DE2251608C3 - Transmit and receive device with a common transmit / receive filter for data transmission - Google Patents

Description

a receiver to a both sender and io

filter serving as reception filter «

are concluded that with the help of one in particular
from non-overlapping switchable amplifier

levels existing electronic switch The invention relates to a transmission and reception ία dependency on a transmitting or receiving device for data transmission with a transmitter and receiving advice of the transmitting / receiving device and with a receiver in which the transmission and characterizing Control criteria are either the same size as the receiving frequency and can be switched on to a first connection or to a second connection and the same point in time, either only the connection being sent or only being received and with a transmitter being on the incoming or outgoing part ao and a receiver are connected to a filter serving both as a transmission and a four-wire transmission path or a common reception filter The transmitter (5) and the receiver (6) de n, electronic changeover switch coupled to one another at the input of the filter as one is the readiness to send or receive and that the receiver can be blocked by the terium (St) characterizing the control criterion. Control criterion optionally to a first connection

2. Transmitting and receiving device can be connected to or connected to a second connection, which means 1, characterized in that the Sen- at the connections in each case on the incoming or the (6) with high output resistance and 30 outgoing part of a four-wire transmission path embossed output current and the receiver or together on a two-wire transmission path (5) with high input resistance and can be connected.

Embossed input voltage are operated and such transceiver devices can

that the connection of the receiver (5) and in particular are used in substations of

Transmitter (6) to two pairs of connections one on his 35 telecontrol systems, in which several stations over

connected to one and the same line or via a conference

fits closed transmitter of the filter line are connected to each other, via the conference

is exchangeable. remote line to receive remote control signals

3. Denial of sending and receiving equipment after announcements or reports to the conference management 1 or 2, characterized in that the 40 give.

Amplifier of the electronic changeover switch It is often common in telecontrol equipment to

Current negative feedback push-pull circuits in from several to one and the same conference line

Basic emitter circuits in which the connected substations are e.g.

Emitter each via an emitter resistor calling procedure only one single transmission

(13, 14 or 23, 24) each to be issued to a tax pundit 45. For this purpose, in

are tial. such telecontrol devices control criteria

4. Transmitting and receiving device according to education, which has a transmission authorization or a readiness to receive 3, characterized in that characterize the control shaft of the relevant station. this erpotentials through the collector potentials of the z. B. in the circuit arrangement for the transmitter two-stage control circuit contained, 50 genes of signals via a common signal source side, in particular directly, at the reference point in remote control systems according to the German On the potential (-) and collector side, this is the case each via an interpretation document 1 169 009.

Resistance to supply voltage (+) led- In the case of transmit and receive circuits of the above

th transistors (81, 32) are formed, of the type described in more detail are generally a

A first transistor (81) at the base with 55 separate transmit and receive filters is required.

the control criterion (St) is controllable and the Ba-

sis of the second transistor (82) at the tap of a th downsizing of the devices to difficulties

Collector voltage divider (85, 86) of the first can lead. A send and receive message has already been

Transistor (81) is located. interception device with a transmitter and with a

5. Transmitting and receiving device proposed by 60 recipients (P 2119 411.6-32), at one of claims 1 to 4, characterized either only at one and the same point in time indicates that a is sent or only received on the part of the transmission, and at the one tot on the filter (3) lying transmitter (9) to the transmitter downstream transmission filter and a dem equal to the output transmitter of the receiving side receiver upstream receiving filter provided amplifier stage (1) and input transformer 65 are hen. The transmitter and receiver are over the transmitter-side amplifier stage (2) of the electronic a hybrid circuit to both a transmitter and niche switch is. also connected as a reception filter

6. Transmitting and receiving device according to sen, using an electronic switch

^ ₁ depending on a control criterion that evaluates the send / receive device to be ready to send or receive, it is optionally connected to a first connection or to a second connection, whereby the connections are each connected to the incoming or outgoing part of a Yier wire transmission path or jointly Advertise two-wire transmission path connected. With the help of a control criterion,

which in a remote control device leads to 10 anyway, h ähd d Sd i Di

catching device can be adapted particularly easily to different line levels without the possibly In addition, the calibrated setting of the switching amplifier needs to be changed.

In a further embodiment of the invention, the transceiver is designed such that the amplifier stages are negative-current push-pull circuits in the basic emitter circuit each of which the emitter is connected to a control potential

Is available while a telegram is being sent the outgoing line or the incoming line while the line is ready to receive connected to the filter and disconnected the line that is not required. The fact is that at one and the same time either only sending or only receiving is used, with a common transmit-receive filter get along. Furthermore, the invention is illustrated in the figures illustrated exemplary embodiments explained in more detail. It shows

F i g. 1 is a block diagram and

F i g. 2 is a circuit diagram of a transceiver device with a receiver input that can be switched off.

For the transmission of message and command telegrams in telecontrol systems you can z. B. un-

strengthened four-wire or two-wire lines, advancing and outgoing lines see a large »o. The ones issued by a telecontrol station Achieve return loss that allows the DC signs to be accordingly

F i g. 1 on the transmission side by means of a signal transmitter 6, e.g. in amplitude-modulated 3000 Hz characters implemented and fed into the outgoing line F1 »5. A signal receiver is set on the receiving side 5 converts the incoming 3000 Hz characters back into direct current characters and outputs them Evaluation on a not shown in the figure

g g

provided telecontrol device. From several to the

hi SdE

The object of the invention is to provide a transmitting and receiving device as described in more detail above Bibhle d Vil

Transceiver device also in larger telecontrol systems with a large number of stations are connected to one and the same transmission path or to a conference line.

An embodiment of the device according to the older proposal offers the possibility of a light one Adaptation to different line levels.

Such a transmitting and receiving device

can be implemented with relatively little effort 30 line-connected similar send / receive and offers a wide range of possible uses, there is only one in the figure

shown.

The circuit according to FIG. 1 contains the genera-

_where ^ tor 7 with the transmitter containing the transmitter modulator

Neten type while maintaining the advantages mentioned 35 of FIG. 6, the signal receiver 5, the transmitting and receiving With regard to low effort and operational reception bandpass 3, switching security on the send and receive side to perfect further. amplifiers 1 and 2 with line transformers 16 and

The transmitter and the receiver can be directly 26. The bandpass filter 3 serves as a transmission filter for the pulse control connect to the transmit and receive filter, shaping. As a reception filter, it also filters the provided that this is the 40 arriving within the signal channel, connected to the receiver Evaluation device allows. This is, for example, signals and transmits them without further deformation. Signals from other signal channels, voice frequencies or out-of-band interference are blocked.

The electronic changeover switch is formed by the two switching amplifiers 1 and 2, which can be mutually blocked by the control criterion St of a telecontrol station not shown in detail in the figure. Since the amplification of the respective unlocked amplifier is fully available, the output stage of the transmitter can be used for this

45

then the case when a downstream remote control device only responds to character telegrams that contain the address of the relevant station.

According to the invention, the transceiver is designed such that the transmitter and the receiver are coupled to one another at the input of the filter and that the receiver u through the Control criterion is lockable. A lockable amplifier stage at the input of the is used for this purpose Recipient.

These measures result in a transceiver that meets the demands placed on it fulfilled in a particularly easy to implement way and in which the receiver output from the transmitter is decoupled.

In a further development of the invention, the transmission stage and the input stage of the receiver 5, in particular the first stage of an input amplifier is omitted.

Without control voltage St , amplifier 2 is blocked; the amplifier 1 is permeable. An on incoming part Fl of the four-wire transmission paths _a incoming ßOOO Hz characters step arrives

Receiving device designed such that the input transformer 16, after amplification Transmitter with high output resistance and connected to switching amplifier 1, to bandpass filter 3 and further stamped output current and the receiver with ho- to signal receiver 5. Here the signal continues hem input resistance and impressed input - amplified, rectified and controlled, according to a Voltage are operated and that the connection correction of the level-dependent step length in a the receiver and the transmitter to two connection control circuit, one via a Schmitt trigger pairs one on rare of the transmitter and receiver 63 output transistor. This gives over the line £ lying, adapted closed transmitter of the reference potential to the telecontrol device. Filters is interchangeable. By means of these measures, the center of the emitter resistors 53, 54

there is the advantage that the transmission and reception is carried out via the collector of the

switched controls transistor 82 to minus potential. a 2 or aS, which allow the transformer, if

When switching the device to send via the wishes to also act as a simple line transformer Control line St will now drive through the control circuit.

82, 83, 84 of the receiving amplifier 1 and the emp- The emitter of transistor 11 is on the

catcher entrance blocked at the same time. 5 resistor 13, the emitter of transistor 12 across

When the telecontrol station sends a telegram the resistor 14 to the collector of the transistor

wants, she enters an 82 run in the telecontrol device anyway. The emitter of transistor 21 is above

already for other purposes, in particular for the character of the resistor 23, the emitter of the transistor 22

terization of a transmission link or ready to receive - via the resistor 24 at the collector of the transit

shaft, existing control criterion on the line io stors 81.

St, which blocks the switching amplifier 1 and the blocking The resistors 13 and 14 are stepped

tion of the switching amplifier 2 cancels. The receptively adjustable resistor 15, the resistors

gerS contains a switching amplifier 23 and 24 as the input stage, which can be set in stages

ker, with the help of which he bridges with the presence of authorization to send resistance 25, so that the amplifier

nis is blocked by the control criterion. 15 the switching amplifier can be adjusted.

Instead of the switching amplifier, it is also possible to use the control potentials for the two switching amplifiers

whose electrically controllable switches are provided and 2 are thereby through the collector potentials

the one that may be contained in a two-stage control circuit at another point in the receiver.

catcher, e.g. B. be arranged at the receiver output NEN, emitter side directly at the reference potential

can. ao "-" and on the collector side each via a resistor 84

The transmitter 6 is now ready for operation and the remote or control station 87 connected to the supply voltage "+" can send its telegram over the line S Transistors 81, 82 are formed. The first transistor 81 give to transmitter 6. The transmitter 6 contains a transmitter at the base through the control criterion Si control demodulator, which controls the 3000 Hz voltage of the genebar. The base of the second transistor 82 is on rators7 keys. The keyed 3000 Hz tone comes »5 tapping of a collector voltage divider of the first via the bandpass filter 3 after amplification in the switching transistor 81. This collector voltage divider amplifies 2 via the output transformer 26 to the distance from the resistors 85 and 86. going part Fl of the four-wire transmission path. The arrangement of the two switching amplifiers between

After the end of the telegram, the telecontrol device takes filter 3 and lines of the four-wire transmission

control voltage St away. The switching amplification path offers advantages for the adaptation of the

Ker 2 is blocked, the switching amplifier 1 and the in the device to the different line types and types

ReceiverS contained switching amplifier permeable. gel. So the non-constant apparent resistance is The receiver 5 is ready to receive again. course of the bandpass filter 3 through the switching amplifier With the incoming part Fl of the four-wire over- against the line decoupled. Furthermore, the

Tragungsweges incoming remote sign or 35 send-side output A 1 and the receive-side

other voltages cannot go to the outgoing input El, which is directly connected to the transformer

Part of the four-wire transmission path arrive, there are, designed for high internal resistance and there-

both when sending and when receiving, always one forward in an advantageous manner in parallel to one on both sides

Switching amplifier is blocked. This results in a line terminated with 600 Q

particularly high blocking attenuation. 40 den. For connecting the device at the end of a

In the case of the in FIG. 2, the internal resistance is set by turning on the direction, the switching amplifiers 1 and 2 have one of the resistors 17 and 27 set to 600 Ω, common transmitter 9, which is also output possible as wire line. For this purpose, the input E1 is also the input transformer of the transmitting side 45 (connections a 2 and a 3) and the output A 1 (amplification stage 2 is. This transformer 9 is with a key α 5 and α 4) to be connected in parallel and with a winding to which the capacitor 92 is connected to the line. The switching amplifier 1 is, at the same time on the bandpass filter 3 and on the collectors and 2 hereby take on the function of a two-wire amplifier contained in the switching amplifier 1 with a feedback lock. The in-U and 12th transformer 9 and capacitor 92 can also be included in the bandpass filter 3 in this mode of operation. high resistance or adjustable to 600Q. For setting

Another winding of the transformer 9 is to the development on high resistance, the resistors 17 and Basic connections of the separated in the second switching amplifier 2 27 The setting to 600 Q is made

contained transistors 21 and 22 out. by that nor one of the two resistors 17 and

The base terminals of the transistors 11 and 12 55 27 is turned on.

are connected to the symmetrical secondary winding of the For a further connection option are the

Transformer 16, the collectors of the transistors 21 line transformers 16 and 26 as asymmetrical «

and 22 formed on the symmetrical primary winding of the fork

Transformer 26 connected. Interception device with low resistance in a four-wire wire

The input transformer 16 of the receiving-side 60 device are looped in, at which other Ge Amplifier stage 1 and the output transformer 26 of the rate, e.g. B. service facilities, connected

Amplifier stage 2 on the transmit side are each as Ga- are. In the case of two-wire lines, both are fork designed to be connected in series as part of a fork-type transmitter,

circuit for connecting a service device. The adaptation to the line level or An

The transformer 16 forms together with the simulated switching level is also in the switching amplifiers

dung 18, the carrier 26 together with the post and 2 made. By changing the opposite

formation 28 each a hybrid circuit. coupling, with the help of solder bridges. Step switch!

Both transformers 16 and 26 bet.ii / cn λπΜτίιΙιΚ'.ε odor Drchwklcrxt «indcn 15 and 25, the Vci

7 8

Strengthening both the transmission side and the reception output stage shown, which has a modulator or

The receiving side and thus the transmission level or the receiving amplifier circuit can be. The outgoing

sensitivity of the receiver to the respective amplifier stage contains the transistors 61 and 62, the

adjust the conditions. across the emitter resistors 63 and 64 passing through

The circuit is expediently so 5 the potentiometer 65 are bridged together

dimensioned so that reference potentials "-" are carried when sending and receiving. The collectors

of the Femffektzeicben approximately the same level on the transistors 61 and 62 are to the soldering pins a

Transmit / receive filter 3 is located and thus filters 3 and h are performed,

is operated in the most favorable working area. In the case of the transceiver, normal

With the help of the input stage of the receiver 5, the signal level is ensured to -0.9 Np on the relay, that the receiver is set to the inherent level 0, i. H. to a level of -0.9 NpmO Transmitter coming 3000 Hz characters not turned on. When using the line at the same time, together with other transmission systems, e.g. B. to-

About the windings 42 and 43 of the transformer 4 together with a device for transmitting

the transmitter output and the receiver input are 15 business calls up to 2400 Hz, or if there are several

coupled to the filter. The transmitter 4 becomes telecontrol channels with different signal frequencies

expediently included in the bandpass filter 3. zen, however, it may be necessary to adjust the signal level

The winding 41, together with the condenser, forms the level proposed by CCIT for this purpose

Sator 93 a resonant circuit of the filter 3. Lower the resistance - 1.7 NpmO. The transmitter must then be on

stand 47 closes the filter accordingly. ao a send level lower by 0.8 Np and at the same time

The transformer 4 has the winding 41 and the receiver has an emp symmetry winding that is 0.8 Np higher 42 and 43. The symmetry sensitivity can be switched. Such a one Winding 43 is part of winding 42 and is switching the transmitter and receiver to two the signal level between two taps can be used in a simple manner with the aid of Formed winding part. On the other hand, it can also make short-circuit bridges that are soldered into the Symmetry windings are provided. pins are used. For this purpose, the

The winding 42 is attached to the soldering pins g and c . The number of turns 42 and 43 is dimensioned in such a way that the

closed. Your center tap is at the connection ratio, the value 2.23 accordingly

connection point of resistors 45 and 46. This is 0.8 Np.

series formed from resistors 45 and 46 30 For the signal level -0.9 NpmO the transmission

circuit to the supply voltage + / - 1 / on - the reasonable 6 via the shorting bars a-c and g

closed. The symmetry winding 43 lies against that of the winding 42 with the high number of turns and

Solder pins b and /. the receiver 6 via the short-circuit bridges b - d

In the figure, only part of the receiver 5 and e - / on the winding 43 with the low wind

Entrance level shown. This is a push-pull number.

circuit with the transistors 51 and 52 formed with the switch to signal level - 1.7 NpmO det. The transistors are in the emitter basic circuit, the two windings 42 and 43 are switched interchanged and connected via the emitter resistors 53, so that the transmitter 6 is now via the and 54, which are connected to the collector of the transistor 82 short-circuit bridges a -fa and f - h on the low leads are coupled. To adjust the gain 4 ° and the receiver via the short-circuit bridges, the resistors 53 and 54 are due to the potential c - d and e - g because of the high number of turns,
meter 55 bridged. The base connections of the tran- If the output transistors 51 and 52 connected to the transformer 4 are connected to the soldering pins d and e, the input stage has a high output resistance and includes the imprinted collector current and the input stage

The DC operating points of the input stage 45 with high input resistance and impressed Ba-

and the output stage are designed in such a way that the gal- sis-emitter voltage is operated, it turns out to be

vanic connection via the transformer winding to the respective transmission level the corresponding receive

42 and the winding 43 contained therein is possible. ranger sensitivity inevitably.

Via the resistors 45, 46 and the center point The level switching provided on the transformer 4

the winding 42 is the appropriate DC voltage 50 device has the advantage that it is at the switching

for the base connections of the transistors 51, 52 and amplifiers, the setting to be made is depending on the

the collectors of the transistors 61,62 supplied. connection level of the line, the given

Only part of the transmitter 6 is shown in the figure, and if it is calibrated, it is not changed.

1 sheet of drawings

Claims (1)

one of claims 1 to 5, characterized in that the input transformer (16) of the p receiving-side amplifier stage (1) and the 1. Transmitting and receiving device for the data output transmitter (26) of the transmission-side transmission with a transmitter and with a 5 stronger stage (2) of the electronic switch receiver, in which the transmitting and the Erap are each designed as a fork transmitter and the capture frequency are the same and to one and part of a hybrid circuit for the connection at the same time either only sent or a service device. is only received and at which a transmitter and