JP3349005B2 - Common line intercom terminal reset device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a common line interphone terminal reset device, and more particularly to a common line interphone terminal reset device capable of selectively resetting only an abnormally operating intercom terminal.

[0002]

2. Description of the Related Art Conventionally, there has been proposed an intercom terminal system for a common house as shown in FIG. The controller 1 is connected to the room intercom terminals T1, T2,..., Tn via a common line L1, and to the collective entrance 9 via a communication line L2.

[0005] A circuit shown in FIG. 5 has been proposed as an intercom terminal reset device of this type of common line intercom terminal system for collective housing. In the intercom terminal reset device of FIG. 5, the carrier f1 is connected to the common line L1.
A carrier detection circuit 11 composed of a band-pass filter BPF11 for detecting 1 and a comparator CMP11 is connected. The signal output side of the carrier detection circuit 11 has a resistor R,
A reset monitoring timer 12 whose monitoring time is set in advance by a timer using the capacitor C is connected. The reset monitoring timer 12 is connected to a reset circuit 15 of the intercom terminal CPU 13. Further, a transmission data demodulation circuit 14 including a band-pass filter BPF12 for demodulating the transmission data d11 to demodulation data d12 and a comparator CMP12 is connected to the common line L1, and the transmission data demodulation circuit 14 is built in the intercom terminal CPU13. It is connected to a serial receiving circuit 16.

In such a common line interphone terminal reset device, in a normal signal receiving state, the carrier f11 superimposed on the common line L1 is output by the carrier detection circuit 11
Demodulated in the above manner, and becomes an output a having a waveform as shown in FIG. The reset monitoring timer 12 does not generate the reset output b because the cycle of the output a is shorter than the monitoring time set in advance by the resistor R and the capacitor C, so that the reset circuit 15 of the intercom terminal CPU 13 does not operate. The normal transmission data d11 is demodulated by the transmission data demodulation circuit 14 into demodulation data d12 having the waveform shown in FIG. 6, and is serially received by the serial reception circuit 16 built in the intercom terminal CPU 13 and internally converted.

Here, for example, when only the carrier is continuously transmitted to the common line L1 in order to reset the intercom terminal T1 which has caused an abnormal operation, the output a of the carrier detection circuit 11 becomes H level as shown in FIG. Fixed. When the carrier detection time generated by fixing the output a at the H level exceeds a predetermined monitoring time t ′ set by the reset monitoring timer 12, the reset output b is generated from the reset monitoring timer 12, so that the interphone The reset circuits 15 of the terminals T1, T2,.
Forcibly reset all intercom terminals CPU13.

As described above, by transmitting a carrier from the controller 1 to the common line L1 for a certain period of time, all the intercom terminals T1, T2... Tn connected to the controller 1 can be initialized.

[0007]

However, according to the conventional intercom terminal reset device, all intercom terminals T1, T2... Tn connected to the common line L1 must be reset, and a normal interphone terminal must be reset. A device that does not continuously transmit only the carrier when the terminal is calling or talking is required. Further, there is a problem that it takes time for the controller 1 to complete the initialization of all the intercom terminals T1, T2,.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and selects only an abnormally operating intercom terminal by superimposing key information for prohibiting resetting on a carrier. An object of the present invention is to provide a common line intercom terminal reset device that can be reset.

[0009]

In order to achieve the above object, a common line interphone terminal reset device according to the present invention comprises a controller for superimposing a reset prohibition key signal and sending out a carrier for carrying data, and a controller. In order to forcibly start the reset circuit of the intercom terminal CPU which has stopped functioning from the controller side, between the plurality of intercom terminals connected by a common line and centrally managed by the controller,
A carrier detection circuit for detecting a carrier from the controller;
A reset monitoring retriggerable timer connected to the carrier detection circuit that starts the reset circuit when the carrier detection time exceeds a predetermined monitoring time, and demodulates data transmitted on the common line and outputs demodulated data including a reset prohibition key signal. The intercom terminal CPU includes a serial reception circuit that serially receives the demodulated demodulated data, and a reset prohibition key signal from the serial reception circuit that is output during normal operation and not output during abnormal operation. A key information decoding circuit is included which compares the serial data with predetermined key information, outputs key data when the key data matches, and supplies the key data as a retrigger to a reset monitoring retrigable timer.

[0010]

In this common line intercom terminal reset device, in order to forcibly start the reset circuit of the CPU of the intercom terminal whose function has been stopped from the controller side,
When the controller sends a carrier on which the reset prohibition key information is superimposed, since the intercom terminal CPU is operating normally in the intercom terminal operating normally, the demodulated data demodulated by the transmission data demodulation circuit is serially received. Received serially by the circuit. The serial receiving circuit converts the demodulated data demodulated by the transmission data demodulation circuit into serial data and inputs the serial data to the key information decoding circuit. The key information decoding circuit compares the serial data with the key information, and when they match, inputs the key data as a retrigger to the reset monitoring retrigable timer. As a result, even if the continuous carrier is detected by the reset monitoring retriggerable timer, no reset output is generated because the retrigger has been performed. Therefore, the intercom terminal C
The PU can continue to operate while maintaining a normal operation state.

On the other hand, since the intercom terminal CPU does not operate in the abnormal intercom terminal, the demodulated data demodulated by the transmission data demodulation circuit is not serially received by the serial reception circuit. As a result, the serial data is not output from the serial receiving circuit, so that the reset monitoring retriggerable timer is not retriggered. Therefore, when the carrier detection time by the carrier detection circuit for detecting continuous carriers exceeds a predetermined monitoring time set by the reset monitoring retrigable timer, a reset output is generated from the reset monitoring retrigger timer. Only the reset circuit is forcibly started.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a common line intercom terminal reset device according to an embodiment of the present invention;
The common line intercom terminal reset device according to the present invention is applied to the common line multi-family housing intercom terminal system (FIG. 4), which is the same as the conventional technology. Use the same code.

As shown in FIG. 1, the common line interphone terminal reset device according to the present invention is connected to a common line L1 to which a bandpass filter BPF1 for detecting a carrier f1 and a carrier detection circuit 4 comprising a comparator CMP1 are connected. A reset monitoring retriggerable timer 5 whose monitoring time is set in advance by a timer using a resistor R and a capacitor C is connected to the signal output side of the detection circuit 4,
The reset monitoring retriggerable timer 5 is connected to the reset circuit 3 of the intercom terminal CPU2.

A band pass filter BPF for demodulating the transmission data d1 to demodulation data d2 is provided on the common line L1.
2. Transmission data demodulation circuit 6 composed of comparator CMP2
Is connected, and the transmission data demodulation circuit 6 is connected to a serial receiving circuit 7 built in the intercom terminal CPU2.
It is connected to a key information decoding circuit 8 built in the PU2. The key information decoding circuit 8 is a comparator CMP
3 and the serial data S from the serial receiving circuit 7
d is compared with predetermined key information Ki contained in the key information decoding circuit 8, and when they match, key data Kd is output. The serial data Sd
Is a reset prohibition key signal included in the demodulated data d2,
A plurality of intercom terminals T1, T2,.

The output side of the key information decoding circuit 8 having such a function is a reset monitoring retrigable timer 5.
When the key data Kd is output from the output side of the key information decoding circuit 8, the reset monitoring retriggerable timer 5 sends the retrigger R
Input as t. As a result, the reset monitoring retrigable timer 5 can be retriggered. Therefore, even when the reset monitoring retrigable timer 5 detects a continuous carrier, the reset output B is not output to the reset circuit 3.

The operation of the common line intercom terminal reset device thus configured will be described.

For example, in a normal signal receiving state, ie, all the intercom terminals T1, T2,.
In n, since the intercom terminal CPU2 is operating normally, the demodulated data d2 including the reset prohibition key signal having the waveform as shown in FIG.
Is received by the serial receiving circuit 7 built in the intercom terminal CPU2. The serial receiving circuit 7 converts the serial data Sd, which is a reset prohibition key signal included in the demodulated data d2, into a comparator C of the key information decoding circuit 8.
Input to MP3. The comparator CMP3 compares the serial data Sd with the key information Ki, and when they match, inputs the key data Kd as a retrigger Rt to the reset monitoring retrigable timer 5.

Thus, even if the reset monitor retriggerable timer 5 detects a continuous carrier such as the output A shown in FIG. 2, the reset output B is not generated because the retrigger has been retriggered by the retrigger Rt. Therefore, CPU 2 of the intercom terminal can continue to operate while maintaining a normal operation state.

On the other hand, if intercom terminal T1 is operating abnormally, intercom terminal CP
Since U2 does not operate, the demodulated data d2 demodulated by the transmission data demodulation circuit 6 is not received by the serial reception circuit 7 built in the intercom terminal CPU2. As a result, as shown in FIG. 3, since the serial data Sd is not output from the serial receiving circuit 7, the reset monitoring retriggerable timer 5 is not retriggered. Therefore, the output A (FIG. 3) of the carrier detection circuit 4 is fixed at the H level by the continuous carrier, and the carrier detection time generated by the output A at the H level is reset monitoring retriggerable.
When a predetermined monitoring time t set by the timer 5 elapses,
Since the reset output B is generated from the reset monitoring retriggerable timer 5, only the reset circuit 3 of the intercom terminal T1 is forcibly started.

As described above, the reset monitoring retriggerable
Since the timer can be controlled by a key information decoding circuit built in the intercom terminal CPU, it is possible to selectively reset only the intercom terminal that is abnormally operating or stopped without affecting the intercom terminal that is operating normally. Can be.

In the above-described embodiment, the intercom terminal for a multi-family house has been described. However, the present invention is not limited to this, and it may be a common line type hospital intercom or an emergency call system terminal, or a terminal device by wireless communication. Good.

[0022]

As is apparent from the above description, according to the common line intercom terminal reset device of the present invention,
Since the intercom terminal that is operating normally and the intercom terminal that is operating abnormally or stopped can be distinguished, only the interphone terminal that is operating abnormally can be reset. Further, since the intercom terminal is not reset more than necessary, the initial communication process with the controller is reduced, and the time required for the common line to return to the normal state can be shortened. Further, it is possible to reset only the intercom terminal that is running away while another intercom terminal is in a call, despite being a common line.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a common line intercom terminal reset device according to the present invention.

FIG. 2 is an operation waveform diagram when the intercom terminal of the common line intercom terminal reset device according to the present invention is in a normal state.

FIG. 3 is an operation waveform diagram when the intercom terminal of the common line intercom terminal reset device according to the present invention is in an abnormal state.

FIG. 4 is a block diagram showing an intercom terminal system for a common line type apartment house.

FIG. 5 is a configuration diagram showing a conventional common line intercom terminal reset device.

FIG. 6 is an operation waveform diagram of a conventional common line intercom terminal reset device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Controller 2 ... Interphone terminal CPU 3 ... Reset circuit 4 ... Carrier detection circuit 5 ... Reset monitoring retriggerable timer 6 ... Transmission data demodulation circuit 7 ... Serial receiving circuit 8 ... Key information decoding circuit T1, T2 ... Tn ... Interphone terminal L1 ... .... Common line Sd ... Serial data Ki ... Key information Kd ... Key data Rt ... Retrigger d2 ... Reset prohibition key signal Demodulated data including

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04M 9/00-9/10

Claims (1)

(57) [Claims] 1. A controller (1) for superimposing a reset prohibition key signal and transmitting a carrier carrying data, and a plurality of interphones connected to the controller by a common line (L1) and centrally managed by the controller. In order to forcibly start the reset circuit (3) of the intercom terminal CPU (2) whose function has been stopped from the controller side between the terminals (T1, T2... Tn), the carrier from the controller is detected. A carrier detection circuit (4) connected to the carrier detection circuit, a reset monitoring retrigable timer (5) connected to the carrier detection circuit for starting the reset circuit when the carrier detection time exceeds a predetermined monitoring time, and transmitted on the common line. by demodulating a data transmission data demodulation circuit (6) and Bei the outputting the demodulated data (d2) containing the reset inhibit key signal
The intercom terminal CPU has a serial receiving circuit (7) for serially receiving demodulated data and a normal receiving circuit.
The serial data (Sd), which is the reset prohibition key signal from the serial receiving circuit, which is output during operation and not output during abnormal operation, is compared with predetermined key information (Ki). And a key information decoding circuit (8) for outputting the reset monitoring retrigable timer as a retrigger (Rt).
A common line intercom terminal reset device characterized by being incorporated .