JP3349006B2 - 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 resetting only a terminal in which communication is disabled.

[0002]

2. Description of the Related Art Conventionally, there has been proposed an intercom terminal system for a common line apartment house as shown in FIG. The controller 1 is connected to the room intercom terminals T1, T2 to Tn via a common line L1, and to the collective entrance apparatus 10 via a communication line L2.

A circuit shown in FIG. 4 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. 4, a carrier detection circuit 11 for detecting a carrier is connected to the common line L1, and a monitoring time is set in advance on the output side of the carrier detection circuit 11 by a timer using a resistor R and a capacitor C. The reset monitoring timer 12 is connected to the
2 is connected to the reset circuit 15 of the intercom terminal CPU13. A transmission data demodulation circuit 14 for demodulating transmission data to demodulated data is connected to the common line L1. The transmission data demodulation circuit 14 is connected to a serial reception circuit 16 built in the intercom terminal CPU 13.

In such a common line type intercom terminal reset device, for example, when transmission data is transmitted from the controller 1 to the intercom terminal T1, if the intercom terminal CPU 13 of the intercom terminal T1 goes out of control, the transmission data demodulation circuit 14 The demodulated data demodulated in step (1) cannot be received by the serial receiving circuit 16 built in the intercom terminal CPU 13. In this case, the controller 1 repeats the retransmission processing of the transmission data. However, since the intercom terminal CPU 13 of the intercom terminal T1 is running out of control, the demodulated data demodulated by the transmission data demodulation circuit 14 is incorporated in the intercom terminal CPU 13. Serial reception cannot be performed by the serial reception circuit 16. At this time, the carrier is output from the controller 1 for a certain time.

The carrier output for a predetermined time is detected by a carrier detection circuit. When the carrier detection time exceeds a predetermined monitoring time set by the reset monitoring timer 12, the reset monitoring timer 12 sends a reset signal to the reset circuit 15. Is output. By this operation, the intercom terminal CPU 13 is reset, and the intercom terminal T1 is reset.
Can return to a normal state.

[0006]

However, according to the conventional intercom terminal reset device, when a carrier is transmitted from the controller 1 for a certain period of time or more, for example, to reset the intercom terminal T1 which is operating abnormally, , The intercom terminal T2 performing normal operation ...
There was a disadvantage that reset was also applied to Tn.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem. By adding a circuit capable of avoiding resetting by a carrier to each intercom terminal, all intercom terminals can be controlled by a carrier. It is an object of the present invention to provide a common line intercom terminal reset device that is not reset unconditionally.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, a common line intercom terminal reset apparatus according to the present invention transmits a carrier for reset when one of a plurality of intercom terminals stops functioning. A controller that transmits data as a reset command and then outputs a carrier that carries the data for a certain period of time and a plurality of intercom terminals connected to the controller by a common line and centrally managed by the controller. In order to forcibly start the reset circuit of the intercom terminal CPU whose function has been stopped from the side, a carrier detection circuit for detecting a carrier from the controller, and a predetermined detection time which is connected to the carrier detection circuit and detects the carrier detection time. A reset monitoring timer that outputs a reset signal after a lapse, and a reset transmitted on a common line And a transmission data demodulation circuit for demodulating a command data, the intercom terminal CPU,
When the intercom terminal CPU is normal, a serial receiving circuit that serially receives demodulated demodulated data and outputs serial data that is a reset command, a serial command that is a reset command from the serial receiving circuit and a predetermined reset command And a reset command decode circuit that outputs a switch OFF signal when they match, and turns off the switch by the switch OFF signal to prevent the reset signal from being output to the reset circuit and stops the intercom terminal CPU from functioning. When the carrier detection circuit detects the carrier and the carrier detection time detected by the reset monitoring timer exceeds a predetermined monitoring time, it is necessary that the controller transmits a carrier for reset before the intercom terminal stops functioning. Resetco to tell The carrier detection circuit does not detect the carrier because the data and the carrier as the command are not output, and the switch ON signal output from the carrier detection circuit is input and the reset signal is transmitted to the reset circuit through the switch that is turned ON. Is provided.

[0009]

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 a carrier is transmitted from the controller, since the intercom terminal CPU is operating normally in the intercom terminal operating normally, the data demodulated by the transmission data demodulation circuit is serially received by the serial reception circuit. The serial receiving circuit converts the data demodulated by the transmission data demodulating circuit into serial data, and inputs the serial data to the reset command decoding circuit. The reset command decode circuit compares the serial data with the reset command,
When they match, a switch OFF signal is input to the switch circuit. At this time, the reset monitoring timer is started when the carrier detection time detected by the carrier detection circuit has passed a predetermined monitoring time, but the switch circuit is turned off by the switch OFF signal from the reset command decode circuit.
Therefore, the reset circuit of the intercom terminal CPU is not started.

On the other hand, in the intercom terminal in an abnormal state, the intercom terminal CPU goes out of control, so that the data demodulated by the transmission data demodulation circuit is not received by the serial reception circuit. As a result, serial data is not output from the serial receiving circuit, and the switch circuit holds the ON state. Therefore, the reset monitoring timer is connected to the reset circuit, so that only the abnormal intercom terminal can be forcibly reset.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a common line intercom terminal resetting apparatus according to an embodiment of the present invention applied to a common line intercom housing intercom terminal. Since the common line intercom terminal reset device according to the present invention is applied to the same common line interfamily housing intercom terminal system (FIG. 3) as the prior art, the common line interfamily housing intercom terminal system of the present embodiment is also applied. Use the same code.

In the common line interphone terminal reset device according to the present invention, as shown in FIG. 1, a carrier detection circuit 4 for detecting a carrier is connected to a common line L1, and one output side of the carrier detection circuit 4 is connected to one output side. A reset monitoring timer 5 whose monitoring time is set in advance by a timer using a resistor R and a capacitor C is connected. The reset monitoring timer 5 is connected via a switch circuit 6 to the intercom terminal CPU.
2 reset circuit 3.

A switch ON terminal S of the switch circuit 6
Is connected to the other output side of the carrier detection circuit 4, and a terminal R for switch OFF is connected to an intercom terminal CP described later.
It is connected to the output side of a reset command decode circuit 9 built in U2. For such a switch circuit 6, for example, a flip-flop circuit as shown in FIG. 2 is used. Hereinafter, the present embodiment will be described using the flip-flop circuit 6.

A transmission data demodulation circuit 7 for demodulating transmission data to demodulated data is connected to the common line L1, and the transmission data demodulation circuit 7 is connected to the intercom terminal CP.
It is connected to a serial receiving circuit 8 built in U2, and the serial receiving circuit 8 is further connected to a reset command decode circuit 9 built in the intercom terminal CPU2. The reset command decode circuit 9 has a comparator CMP, compares the serial data Sd from the serial reception circuit 8 with a predetermined reset command Rc built in the key information decode circuit 8, and when they match, the switch circuit 6 To output the switch OFF signal Soff. The serial data Sd is a reset command for transmitting a carrier for reset, and is transmitted from the controller 1 that centrally manages a plurality of intercom terminals T1, T2 to Tn.

Since the output side of the reset command decode circuit 9 having such a function is connected to the switch OFF terminal R of the flip-flop circuit 6 as a switch circuit, the output side of the reset command decode circuit 9 When the switch OFF signal Soff is output, the switch SW of the flip-flop circuit 6 is turned off. Further, since the switch ON terminal S of the flip-flop circuit 6 is connected to the other output side of the carrier detection circuit 4, the switch ON signal Son output when the carrier detection circuit 4 stops detecting the carrier. Thus, the switch SW in the flip-flop circuit 6 can be turned on. Therefore, the flip-flop circuit 6 normally has the switch SW in the ON state.

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

For example, from the controller 1 to the intercom terminal T1
If intercom terminal CPU2 of intercom terminal T1 cannot receive data in a runaway state when data is transmitted to controller 1, controller 1 starts data retransmission processing. But,
When intercom terminal CPU2 is in a runaway state, intercom terminal T1 cannot receive data no matter how many times the retransmission process is performed. At this time, the controller 1 detects the abnormality of the intercom terminal T1, and all the intercom terminals T1, T1
(2) Data is transmitted as a reset command notifying that a carrier for reset is to be transmitted to Tn from now on, and thereafter, the carrier is output for a predetermined time. The carrier is detected by the carrier detection circuit 4. When the detection time of the carrier detected by the carrier detection circuit 4 exceeds a predetermined detection time set by the reset monitoring timer 5, the reset monitoring timer 5 sends the flip-flop circuit 6. Output a reset signal.

In such a state, the intercom terminals T2... Tn that are operating normally operate the intercom terminal CPU2 normally, so that the reset command from the controller 1 demodulated by the transmission data demodulation circuit 7 is used as the reset command. Is serially received by the serial receiving circuit 8 built in the intercom terminal CPU2. The serial receiving circuit 8 outputs the serial data Sd
To the comparator CM of the reset command decode circuit 9
Input to P. The comparator CMP compares the serial data Sd with the reset command Rc, and inputs a switch-off signal Soff to the flip-flop circuit 6 when they match. As a result, the reset signal from the reset monitoring timer 5 is not output to the reset circuit 3 built in the intercom terminal CPU2, so that the intercom terminals T2.
Is not reset.

On the other hand, in the intercom terminal T1 in the abnormal state, since the intercom terminal CPU2 runs out of control, the data as the reset command from the controller 1 demodulated by the transmission data demodulation circuit 7 is transmitted to the intercom terminal CPU2. It is not received by the built-in serial receiving circuit 8. As a result, the serial data Sd is not output from the serial receiving circuit 8, so that the switch SW of the flip-flop circuit 6 holds the ON state. Therefore, since the reset signal from the reset monitoring timer 5 is input to the reset circuit 3, only the intercom terminal T1 can be forcibly reset.

As described above, the switch circuit connected to the reset monitoring timer is turned on and off by the reset command decode circuit built in the intercom terminal CPU.
Therefore, it is possible to selectively reset only the intercom terminal having a malfunction such as runaway without affecting the intercom terminal that is operating normally.

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 has a malfunction such as runaway can be distinguished, only the intercom terminal that has a malfunction such as runaway can be reset.

[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 explanatory diagram of a flip-flop circuit used in the common line intercom terminal reset device according to the present invention.

FIG. 3 is a block diagram showing an intercom terminal system for a common line type apartment house.

FIG. 4 is a configuration diagram showing a conventional common line intercom terminal reset device.

[Explanation of symbols]

 1 ... Controller 2 ... Interphone terminal CPU 3 ... Reset circuit 4 ... Carrier detection circuit 5 ... Reset monitoring timer 6 ... ... Flip-flop circuit (switch circuit) 7... Transmission data demodulation circuit 8... Serial reception circuit 9. ······· Interphone terminal L1 ······················································································································ Serial data ... Reset command

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04M 9/00-9/10

Claims (1)

(57) [Claims] A plurality of intercom terminals (T1, T2 ... T)
a controller (1) for transmitting data as a reset command notifying that a carrier for reset is transmitted when one of the functions of n) stops functioning, and thereafter outputting a carrier carrying the data for a certain period of time; And the common line (L
In forcibly starting the reset circuit (3) of the intercom terminal CPU (2) whose function has been stopped from the controller, between the plurality of interphone terminals connected in 1) and centrally managed by the controller. A carrier detection circuit (4) for detecting the carrier from the controller;
When a predetermined detection time elapses after detecting the carrier detection time by being connected to the carrier detection circuit , a reset signal is output.
A force to reset the watchdog timer (5), wherein a transmission data demodulation circuit for demodulating the data of the common line and transmitted the reset command (7), the interphone terminal CPU, the interphone end
If the CPU is normal, the demodulated data
Real data received and the serial data
A serial receiving circuit (8) for outputting data (Sd);
The reset command from the serial receiving circuit
Real data and a predetermined reset command (R
c) is compared, and when they match, the switch OFF signal (Soff)
And a reset command decode circuit (9) that outputs
The switch (SW) is turned off by the switch OFF signal.
And preventing output of a reset signal to the reset circuit, and when the intercom terminal CPU stops functioning, the carrier detection circuit detects the carrier and the carrier detection time detected by the reset monitoring timer is monitored for a predetermined time. The carrier detection circuit detects the carrier by not outputting data and a carrier as a reset command for notifying that the carrier for reset is transmitted from the controller before the intercom terminal stops functioning when the time has elapsed. that no longer the switch ON signal output from said carrier detecting circuit (Son) is switch times for outputting the reset signal to the reset circuit through the switch is inputted is turned ON
A common line intercom terminal reset device comprising a path (6).