DE1037525B - Circuit arrangement for the coded transmission of identifiers in systems of communication technology - Google Patents

Description

kl. 21a ³ 67/50

INTERNAT. KL. H 04 St.

PATENT OFFICE

S53467VIIIa / 21a ⁱ

REGISTRATION DATE: MAY 13, 1957

NOTICE
THE REGISTRATION
AND ISSUE OF THE
AfSLEGESCHRIFTr 28 AUGU ST 1 9 5 8

In systems of communication technology there is often the task of providing information such. B. those which are present in the form of several potentials, to be transmitted via only a few lines, usually two. One such transfer is e.g. B. required when the message content from a memory to a Is to be transferred to a register in the voter setting set or when selecting the keyboard from a keyboard.

In order to get by with as few lines as possible in such information transmissions, one has the message content is already transmitted in the form of a code, preferably in the form of a binary code.

So it is z. B. has already been proposed, four different potentials with the help of two in series to convert switched relays into a binary code, whereby this circuit is used twice Four times four identifiers are to be transmitted over two lines. In this circuit, this is one of the Relay connected in series bridged by a directional conductor, so that it is only with a certain current Direction. A disadvantage of the proposed circuit is that the relays of a certain Must meet fault current condition that cannot be complied with without further ado, in particular, if the line resistance of the transmission core, via which the various potential levels transmit is particularly large. Also the delayed response of the due to the circuit structure a relay is disadvantageous in the older circuit.

It is also z. B. from British patents 398 812 and 684 608 already known positive and evaluate negative different potential levels via rectifier branches with the help of several relays. However, these known circuits require a considerable amount of components for both Evaluation itself as well as for the potential reversal.

The invention relates to a circuit arrangement for the coded transmission of identifiers, in particular via two lines, and delivery of the identifier in the form of a binary code in Systems of communication technology with four different ones to represent the numbers per line Potentials are available that are appropriately combined and transferred in the Furthermore, two relays are provided for evaluating the four different potentials on each line are, of which one can be excited via a directional director. With the help of such a circuit the deficiencies described are eliminated according to the invention that when applying the first Potential level that a relay is excited via the directional conductor, while when applying the second and third potential level by appropriate control of a transistor acting as a switch Circuit arrangement for coded

Transmission of license plates in communication technology systems

Applicant: Siemens & Halske Aktiengesellschaft,

Berlin and Munich, Munich 2, Wittelsbacherplatz 2

Dipl.-Ing. Otto Kneisel, Großhesselohe near Munich, has been named as the inventor

the other relay or both relays are energized or, in the case of potential-free lines, no relay is energized is. The status of the relays indicates the relevant effective potential level in the form of a binary code.

The invention is explained in more detail below with reference to two exemplary embodiments and a code table explained, namely shows

1 shows a receiving circuit according to the invention with a p-n-p transistor,

FIG. 2 shows a circuit with an n-p-n transistor, FIG. 3 shows a code table.

Fig. 1 shows the use of a receiving circuit E1 , E2 according to the invention with a pnp transistor on two transmission lines a and b. The lines have line resistance Ra and Rb. At each line, a transmitting means Sl and S 2 is further provided. Since each device pair Sl, El or S2, E2 is constructed identically and is effective in the same way, it is sufficient to explain only the device pair Sl, El in more detail below.

The potentials can be generated in any way. Here the four potentials are each connected via one of the contacts k 1, 1: 2, k3 to the lines α or b, which are e.g. B. the voice lines of a message switching system can be created. The contacts kl, k2, k3 can be operated as desired, for example by pressing a button or via relays. Contact kl applies a positive potential supplied by battery B to line a, contact k2 connects the line to a negative potential via a high resistor Wl , while contact k 3 connects the line to a negative potential via a small resistor W2

809 599/127

Claims (3)

3 4. lays. The resistor Wl has, for example, a wear, the relay A or C responds to the following value of 12.5 kOhm, while the resistor W 2 to the way: positive pole of the battery / ?, ge-400 ohms. Since the fourth potential is the state of closed contact k 1, transmission line α or b, "no potential on wire α" or the potential 0 directional conductor G 3, relay A or C, earth. The equal evaluation is sufficient for the transmission of 5 judges G2 is claimed in the reverse direction, four potential levels the three contacts k 1, £ 2, £ 3 are sufficient. so that relay B or D cannot be energized. In place of battery B, a capacitor can now when the second potential is received, are used so that charged at the exchange battery speaks relays B or D in the following way of: and is switched by relay contacts such that earth, relays B or D, rectifier G2, the relevant potential io transmission line a, b, closed contact k2, can be removed from its positive terminal. stood 1 ^ 12, minus. Due to the voltage division between the receiving circuit El according to the invention see the relay B and the resistor W12 in the transistor Tl of the pnp type is used. The transmitter is the emitter of the transistor more positive than the base of the transistor Tl is on the one hand via its base, and the transistor T2 is consequently relay A with the potential-transmitting 15 blocked, so that relay A and C do not respond to line α and on the other hand via one to one can. When the third potential is transferred, the resistor WZ parallel directional conductor Gl is controlled by the transistor Γ2, since the resistor is connected to the emitter and ground. The collector was W2 in relation to the resistor W12 of the transistor Tl is low resistance to the second relay B and as a result is switched by the Spansch, the other end of the winding at the office voltage division between the parallel connection of the battery - U _b . Windings of the two relays A, B or C, D and the pair of devices Sl / E 1, as shown in FIG. 1, the resistor W 2 in the transmitter of the emitter now works as follows: If the first potential transistor T2 is more negative than his Base becomes. So that there is tial transmission, relay A responds to the following when the third potential is transmitted on the path: positive pole of battery B, closed contact kZ both relays A, B closed contact kl, line α, relay A, Right or C, D excited. head of Gl, Earth. In this case, a voltage of the two pairs of devices SIjE1, S2 / E2, sufficient to block the transistor Γ1, should now be used together with the aid of FIG. 3. The transistor T1 is so in this Er- circuits according to Fig. 1 and 2 explained in more detail excitation of the relay A blocked. When transferring the 30. In FIG. 3, the potential to be expanded is in the left column and also when the numerals 1 to 16 to be evaluated are transmitted and the third potential in the first row, the transistor Tl is entered from the relays A, B, C, D. In each controlled, so that in both cases the relay B via rows of the table angedie by a plus sign exchange battery U is _b and enter the conducting transistor Tl, which is the energized relays A, B, C, D for transmission. When the second potential is transmitted 35 the potential characterizing the relevant digit, the relay A receives a fault current. Who are aroused from. A minus sign indicates which relay is not energized for this reason by relay A fault current to be observed for the relevant digit. However, this condition is not critical, since the numbers 1 to 16 can be very high in the transmitter due to the excitation states of the level Wl. Marked at over relays A, B, C, D. The relay A is carrying the third potential, both 40 speak the valency 1, the relay B the valence 2, the relay A, B via the conductive transistor Tl. Relay C is assigned value 4 and relay D is assigned the device value 8 on line b. This results in the binary pair S2 / E2 being in the same way as the code ζ above. B. for the number 11 that the relay A, B and D described device pair S 1 / El must be built and energized (1 + 2 + 8), while relay C does not work accordingly. Only to explain the 45 is excited, which can be seen from the table. Due to the circuit arrangement according to the invention, corresponding combinations are also possible for the codes that can be implemented. For the relays of the one another digits from the table according to FIG. Hch C and D used. The advantage of the inventive receiving circuit arrangement according to FIG. 2 is primarily that large lines are operated with the same potentials as described for FIG. 1 resistors Ra and Rb , however is on and fault current conditions, in particular on the transmitter side instead of the resistor Wl of the circuit according to FIG. 2, are excluded. Resistor W 12 is provided. The resistance W 12 'The circuits according to the invention can be used in the circuit of FIG. 2 is smaller than the decision-55 both at a single line to the encoded crosstalk end resistance Wl in the circuit of transmission of four license plate as well as in correspond-Fig. 1. The resistor W12 can, for example, a combination of two or more lines to have a value of 2.2 kOhm. The relays A, B, C, D coded transmission according to many characteristics in the collector and emitter circuit use one in the characters. Base circuit operated npn transistor T 2. The 60th The collector and the emitter of the transistor T2 are claims: via oppositely polarized directional conductors G2, G3 with the 1st circuit arrangement for coded lines a, b transferring the potentials, in particular via two bonded lines, and the lines facing away from the emitter or collector , and output of the identifier in the form of ends of the relay windings are grounded. The base 65 of a binary code in systems of the messages of the transistor T2 is via a resistor R1 switching technology, in the case of the representation of the at the office battery - U _b and is also grounded via a further identifier per line four different resistors R2. Potentials are available which are transmitted in a combined manner, and in the case of the following: If the first potential is above evaluation of the four different potentials two relays are provided on each line, one of which can be excited via a directional conductor. characterized in that when the first potential level is applied, one relay (A, C) is excited via the directional conductor (Gl, G 3), while when the second and third potential level is applied, by corresponding control in the permeability range of a transistor acting as a switch (Tl , T2) the other relay (B, D) or both relays are energized or, in the case of potential-free lines, no relay is energized. 2. Circuit arrangement according to claim 1, characterized in that an emitter-operated pnp transistor (Tl) is provided, the base of which on the one hand via one of the two relays (A, C) to the line (a, b) and transmitting the potentials on the other hand, via a directional conductor (Gl) lying parallel to a resistor (W 3), it is connected to the emitter and to earth, and that the collector is connected to one winding end of the second relay (B, D) , the other winding end of which is connected to a negative voltage ( - U _b ) lies. 3. Circuit arrangement according to claim 1, characterized in that a relay (A, B; C, D) is connected in each of the emitter and collector circuits of an npn transistor (T2) operated in the base circuit, and the collector and emitter via oppositely polarized directional conductors ( G 2, G 3) are connected to the line (a, b) carrying the potential stages and the ends of the relay windings (A, B; C, D) facing away from the emitter or collector are grounded, while the base of the transistor is connected via a resistor (RV ) is connected to a negative voltage (- U _h } and is grounded via a further resistor (RZ). Considered publications:
German interpretative document No. 1 005 133. 1 sheet of drawings © 809 599/127 8.