND gate (8) is connected, the second 35. A coding device is already known at The input is connected to the clock generator (2) and the one clock generator connects to an electronic counter. whose output signal is the set input of the drive (USA.Patent 3 662 378). The exits Schenspeichers (4) controls. of the counter with the lowest valences 3. Coding device according to one of the responses from a decoder and the outputs Proverbs 1 or 2, characterized by two 40 with the highest valences from a multiplexer bistable flip-flops (10, 20), the input side 'scanned. When a contact is closed, a a preparation input for each side connection between the output of the decoder as well as a set or reset input and one and one of the inputs of the multiplexer are established, act dynamically for both sides - if the counter is the one assigned to the contact have the trigger input, with 45 binary characters being reached, the multiplexer supplies a triggering input (12,14) the first toggle signal, which blocks the clock signal of the counter level (10) there is a constant "1" or "O" signal and thus stops the counter. The clock signal remains and their outputs (16, 17) blocked for preparation as long as the contact is closed. device inputs (22, 24) of the second flip-flop (20) This known coding device requires one to be switched on are, one output (26) of which a significant amount of logic logic element takeover signal for the buffer (4) dem, multiplexers and decrypters. outputs, and in each case the set input (15 The invention is based on the object of providing a or 25) each flip-flop (10 or 20) on the off coding device for the contacts of a contact path of the data selector (S), or the NAND field, which have a low schaltungstech element (8) and the dynamic triggering niche requires effort and through simple input inputs (13 or 23) of the two toggle stages (10 extensions for a large number of contacts or 20) with that output (Ϊ D) of the expandable. In the encoding binary counter according to the invention (l) connected, the dth highest direction should furthermore consist of a simple logical significant bit position leads. Circuit signals are obtained that indicate whether 4. Coding device according to claim 3, a contact or whether more than one contact is closed through a third similar bista- is. büe flip-flop (30), whose preparation inputs. According to the invention, this task is achieved by the (32, 34) solved with the outputs (16, 17) of the first combination of the following features:
Flip-flop (10) are connected and their return set input (31) with an output (26) of 65 a) the contacts at which an expand on the input side The flip-flop (20) is connected and its evaluable signal is present, are on on the output side dynamic trigger input (33) via an AND the corresponding data inputs of a data element (41) connected by linking its own selector;