FR2677468A1 - SYNCHRONIZATION DEVICE FOR A TIMER. - Google Patents

Abstract

The device uses a time signal which is received by radio and which is converted into digital analyzable pulses. The pulses (1) are collected in an analysis circuit (4), are converted there into a compressed time telegram, and this compressed time telegram is transmitted to a timer (11) via an interface ( 10).

Description

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continue from the network.

  The control of the dissipator is therefore carried out again at a correct time if the network is available again and if it is again possible to decode the real time on which the timer is then set. It has also already been proposed, if there are not sufficient possibilities for receiving long waves at the place of installation of a radio clock, to set up a receiving device in a central location favorably located for this use. A synchronized coupling stage, located between the local network and the conversion receiver or between the local network and the display receiver, is then designed so as to be directly integrated into the connection to the network to operate the transfer receiver or for operating the timer However, in this device, the network is permanently occupied for the transmission from the receiver to the timer, so that it cannot be used for other transmissions. The object of the invention is to provide a synchronization device for a timer, so that the radio signals received for the setting are not continuously transmitted to the timer by

through the network.

  This object is achieved according to the invention in that the time pulses are collected in an analysis circuit, are converted there into a compressed time telegram, and this compressed time telegram is transmitted to a timer via of an interface. The advantage of the invention lies in the short-term stress on the network and in security against disturbances, since the transmission of a compressed time telegram, which is obtained from the normal radiotelegram, is carried out by space of a fraction of a minute In this case, the time telegram is transmitted, preferably, several times consecutively to increase the

security.

  According to the invention, the coding devices are assigned to the analysis unit. The transmission of the compressed time telegram is carried out by means of a two or three-wire interface, by means of modulation and of a demodulation through

from a network or by radio.

  According to the invention, this transmission takes place several times, in particular four successively, per transmission cycle. The transmission time interval and the transmission speed can be chosen. The compressed time telegram begins after a start mark with at each time a pause, a "low" bit being provided as the start of the telegram. The invention will be explained in detail below with reference to an exemplary embodiment. In the corresponding drawings are shown: FIG. 1, a block diagram of the adjustment device; Figure 2, a pulse diagram of a

compressed time telegram.

  To explain the adjustment device, we

  serves as the block diagram shown in Figure 1.

  The signals 1 from DCF 77 arrive, via an HF element 2 or an antenna, at a known integrated switching circuit 3 in which the signals from DCF 77 are converted into digital pulses From switching circuit 3, the digital signals reach an analysis circuit 4 which, the

  if necessary, can be performed by a microprocessor.

  Simultaneously, the digital pulses are transmitted to a display device 5, the display being carried out, in the simplest case, by means of a light-emitting diode

(LED) green.

  By means of a first coding device 6, a coded transmission rate can be entered in the analysis circuit 4 A second coding device 7 determines the time interval between transmissions

  that the analysis circuit 4 be delivered.

  The DCF 77 signal transmitter transmits 59 DCF 77 signals per minute which, apart from time and date information, also contain parity bits. These signals digitized in switching circuit 3 are collected in analysis circuit 4 and are subject to a plausibility check If the 59 signals from DCF 77 per minute have been correctly received, they are converted into a compressed telegram The compressed telegram contains the same information as the signals of the DCF transmitter 77 The analysis circuit 4 is associated with a second display device 8 which can be produced with a red light-emitting diode (LED) Downstream of the analysis circuit 4 is also connected an output unit 9 which acts on a interface 10 which is then transmitted to the timer 11 As indicated, the 59 pulses of DCF 77 received per minute are collected in the analysis circuit 4 or in a microprocessor occupying such a function If the microprocessor detects the minute mark, which is expressed by a DCF 77 pulse missing in the 59 second, the DCF 77 pulses collected per minute are checked to determine if 59 pulses are present, the length of the different pulses coincides with a range of tolerance, the boot bit is "High ',

the parity bits are correct.

  If the 59 pulses are correctly received, of the 59 pulses, 44 pulses containing the time information are output 4 times successively in compressed form The first pulse is always output with the start mark "Low". Via the device coding 6, 7 are fixed, on the one hand, the baud rate, which can be, for example, 100 bd or also 1200 bd, and, on the other hand, the interval between each of the quadruple transmissions compressed time telegrams In this case, one can choose, for example,

  between 2 minutes, 10 minutes, 1 hour or even 24 hours.

  Regardless of this setting, 3 after the network is put into service, if all 59 pulses from DCF 77 have all been received correctly, the quadruple transmission of the time telegram is carried out 4 times at 2-minute intervals. chooses an interval of 24 hours, at the end of the commissioning of the network, a 24-hour counter is initialized during the first quadruple transmission of the time telegram In this case, the transmission interval is set so that, taking into account the radio pause, the telegram transmission always takes place around 3 am in undisturbed reception If the microprocessor does not receive pulses from DCF 77 for more than 1 minute, the microprocessor goes to the state of reset, which has the effect of resetting the contents of all

memories.

  If the 59 pulses from DCF 77 are received correctly again, the time telegram is immediately transmitted 4 times in compressed form,

  as during the commissioning of the network.

  The display devices 5, 8 are used for the display of the operation, namely that the green LED flashes, when the signals from DCF 77 are received, at a rate of 1 time per second The red LED is always on for approximately 10 seconds when the compressed time telegram is transmitted To test the entire device or set the clock directly, there is a separate call stage from the transmitter If this key is pressed, a compressed time telegram is immediately transmitted four times, regardless of interval coding

of time between transmissions.

  Figure 2 shows the shape of the signal

  quadruple compressed time telegram.

  D denotes the bit duration, a pulse length of 1/4 of the bit duration corresponding to a 'Low' bit and a pulse duration of 3/4 of the

  bit duration corresponding to a 'High' bit.

  The duration of bit D corresponds to the set baud rate A first bit 'Low' 13 represents the start mark 12 The start mark 12 is followed by a pause 14 which corresponds to a duration of bit D A bit 'Low "t next indicates the start of telegram 15 which is followed by the first telegram 16 1 After the first telegram 16 1 again comes a pause 14 and a start of telegram 15 The four telegrams 16 1

  to 16 4 are transmitted in this order.

  Finally, it should be noted that the entire device is intended in particular to be set up

7 2677468

  works in a stove timer, even if

  other application cases are possible.

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  many times, especially four times

  successively, per transmission cycle.

  8 Synchronization device according to one

  any of the preceding claims, characterized

  in that the transmission time interval and the

  transmission speed can be chosen.

  9 Synchronization device according to one

  any of claims 1 and 3 to 8, characterized

  in that the compressed time telegram (16) starts after a start mark (12) with a pause (14) each time, a "Low" bit being provided as the start of

telegram (15).