DE1294991B - Key-controlled teletype transmitter for the transmission of code characters according to the start-stop procedure - Google Patents

Description

1 2

The invention relates to a key-controlled. This also has the advantage that

Teletype transmitter for the transmission of code - even with irregular keying in the average characters according to the start-stop procedure. This Sen- lie the insertion speed equal to the maximum which generally work according to a code with transmission speed, whereby individual five stream steps, where each code character can follow 5 characters in a shorter distance than the can have two meanings, depending on the time of transmission of a character, commonly a code symbol "letters" or a code. In the following, a

character »digits« was sent. An embodiment of the invention is described in more detail, this code character takes effect until the other shows it

is sent. Accordingly, the characters io F i g. 1 a compilation of the used divided into the group of letters and the switching symbols, as far as they are not generally used group of the digits to which the Interpunk is borrowed,

tion characters belong. Neither of the two groups is Fig. 2 a block diagram of a key-controlled

listen to the operating signals for which the previous telex transmitter, taking from several circuit broadcast of "letters" or "digits" without elements through units in FIG. 1 interpretation is. For most telex transmitters, the symbols created and explained below are followed the switchover between the two groups is combined, by pressing an appropriately labeled,. ,.

Button; accordingly, buttons can be used at the same time as button symbols

a character of the letter group and the corresponding 20 Fig. la shows an AND gate, Fig. Ib an OR gate speaking characters of the group of digits and F i g. 1 c an inverter. Inverters and gates can be. are summarized, then the relevant

On the other hand, keyboards are known which have a point for each entrance or exit of the gate Characters of the two groups have marked separate keys; Fig. Id shows an AND gate with and are therefore called full keyboards. 25 a blocking input, which is indicated by a point at the input

There are already transmitters with full keyboards. Several goals can be combined in one know that the switching between the two group symbols, like F i g. 1 e shows how to do pen automatically by pressing the ent- F i g. 1 f shows a shift register unit. The corresponding toggle symbol automatically sent out by this unit is illustrated by the next to it, when a circuit diagram is explained after a key of one group. This contains two buttons of the other group is actuated, but flip-flops FFl and FFI with two input gates each are complicated mechanical devices and an inverter. The two postures one uses that require constant upkeep. Flip-flop can occupy, be with 1 and 0 be-The invention is based on the object of this draws. A flip-flop is then on position 1, complicated mechanical device by a 35 if the output on the designated side replaces the electronic device, which assumes little potential 1. Then the exit is that occupies the space and works without maintenance and without a non-designated side on the potential 0. Through use. a 1 potential on the input on the designated

In the case of a key-controlled teletyping side, the flip-flop is set to 1, by a transmitter for the transmission of code characters after 40 1-potential on the undesignated side to 0. The start-stop process, which is a full keyboard, in general the unit is used as a shift register a transmitting electronic memory for storing unit, then) is located at the input a _2, the Indian the code characters forming bits and a training verted signal a _x (a ₂ = (Z ₁ '. When the input t the gear shift to the successive transmission Shift register unit goes to 1, the stored bits are sent to a transmission line, the output gates of the circuit are opened and FF1 is set to the position according to the invention by setting each key to the input a _x - At the end of the i-pulse the second pair of gates is opened tion triggers another bit, which for all book and position of FFl and FF 2 would be a first and for all digits the second. Through the input and r , both flip-flops can have the value that the bit combination and the further 50 are set to 1 or 0, regardless of the bits in an electronic memory fed to inputs t and a _v a ₂ . However, the unit can also be which at least one bit combination work as a counter for the pulses t : If both and the associated additional bit stores that an input a _t and a _{2 are} at 1, FFl changes its clock to transmit the Bit combination and position when t goes to 1, and transfers this position of the further bit from the storage memory to FF 2 when t goes to 0. Transmit memory and the output circuit for over- The symbol of the F i g. 1 g denotes a single

Transfer of the bit combination from this transmit memory flip-flop to two input gates and one rather on the transmit line controls and a device inverter. When the clock input t goes to 1, this transmission of a bit combination on the flip-flop goes to the position 0 or 1, corresponding to the transmission line temporarily blocks when that with 60 the potential on the input a. This bit combination transmitted further bits a The telex transmitter according to FIG. 2 has the following,

has a different value than the additional bit transmitted with the previous one in the drawing by dash-dotted lines of bit combinations, and each has separate units: a clock generator I, after the other value an operating symbol for a keypad II with seven contacts T ₀ to T ₆ , switch the receiver from letters to digits 65 whereby, for the sake of simplicity, only one of the contacts T ₁ or from digits to letters is generated on which is shown up to T ₅ and denoted by T ₁ ... ₅ , transmits a transmission line and then the temporary electronic storage device III triggers an electrically blocked transmission of the bit combination. niche transmission memory, consisting of one part

3 4

and a part IVb, a repeating device V, is connected to the zero output of CO, blocks a switching device VI from letters to so that no further transmission of the digits and vice versa, an output circuit VII units B to the units C can take place. The and locking device VIII. Exit from EG is after reading the character

5 went back to 0, so that with the third δ-pulse

Clock ^m ^ ^e - ^ "Stuf ^s of a shift register 0 read

is, at the fourth 6-impulse is in the B-stages

It contains a single pulse generator / G, which reads in a 0 while the A -steps remain at 0, runs continuously and a square-wave voltage b with the same value of io as described in the following section, which gives off 400 Hz. This frequency is triggered by the transmission, but can already be divided by 2 before the shift register unit A. A second character is read out and the output frequency is further divided by 2 by the shift register unit B in the same way as described to the stages A , if a signal OK is not forwarded to the shift register and B is transmitted. It remains in effect. In this case, however, output 15 appears to be stored in the B stages, since the output of B goes to 0 via the OR gate OG at the input of one of OB as soon as the outputs of divider-by-8 from the shift register units BO and CO indicates that these units consist of 1 D, E, F , but only runs when M = I. are posed.

In the rest position of the divider, D, E, F are at 0. In the same way, a third character can be added

The outputs of the divider-by-8 control a de- ao in the A stages of the shift register.

coderDl, which has eight outputs i0 to ti , of which the output from OA also goes to 0

which i0 in the rest position of the counter il to ti and thus the AND gate UA is blocked. Through this

one after the other when the counter 1-potential is running, an IS is set in the keypad via the inverter

accept. If i0 = 0, then B zero built magnet MS is actuated, which when actuated

and the bypass route via the and-not 35 prevents another key from being pressed.

Gate Vl is open, so that at the entrance of the divider, experience shows that a storage of three is sufficient

The output frequency of A appears. Signs of typing irregularities

even at very high writing speeds and at

Storage in the storage ^tank _{5 ° o BaUd c} ^Ausl ef8 ^esch . ^to compensate for the dexterity, like that

30 that a letter with maximum average

Γ0 to T 6 are contacts of a keypad. This speed is made possible. It is, however, possible without a full keyboard, ie each letter and number can be further assigned, the number of shift register levels and each character is assigned its own key. to increase. Each time the key is pressed, the contact TO is closed, as well as a combination of contacts up to 75 corresponding to the keyed character after 35 characters have been sent out, the international tegegraph code No. 2, and by setting the shift register unit C0, contact T 6, when the character for the row of digits appears at the output of the OR gate OM a 1 belongs to the telegraph code mentioned. The code - if we assume that the other two Einrung takes place mechanically, also by a 40 gears of this gate, which prevents the 1-outputs of the flip-mechanical device, that flops So and W come at the same time, are set to 0. (If this can be pressed more than one key. Is not the case, the output of OM is already 1.)

Closing the contact Γ0 draws an in. Thus, as described above, the divisor-by-8 takes place

pulse generator EG , which emits a delay DEF , and the pulse part up to ti is output.

th pulse emits, which sends a length of at least 45. At a walking speed of 50 baud

one, at most IV2 periods of the pulse gene- each of these pulses has a duration of 20 milli-

rators / G has and with b ', ie with the end of a second.

^ Pulse begins. At the beginning of the next b-Im- In the idle state, the output i0 of the decoder pulse is set to the shift register unit A 0, the Dl to 1, so the input i0 of the OR pulse appears at the output of A 0 with the end of 50 gate OL , whose output with the line L verdes ft-pulse. At the same time the EG impulse appears is bound. Accordingly, in the idle state, the line is at the inputs of the contacts T1 to T6 and is permanently in state 1, ie in the state permanently closed by the contacts to the one-stop polarity. During the time 1 1, the output of the shift register units A 1 concerned goes from OL to 0 (start). In the course of time, you will be directed to A 6. Thus, with the already mentioned 55 by combining the signals b, A, B, A ', B' two second ft-pulses, the code character is written into these shifting consecutive and non-overlapping register units and formed with the third pulse ill and 1 12. The pulse ill triggers a 6-pulse on the shift register units B1 to B 6 when the flip-flop to be discussed later is H = O , with the fourth b-pulse on the shift register unit at the output of the gate UZ, a signal Z from which a unit Cl to C 6 transferred. The pulses b reach 60 Transfer of the positions of the shift registers to the control inputs of the shift register units via units C 0 to C 6 on the flip-flops 50 to S 6 causes the AND gates UA, UB, UC, which are normally used for the transfer from C6 to 56 goes the Z-Imopen. In the same way as the character bits pulse via the AND gate US6, which can be blocked by the output that corresponds to the position of the contact Γ 6 of the decoder D 2, as described later by the digit bit through the shift register AQ, BO, CO is, however, pushed through during the transmission of, so that the position of the digit bit letters and digits is opened. The signal Z in each case corresponds to that of the character bits. As soon as C 0 also acts on the outputs of the OR goes to 1, the OR gate OC, whose input gates OC and OB, allows the information to be shifted.

5 6

mation in the supply register by one step causes the flip-flop K to be switched, since it was previously one of 56 (from A to B, from B to C). had different positions and now on the position

During the following times ί 2 to i6 are set by 56. At time / 12, H is set to 0 the five AND gates US1 to USS in sequence, since K and 56 open the same positions through the pulses ί2 to i6 and thus take the 5. In the following times ti to f6, the positions of the five shift register units S Ibis S 5 in the memory 51 to SS signals contained on the line are scanned and transmitted to the line via the OR gate OL .

transfer. The outputs of the gates UL 2 to UL 6 _,. , _TT,,

are in the mentioned case to 0. At time ti, the automatic switchover is blocked

also lasts 20 milliseconds, the with ti io ^and transfer

The designated entrance of the gate OL is set to 1 and there are some characters in the telegraph code no.2

thus given stop polarity on the line. Whilst the meaning is independent of whether the prevailing of the first quarter of the time ti is 50 to 0 switching to letters or digits; if there was no further sign to be transmitted. _{These are the operating symbols} : carry is, CO is equal to 0, the output of OM goes to 15, Trr, ", .. ,,, to 0, the divisor-by-8 DEF is still idle- ™ * = carriage return,

position and remains there, with which the external £? _} ~ ^ line connection,

application of the sign has ended. There is another f ™ ~ ^ wiscüeoraiim,

Character on, after a time to, the duration of which ^UB = unperforated tape (mostly not allowed),

half a normal step, the 20 plus
The counter continues to run and during the time ti the Bu = letter,

Contents of the shift register units CO to C 6 on Zi = digits.

50 to 56 are transmitted as described above. the

The duration of the stop step is the same in this case.

tl + i0 == IV2 step times. 25 the use of letters or numbers is not possible

follow. To lock them, the

Automatic transmission of the characters flip-flops 56 blocked when an operating character is in

"Letters (Bu)" or "Numbers (Zi)" are _{pending in the} shift register units C1 to C5. to

In contrast to the usual transmitters, for this purpose it is not necessary for the present transmitter to connect the buttons 30 C1 to C 5 to a decoder D 2 to which a "letter (Bu)" or "number (Zi)" is assigned to the memory register units Press, emits output signal when there is an operating symbol to switch between letters or apart from Bu and Zi. To make the outcome of this decipher. Since every letter and coder is assigned a key to the blocking input of the AND gate US 6 every digit (this also includes the interpunk and prevents the Z-pulse, the flip-flop tion symbol), 35 56 is to be switched over. This also determines which character prevents the transmission of a character and should be printed automatically by pressing the key. By storing When one of the buttons Bu or Zi is pressed,

of a digit bit in the storage memory, the switchover from 56 should not be prevented here either. This digit bit becomes the, but there should be no automatic transmission when the character is transmitted to the send 40 of a further Bu or Zi character. To memory stored in the flip-flop 56 and at the time ί 7 and would be transferred to the flip-flop K in the event of an automatic character exit. If the number, letter and number keys have not changed any more, K and S6 are now set to required, but they can have different positions for certain functions. If the change of number is appropriate, e.g. B for signaling by means of more letters, then one or both keys can be pressed 45 times with the registered letter. To in from 0 in 56 the output of the AND gate UKl to 1, in this case an automatic transmission of Bu da K from the previous character is set to 1. If avoid or Zi, be a carried out by değer transition in the reverse direction, so coder D 2 outgoing signal at Bu or Zi are interchanged, the positions of 56 and K, and the gates UKl and locked UK2, so that while the flip -Output of UKO goes to 1. In both cases 50 flops 56 and K are set, but not flip, the 1 appears at the output of OK and currently sets flop H, which controls the automatic transmission. il2 the flip-flop H to 1. The output of this flip "..,, _u ". ,,

flops is with a blocking input of the and gates USl Repeated sending of signals

up to t / 55 and thus blocks the scanning. The repeated transmission of the same character

the shift register units 51 to 55 through the gates 55 is done in a simple manner by simultaneous US1 to USS. Instead, appears during the keys of the relevant letter or. Numeric key times t2, t3, tS, t6 a 1 at the exit of the gates and the repeat key Tl. By pressing UL2, ULT), ULS, UL6. If 5 = 1, that is, if Tl , the flip-flop W is set to 1, but should only be given at the time of the insertion register Zi, er time ti. First, the keyed-in book slip of time i4 is sent a 1 at the output of the AND sticks, as described above. After the gate ULA, with which the mark Bu (Hill) excluded transmission of the sign flip-flop goes to 1. Dasendet W is; with the character Zi the OFF is during t4 , the AND gate UZ is blocked and the external output of ULA = 0, so that the character Zi (11011) generation of the pulse Z and thus the transmission of the is sent. next character from memory C to memory 51

The output signal from H blocks at time ί 7 the 65 to 56 blocked. At the same time appears over the OR-zero position of 50, so that the output of OM Tot OM permanently the signal M at the input of remains at 1 and the counter during a further divide-by-8 DEF, and this continues to rotate continuously. At the same time , however, ti is and constantly causes the transmission of the

rather Sl to 56 stored characters. After releasing the key Γ 7, the current character is first transmitted to the end and then at time ti the flip-flop W is set to 0 again, whereby the character transmission is ended.

A simplified circuit was chosen for the example. It is known to those skilled in the art that the same logical functions in different ways and with different types of switching elements Implementation can get. The memory can also be designed differently, e.g. B. as magnetic Memory, or can be organized differently: The output memory can be used as a shift register work, the storage memory can instead of a shift register with fixed input and output and moving information in a known way as a memory with fixed information and moving input and output are formed.

Claims (4)

Claims: ao 1. Key-controlled teletype transmitter for the transmission of code characters according to the start-stop procedure with a full keyboard, an electronic transmission memory for storing the bits forming the code symbol and an output circuit for the successive transmission of the stored bits on a transmission line, characterized in that each key, in addition to the bit combination corresponding to the character, triggers a further bit, which has a first value for all letters and the second value for all digits, that the bit combination and the further bit is fed to an electronic storage memory, which at least one bit combination and the associated additional bit stores that a clock the transfer of the bit combination and the other bits from the storage memory to the Transmit memory and the output circuit for transmitting the bit combination from this Transmission memory on the transmission line controls and a device this transmission of a bit combination temporarily blocks the transmission line if the additional bit transmitted with this bit combination has a different value than the further bit transmitted with the previous bit combination, and depending on the other Value an operating symbol for switching the receiver from letters to numbers or from Numbers generated on letters, transferred to the transmission line and then temporarily Blocked transmission of the bit combination triggers. 2. Teletype transmitter according to claim 1, characterized by a locking device which said device blocks when the bit combination corresponds to an operating symbol. 3. Telex transmitter according to claim 1 or 2, characterized in that the storage memory is a register in which the first bit combination transferred into the empty register is and the other bit assigned to it in the one closest to the output of the register Register level is saved. 4. Teletype transmitter according to one of the preceding claims with a repeating device for the automatic, continuously repeated transmission of any character, which is carried out by Pressing a repeat key is triggered, indicated by a flip-flop, which is indicated by the actuation of the repeat key, but not before the end of the transmission of a bit combination on the transmission line, is placed in a state in which it is the transmission a bit combination and the associated additional bit from the storage memory into the transmission memory blocks the continuously repeated transmission of the bit combination stored in the transmission memory and after releasing the repeat key, but not before the end of the transmission of a bit combination the transmission line is reset to its idle state, whereby the continuously repeated Transfer is ended. 1 sheet of drawings 909520/61