JPH0685591B2 - Synchronous pulse transmission control system for key telephone devices - Google Patents

Description

The present invention relates to a sync pulse transmission control system in a key telephone device.

"Prior Art" FIG. 2 is a block diagram of a conventional key telephone device. 1
Is a central line, 2 is a main unit, and 3-1 and 3-2 and 3-n are key telephones, and a large number of buses 4 are connected to the main unit 2.

The bus 4 is composed of a speech path 4a and a data path 4b.
The control from the main device 2 to each key telephone 3-1 to 3-n and the control such as a station line connection request from each key telephone 3-1 to 3-n to the main device 2 are performed by data transmission through the data path 4b. Has been done. Therefore, the main unit 2 and each key telephone 3-1 to 3-n have a data transmission / reception circuit and its control circuit, and each telephone 3-1 to 3-n has a display, a push button, etc. Output means is provided. The data transmission is sent from the main unit 2 and controlled by the sync pulse. When adding a key telephone, it is possible to connect sequentially to the bus 4 by setting a new address for that telephone, and up to a predetermined number in relation to the processing time in practice or the scale of the control circuit. It is usual to configure so that it can be expanded.

As a control signal transmission method, a data signal including a control signal is transmitted from the main device 2 to each button telephone 3-1 to 3-n by a polling method, and each key telephone 3-1 to 3-n is transmitted.
-N is performed by sending a data signal to the main unit 2 so as to respond to this, and when the side that needs to send the control signal sends the data signal in synchronization with the sync pulse, For example, there are cases where the main device 2 and the key telephone set 3-2 transmit and receive control signals. In the latter case, it is possible that multiple devices need to send control signals at the same time, so each device is given a priority, and in the case of simultaneous sending, a device with a higher priority sends a control signal. Is configured as follows. Therefore, for example, a priority is given corresponding to the order of each address, and the main unit 2 is usually assigned to the highest level.

FIG. 3 (A) is an example of the control signal transmission method by the former, and FIG. 3 (B) is an example of the synchronization pulse and the data signal by the latter control signal transmission method.

In FIG. 3 (A), M is a signal sent from the main unit 2, and T ₁ and T ₂ are signals of the key telephones 3-1 to 3-n, respectively, which are representative of two units. a is a sync pulse,
g _{1 to} g ₄ are data signals, b is the address code of the self (source), c is the address code of the destination, d is the instruction code of the control signal length (telegram length), and e is the control signal (telegram). ) Code, f is a check code.

The content of the destination address code c of the data signal g ₁ is the address code of the key telephone corresponding to the signal waveform T _1. Therefore, when the data g ₁ is received, the key telephone of the corresponding address responds to it. Send g ₂ . The content of the address code b of the destination at this time becomes the address of the main device 2. Next, the main unit 2 designates the address of the key telephone corresponding to the signal waveform T ₂ and designates the data signal.
Send g ₃ . In the same manner, the main unit 2 sequentially transmits / receives a data signal to / from the key telephone, and the operation of the key telephone unit is performed. FIG. 3 (B) is an example of the latter control signal transmission method by the latter described above, and the explanation of the additional symbols is the same as in the case of FIG. 3 (A), but in this case, as described above, the main device 2 Even if the synchronization pulse a is transmitted from the device, the data signal is not transmitted / received unless there is a device that needs to generate the control signal. The data signal g ₅ is, for example, a case where there is an incoming call on the office line 1 and the main device 2 sends a control signal for displaying an incoming call to all of the key telephones 3-1 to 3-n. The address code c is designated by an address code of, for example, "0" which is not assigned to each key telephone set 3-1 to 3-n.

The data signals g ₆ and g ₆ ′ are in the case where the button telephones that need to generate the control signal are duplicated, and other high-priority devices (buttons) are in the process of transmitting their own address code b ′. shows an example in which key telephone phone) corresponds to a signal waveform T ₂ know that sends data signals g ₆ is escape from the sending of the data signal g ₆ '. As a method of detecting the presence / absence of data signal transmission by a device with a high priority, for example, a device with a higher priority may set a shorter time t ₀ from the synchronization pulse to the start of data signal transmission, or at least a self-timer. There is a method of detecting the presence of the superior address code by receiving another data signal in bit units of the address code during transmission of the address code b (b ') of FIG. Therefore, detailed description is omitted.

In the conventional synchronous pulse transmission control system for a key telephone device as described above, when the number of key telephones needs to be increased, a predetermined number can be added by allocating a new address as described above. A control circuit and the like are configured.

By the way, recently, there has been a demand for the expansion of equipment (non-call system) having a monitoring function such as opening and closing of doors, etc. in addition to the device having a call function (call system) such as a button telephone, which is partially put into practical use. Has been converted. For such devices,
A sensor is connected to the input circuit, and it is configured as a so-called security device that sends status information etc. of this sensor as a data signal and generates an alarm sound between non-communication equipment and via communication equipment. . Conventionally, the above-mentioned non-call system expansion is performed in the same manner as the communication system expansion, and the synchronous pulse transmission control system as a button telephone device including them is the same as the above-mentioned third system.
It is similar to the one described in the figure. Therefore, for example, when the main device 2 cannot send the sync pulse for some reason, the non-communication system also stops functioning.

"Problems to be solved by the invention" Generally speaking, the call system has few opportunities when it is absent or when there are a small number of people, but the non-call system has to function when it is small or unattended. I won't. For example, since the function of the main device 2 is unintentionally stopped because the use of the call system for being absent and the like disappears, the opportunities for the functions of the call system and the non-call system to conflict with each other are contradictory. There is a problem that the non-call system does not function because the transmission of the synchronization pulse from the main device 2 remains stopped. With the widespread use of this type of device, there has been a strong demand for its improvement. The present invention has been made in view of this point.

[Means for Solving the Problems] Therefore, the present invention relates to a synchronization pulse transmitted from the main device to the data path by connecting the main device and a plurality of key telephones by a bus composed of a speech path and a data path. In the key telephone device in which data transmission is performed between the key telephone and the main unit, a plurality of other terminal devices that share the bus and perform data transmission are connected, and at least one of the terminal devices is connected. One of them is configured to detect the presence / absence of a sync pulse sent from the main device, and when the sync pulse is not detected, the sync pulse having the same cycle as the sync pulse can be sent.

[Operation] According to the configuration described above, a device for transmitting a sync pulse is provided for each of the call system and the non-call system, and the sync pulse of either one of the devices is effectively output and the sync pulse of the one Even if is not sent, the data transmission can be continued by the sync pulse of the other device,
For example, if the synchronous pulse transmission of the non-communication system device is configured to be prioritized, the communication system and the non-communication system can be made to operate independently, and the above-mentioned demand can be met.

[Embodiment] FIG. 1 is a block diagram of a key telephone device according to the present invention, and the same parts as those in FIG. 2 are designated by the same reference numerals. 5-1 and 5-n are non-call terminal devices and are configured to have the same functions as the key telephones 3-1 to 3-n for data transmission. Each of 6a and 6n is a sensor provided corresponding to an electric device or the like. For example, when the sensor 6n responds, the terminal device 5-n sends a data signal. When the address code c of the callee is sent as the terminal device 5-1 with a control signal for ringing all the speakers of the key telephones 3-1 to 3-n as the control signal at that time, the terminal device 5-1 Upon receiving this information, the main unit 2
Is sent as a data signal to all the speakers of the key telephones 3-1 to 3-n. Whether or not the terminal device 5-1 is provided with the relay function of the above information is a matter of whether or not the control circuit of the terminal device 5-1 is configured in the same manner as the control circuit of the main device 2, and is directly related to the present invention. It doesn't matter. That is, for example, only the speaker of the terminal device 5-1 may be activated as the control signal. However, in the present invention, at least one of the non-calling terminal devices 5-1 to 5-n is provided with the function of transmitting the synchronization pulse. The configuration therefor may be the same as that of the main device 2. In the present embodiment, a case will be described where the terminal device 5-1 is configured to send a synchronization pulse. Non-call type terminal devices 5-1 to 5-
The data transmission method and data signal of n are the same as those of the key telephones 3-1 to 3-n as described in FIG. As described above, when the control signal is transmitted even when the main device 2 is supported, it is preferable to add the relay function to the terminal device 5-1 to reduce the scale of the control circuit of the main device 2. You can

In the normal state, the above-mentioned data transmission is performed with reference to the sync pulse sent from the main device 2, for example, but if the main device 2 cannot send the sync pulse for some reason, the terminal device 5- 1 transmits a sync pulse to continue data transmission, and this configuration will be described in detail because it is an important item in the present invention.

FIG. 4 is a waveform diagram showing a synchronous pulse transmission control state of the main device 2 and the terminal device 5-1. M is a synchronous pulse transmission waveform of the main device 2 and S is a synchronous pulse transmission waveform of the terminal device 5-1. . After the power is turned on, the time t ₁ at which the main unit 2 starts transmitting the synchronization pulse a and the terminal device 5-1 outputs the synchronization pulse a ′.
If a difference is provided with the time t _{2 at} which the transmission of the signal is started (hereinafter, t ₁ and t ₂ are referred to as synchronization pulse waiting time) and t ₁ <t ₂ , the synchronization pulse a is first transmitted to the data path 4b. . Since this synchronization pulse a is received by the terminal device 5-1, the terminal device 5
The -1 control circuit is configured to stop the transmission of the synchronization pulse a'which it should transmit when receiving the synchronization pulse a. As a result, the synchronizing pulse a'is not transmitted to the data path 4b, and the data signal is transmitted and received with reference to the synchronizing pulse a as described in FIG. Sync pulse a
Since sent at a constant period t _3, in the later time t ₂ the timing of the synchronization pulse delivery of terminal equipment 5-1 'and, t _3' t ₃ are constructed such that = t _3. While the main device 2 sequentially outputs the synchronization pulse a at the constant cycle t ₃ , the synchronization pulse a is received by the terminal device 5-1 during the synchronization pulse waiting time t ₂ , so that the synchronization pulse a ′ The transmission is stopped each time. The synchronization pulse waiting time t ₂ after the terminal device 5-1 receives the synchronization pulse a once starts at the third time.
The time set for transmitting or receiving the data signal g- shown in the figure (data transmission processing time, and other processing time may be provided if necessary) is configured to be from the end point G To do. Therefore, the synchronization pulse waiting time t ₂
Must be longer than the times t ₄ and t ₄ ′ in FIG.

Now, when the synchronization pulse a from the main device 2 is not transmitted at the time point T, the synchronization pulse a is not received during the synchronization pulse waiting time t ₂ of the terminal device 5-1. After the end of the sync pulse waiting time t ₂ , the sync pulse a ′ is sent to the data path 4b. After that, a fixed period
At t ₃ ′, the synchronizing pulse a ′ is sent from the terminal equipment 5-1 and the data transmission is thereby continued. Therefore, even if the data processing of the call system is stopped due to the stoppage of the function of the main unit 2, the non-call terminal device 5
Mutual data processing in -1 to 5-n can be continued.

Since the control of this synchronizing pulse is usually performed by a microprocessor, its flow chart is shown in FIG. As can be seen from this figure, the synchronization pulse waiting times t ₁ and t ₂ in the embodiment determine the time difference between the upper and lower sides when the address of the device is input. In the embodiment, the main device 2 is set to the higher address. It should be noted that the addresses may be set in the order opposite to that of the embodiment. Further, it is possible to use three or more devices that can send the synchronization pulse.

[Advantages of the Invention] As described above, according to the present invention, in the key telephone device in which the non-communication system device is connected so that the data is transmitted by the common bus, the opportunity to exhibit the functions of the communication system and the non-communication system device. However, even if the transmission of the sync pulse from the main unit remains stopped as described above because of the reciprocal of the above, a complementary (or priority) sync pulse from the non-communication system device Since the data transmission between the non-communication equipments is continued by the transmission, the problems described at the beginning can be solved and a wide range of demand can be met. Further, the present invention is
Since the priority order of the devices that can send the sync pulse is determined by the difference in the sync pulse waiting time described above, the circuit for that is not complicated.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a key telephone device according to the present invention, and FIG. 2 is a block diagram of a conventional key telephone device.
FIG. 3 is a waveform diagram showing an example of a sync pulse and a data signal according to a sync pulse transmission control system in a conventional key telephone device. FIG. 4 is a waveform diagram showing an embodiment of the synchronous pulse transmission control system according to the present invention. FIG. 5 is a flow chart showing an embodiment of the synchronous pulse transmission control system according to the present invention. 1 ... Station line, 2 ... Main device, 3-1 to 3-n ... Button telephone, 4 ... Bus, 5-1 to 5-n ... Non-call terminal device,
M ... signal waveform of the main apparatus, T _1, T ₂ ... key telephone signal waveform, S ... non-speech-based terminal device synchronizing pulse waveform, a, a '...
Sync pulse, t ₁ , t ₂ ... Sync pulse waiting time, g _{1 to} g ₆ and g
--- Data signal.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiko Sakamoto 6-10-13 Nakanobu, Shinagawa-ku, Tokyo Incorporated Daiko Denki Seisakusho, Inc. 56) References JP-A-56-161750 (JP, A) JP-A-53-130905 (JP, A)

Claims (1)

[Claims] 1. A main device and a plurality of key telephones are connected by a bus consisting of a speech path and a data path, and the key telephone and the main device are synchronized with a synchronization pulse sent from the main device to the data path. In a key telephone device configured to perform data transmission between terminals, a plurality of other terminal devices that share the bus and perform data transmission are connected, and at least one of the terminal devices is connected to the main device. Sync pulse receiving means for receiving the sync pulse sent from the device, means for detecting whether or not the sync pulse is received within a fixed time, and a sync pulse sent from the main device when the sync pulse is not detected A synchronization pulse transmission control system for a key telephone device, characterized in that it is provided with a synchronization pulse transmission means for transmitting a synchronization pulse of the same cycle as the above.