JP3004047B2 - Key telephone equipment - Google Patents

Description

Description: Object of the Invention (Industrial Application Field) The present invention generally relates to a key telephone device, and in particular, an add-on module for enhancing the function of the key telephone, and a structure to which the add-on module can be connected. And a key telephone device provided with the key telephone device.

(Prior Art) FIG. 7 is a block diagram showing an overall configuration of a conventional key telephone apparatus. The key telephone apparatus shown in FIG. 7 includes a main apparatus 1 and a plurality of add-on modules 14 and 18 provided for enhancing the functions of the key telephone.
18 is provided with a plurality of key telephones 10 and 20 each of which is connectable. In FIG. 7, for convenience of illustration,
Only two add-on modules and two key telephones are described.

In FIG. 7, a main unit 1 includes a central office line interface unit 2 connected to central office lines 17a and 17b, a key telephone interface unit 4 provided corresponding to the key telephone 10, and a main unit corresponding to the key telephone 20. Key telephone interface unit 5, time switch 3, and key telephone interface units 4, 5
And a central control circuit 6 for placing the control signal under control. The central control circuit 6 includes a CPU 7, a ROM 8, and a RAM 9. Details of the above configuration will be described later.

On the other hand, the key telephone 10 starts the data transmission means 11,
Not only transmission / reception circuit system 12 and CP13, but also dial pad, extension key switch, LE for extension key switch
D, office line key switch, office line key switch LED, etc. (all not shown).

The add-on module 14 has a configuration including a selector circuit 15, a CPU 16, and normally open contacts 35a to 35n. The selector circuit 15 has AND circuits 15a and 15c, an inverter circuit 15b, and an OR circuit 15d. Normally open contacts 35a to 35n
Is closed by a pressing operation of one-touch keys (not shown) provided on the keyboard of the add-on module 14 in correspondence with the normally open contacts 35a to 35n, respectively. Each of these one-touch keys (not shown)
Is assigned, for example, as a one-touch key for accessing the speed dial data stored in advance in the RAM 9 or the like of the central control circuit 6.

The configuration of the key telephone 10 and the configuration of the add-on module 14 will be further described.

In the following description, the key telephone 10 is in a state in which the central office 1 can communicate with the central office 1
It is assumed that 17b is captured.

The data transmission means 11 includes, for example, a ping-pong transmission data transformer and a ping-pong transmission circuit. The ping-pong transmission circuit, under the control of the CPU 13 of the key telephone 10,
It receives serial digital data of a PCM signal (voice signal data) and control data transmitted from the key telephone interface unit 4 by a ping-pong transmission method through a ping-pong transmission data transformer. Then, the PCM signal of the serial digital data is output to the transmission / reception circuit system 12, while the control data is output to the CPU 13 and the add-on module 14. The ping-pong transmission circuit also receives a PCM signal (voice signal data) output from the transmission / reception circuit system 12 and control data output from the CPU 13 or the add-on module 14. The PCM signal and the control data are converted into serial digital data, and the serial digital data is output to the button telephone interface unit 4 through a ping-pong transmission data transformer.

The transmitting / receiving circuit 12 includes a codec, a transmitting amplifier, a receiving amplifier, a handset transmitter, and a handset receiver. Illustration of these units constituting the transmission / reception circuit system 12 is omitted.

The CPU 13 receives the control data output from the data transmission means 11. Then, by analyzing the received control data, it is detected whether or not the uplink data output request signal is included in the control data. When the CPU 13 determines that it is necessary to transmit various control data from the key telephone 10 to the main device 1, the control data provided from the data transmission unit 11 includes an upstream data output request signal. When the CPU 16 recognizes that there is an input signal, it sends an upstream data transmission inhibition signal of logic level “H” to one input terminal of the AND circuit 15a and the input terminal of the inverter circuit 15b, which constitute the selector circuit 15, and the CPU 16. Along with this, CP
U13 sends out various control data in the form of serial data to the other input terminal of the AND circuit 15a. Thus, the various control data sent from the CPU 13 to the other input terminal of the AND circuit 15a is supplied from the OR circuit 15d to the data transmission means 11 as it is. When the CPU 13 determines that it is not necessary to transmit the above-described various control data to the main device 1, the CPU 13 determines that the control data provided from the data transmission unit 11 includes the upstream data output request signal. When recognizing it, it transmits an uplink data transmission permission signal of logic level “L” to one input terminal of the AND circuit 15a, the input terminal of the inverter circuit 15b, and the CPU 16. At this time, the CPU 16 of the add-on module 14
When the controller recognizes the need to transmit control data corresponding to the closing operation to the main device 1 and outputs predetermined serial data, the selector circuit
From 15, the serial data is provided to the data transmission means 11 in the form as it is.

Here, operations of the selector circuit 15, the CPU 13, and the CPU 16 will be described. When the CPU 13 outputs the upstream data transmission inhibition signal of the logic level “H”, the signal is applied to the one input terminal of the AND circuit 15a and the CPU 16 at the logic level “H”. On the other hand, when the signal passes through the inverter circuit 15b, the logical level of the signal is inverted from “H” to “L” and applied to one input terminal of the AND circuit 15c. The CPU 16 determines that the output of the control data to be transmitted from the add-on module 14 to the main device 1 is prohibited by the output of the signal from the CPU 13. Then, the output of the control data to one input terminal of the AND circuit 15c is stopped. The reason why the CPU 16 checks whether or not the upstream data transmission inhibition signal is output from the CPU 13 is that the control data from the CPU 16 is transmitted to the main device 1 because the CPU 13 transmits the control data to the main device 1 side. This is to prevent the control data from being output from the CPU 16 when the data cannot be sent to the side. At the same time as the output of the upstream data transmission inhibition signal of the logic level “H”, the CP
When the control data is output from U13 to the other input terminal of the AND circuit 15a, the logical level of the output signal from the AND circuit 15c is "L". , The control data is output.

Conversely, when the CPU 13 outputs the upstream data transmission permission signal of the logical level “L”, the signal is applied to the one input terminal of the AND circuit 15a and the CPU 16 by the logical level “L”.
It is applied as it is. On the other hand, when the signal passes through the inverter circuit 15b, the logical level thereof is inverted from “L” to “H” and applied to one input terminal of the AND circuit 15c. The CPU 16 determines that the output of the control data to be transmitted to the main device 1 from the add-on module 14 is permitted by the output of the signal from the CPU 13. Then, output of the control data to one input terminal of the AND circuit 15c is started. At this time, CPU13
Irrespective of whether or not control data is output to one input terminal of the AND circuit 15a from the OR circuit 15a, since the logical level of the output signal from the AND circuit 15a is "L", Thus, the control data on the CPU 16 side is output to the data transmission means 11.

Here, the upstream data output request signal is a signal given from the main device 1 (that is, the central control circuit 6) to the key telephone 10 and the add-on module 14 at predetermined intervals.
This signal is a request signal to output some control data to the key telephone 10 and the add-on module 14. For example, when the upstream data request signal is given from the main device 1 side, various control data from the CPU 13 side of the key telephone 10 or control data sent from the CPU 16 side of the add-on module 14 to the main device 1 side is Each is selectively transmitted.

The key telephone 20 has the same configuration as the key telephone 10. That is, in addition to the data transmission means 21, the transmission / reception circuit system 22, the CPU 23, etc., the dial pad, the extension key switch, the extension key switch LED, the office key switch, the office key switch LED, etc. (Both are not shown). Add-on module 18
Has the same configuration as the add-on module 14.
That is, the AND circuits 40a and 40c, the inverter circuit 40b, and the OR circuit 4
Starting with the selector circuit 40 having 0d, the CPU 16, the normally open contact 45a
~ 45n and so on. Therefore, a detailed description of the configuration of the key telephone 20 and the configuration of the add-on module 18 will be omitted.

When the add-on module 14 is not connected to the key telephone 10, the key telephone 10
The data transmission means 11 and the CPU 13 are provided so that various control data output from U13 are directly given to the data transmission means 11.
Is connected. Also, when the add-on module 18 is not connected to the key telephone 20, the key telephone 20 is connected to the data transmission unit 21 so that various control data output from the CPU 46 is directly supplied to the data transmission unit 21. The connection to the CPU 23 is established.

(Problem to be Solved by the Invention) In the conventional add-on module 14 (or add-on module 18) configured as described above, the CPU 13 of the key telephone 10 with respect to the main device 1 (or the CPU 23 of the key telephone 20). Transmission of control data and CPU 16 (or add-on module 1
The transmission of control data from the CPU 46 on the 8 side is performed by the selector circuit 15 (or the selector circuit 40) including two AND circuits, one inverter circuit, and one OR circuit as shown in the figure.
Therefore, the number of components constituting the add-on module 14 (or the add-on module 18) is unavoidably increased, which causes a problem that the cost is increased.

Therefore, the present invention has been made to solve the above-mentioned problem, and an object of the present invention is to selectively transmit control data from the key telephone to the main unit and control data from the add-on module. An object of the present invention is to provide a key telephone device provided with an add-on module that can be adjusted with a small number of components.

[Configuration of the invention]

(Means for Solving the Problems) To achieve the above object, a key telephone apparatus according to the present invention includes a control unit that generates and outputs control data corresponding to an input signal by a key operation or an input signal by a button operation. A plurality of add-on modules for enhancing the function of the key telephone, a plurality of key telephones configured to be separately connectable to each other, and each of the key telephones are connected to the respective key telephone to enhance the function of the key telephone. A plurality of add-on modules having a plurality of keys for operating the plurality of keys, generating and transmitting control data corresponding to a key input signal given by operation of the plurality of keys; To exchange control data between the plurality of key telephones by transmitting and receiving control data to and from the control unit or the add-on module. A main unit that sets up an extension call and a line call that exchanges and connects each of the key telephones and the line.The add-on module receives downlink control data output from the main device, Data analysis means for analyzing whether or not the downlink control data includes an uplink data output request signal indicating a control data output request to the terminal; and receiving control data given by operating the key. When an analysis result indicating that the uplink data output request signal has been given is output from the data analysis means and a control data output permission signal is given from the control unit of the corresponding key telephone, the received control is received. Control data output means for outputting data; and said control means when the control unit sends a control data output inhibit signal to the control data output means. Control data output from the control unit, and when the control unit sends a control data output permission signal to the control data output unit, the control data output from the control data output unit is transmitted to the main unit. And a control data output selecting means for selectively outputting the data.

(Operation) In the above configuration, the plurality of key telephones are configured such that an add-on module as an extension terminal for adding various buttons, for example, can be separately connected as a means for enhancing the function of each of the key telephones. . The control units of the plurality of key telephones generate control signals corresponding to input signals by key operation and input signals by button operation, and output the control data to the main device. A plurality of add-on modules are connected to each of the key telephones. And it has a plurality of keys for enhancing the function of each key telephone. Each add-on module sends control data corresponding to a key input signal given by operating these keys to the main device. The main unit is connected to the central office and exchanges control data with the control unit or add-on module of each key telephone. Thus, the main device sets an extension call for exchanging and connecting the plurality of key telephones and an office call for exchanging and connecting the plurality of key telephones and the office line.

In the add-on module according to the present invention, a data analysis unit, a control data output unit, and a control data output selection unit are provided.

When the downlink control data is output from the main device, the data analysis unit receives the downlink control data and determines whether or not the downlink control data includes an uplink data output request signal indicating a control data output request to the terminal. Is analyzed, and this analysis result is given to the control data output means. The control data output means is provided by a key operation when an analysis result indicating that the upstream data output request signal is provided from the data analysis means is output and the control data output permission signal is provided from the control unit of the corresponding key telephone. The obtained control data is output to the control data output selecting means. When a control data output permission signal is given from the control unit to the control data output means, the control data given from the control data output means is output from the control data output selection means to the main device. You. On the other hand, when the control unit outputs a control data output inhibition signal to the control data output unit, the control data output selection unit outputs the control data output from the control unit to the main device. You.

In this way, the control unit and the control data output selection unit of the corresponding key telephone set can give priority to the transmission of the control data from the control unit to the transmission of the control data output from the control data output unit. That is, the selective adjustment of the transmission of the control data from the key telephone to the main device and the transmission of the control data from the add-on module can be realized with a small number of components.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an overall configuration of a key telephone apparatus to which an embodiment of the present invention is applied. The key telephone apparatus shown in FIG. 1 includes an add-on module provided to enhance the functions of the key telephone including the main apparatus 1 (that is, an extension terminal for the key addition disposed next to the key telephone). The same applies hereinafter) 24, and the key telephone 10 to which the add-on module 24 can be connected.

The internal configurations of the add-on module 24 and the key telephone 10 will be described later in detail. In FIG. 1, only one add-on module and one key telephone are shown for convenience of illustration, but a plurality of key telephones are connected to the main device 1 according to the present embodiment. An add-on module is connected to each of the plurality of key telephones.

In FIG. 1, the main unit 1 includes a central office interface unit 2 connected to central office lines 17a and 17b, a key telephone interface unit 4 provided corresponding to the key telephone 10, and a key telephone 10. And a key telephone interface unit 5 provided corresponding to any one key telephone (not shown) among the remaining key telephones. The main device 1 has, in addition to the above components, a time switch 3 and a central control circuit 6 for controlling the central office interface unit 2, the time switch 3, and the key telephone interface units 4, 5. ing. The above configuration is described in more detail below.

The office line interface unit 2 is provided for connecting the office lines 17a and 17b and the key telephone device, and includes an office line interface circuit, a transformer,
It has a line conversion circuit, a receiving amplifier, a transmitting amplifier, a codec and a control circuit. Office line interface unit 2
Although the illustration of each of these components is omitted, the configuration of each of these components is as follows.

That is, the office line interface unit circuit detects an incoming call signal from an office line, captures an office line, sends a dial pulse signal, and the like under the control of the control circuit. Transformer consists of office line interface circuit and 2-wire 4
It is connected between the line conversion circuit. The two-wire / four-wire conversion circuit receives an analog signal (received voice signal or the like) given from the office lines 17a and 17b through the office line interface circuit and the transformer, and outputs this to the receiver amplifier. The two-wire / four-wire conversion circuit also receives an analog signal (speech sound signal or the like) output from the transmission amplifier and sends it to the office lines 17a and 17b through a transformer and an office line interface circuit. Has become.

The receiving amplifier receives and amplifies the analog signal (received voice signal or the like) given from the two-wire / four-wire conversion circuit,
Output to codec. On the other hand, the transmission amplifier receives and amplifies an analog signal (transmission voice signal or the like) output from the codec, and then outputs the amplified signal to the two-wire / four-wire conversion circuit.

The codec receives the analog signal (received voice signal, etc.) amplified by the receiving amplifier, digitizes it, and converts it into a PC.
Convert to M signal. Then, this PCM signal is output to the time switch 3 through a time slot allocated on the incoming PCM highway. The codec also receives the PCM signal output from the time switch 3 through a time slot allocated on the outgoing PCM highway. Then, after converting the PCM signal into an analog signal (a transmission voice signal or the like), the PCM signal is output to a transmission amplifier.

The control circuit is placed under the control of the central control circuit 6 together with the time switch 3 described above. That is, the control circuit exchanges control signals with the central control circuit 6 through the data highway. When a control signal is received from the central control circuit 6 via the data highway indicating that the station lines 17a, 17b should be captured, the control circuit controls the station line interface circuit in accordance with the control signal to capture the station lines 17a, 17b. .
The control circuit also includes the office line interface circuits
When it is detected that a call signal has arrived from b, a data signal indicating that the call signal has arrived is output to the central control circuit 6 through the data highway.

The time switch 3 includes a call memory, a counter circuit, and the like. Then, under the control of the central control circuit 6, signals output through a plurality of incoming PCM highways are multiplexed, demultiplexed, or phase-converted, thereby time-sharing the corresponding incoming PCM highway and outgoing PCM highway. It is designed to be exchanged.

That is, the time switch 3 receives the PCM signal given from the time slot allocated on the incoming PCM highway, and constitutes the key telephone interface unit 4 through the time slot allocated on the outgoing PCM highway. Output to the ping-pong transmission circuit. The time switch 3 also receives a PCM signal output from the ping-pong transmission circuit of the key telephone interface unit 4 through a time slot allocated on the incoming PCM highway and passes it through a time slot allocated on the outgoing PCM highway. Output to the codec.

The time switch 3 further transmits the PCM signal output from the codec through the time slot allocated on the incoming PCM highway and the time slot allocated on the outgoing PCM highway to the ping-pong transmission constituting the key telephone interface unit 5. The PCM signal output from the ping-pong transmission circuit constituting the key telephone interface unit 5 is supplied to the codec through the time slot allocated on the incoming PCM highway and the time slot allocated on the outgoing PCM highway. give.

The key telephone interface unit 4 has a configuration including a ping-pong transmission circuit, a control circuit, and a ping-pong transmission data transformer (all not shown).

Under the control of the control circuit, the ping-pong transmission circuit
The PCM signal (voice signal data) transmitted from the time switch 3 through the time slot allocated on the M highway and the control digital data supplied from the control circuit are transmitted to the key telephone 10 in a ping-pong transmission system. (Digital transmission method).
The ping-pong transmission circuit also receives serial digital data of a PCM signal (voice signal data) and control data sent from the key telephone 10 by the ping-pong transmission method, and transmits the PCM signal on the incoming PCM highway. Output to the time switch 3 through the assigned time slot, while outputting control data to the control circuit of the key telephone interface unit 4. The control circuit receives the control data sent from the central control circuit 6 through the data highway and outputs it to the ping-pong transmission circuit of the key telephone interface unit 4. The control circuit also receives the control data of the key telephone 10 given from the ping-pong transmission circuit, and outputs it to the central control circuit 6 through the data highway.

The key telephone interface unit 5 has the same configuration as the key telephone interface unit 4.

That is, under the control of the control circuit, the ping-pong transmission circuit of the key telephone interface unit 5 provides the PCM signal (voice signal data) transmitted from the time switch 3 through the time slot allocated on the outgoing PCM highway and the control circuit. The digital data serialized with the control data is transmitted to any one of the key telephones (not shown) except the key telephone 10 by a ping-pong transmission method. The ping-pong transmission circuit receives serial digital data of a PCM signal (voice signal data) and control data transmitted from the key telephone (not shown) to the ping-pong by a transmission method. Output to the time switch 3 through a time slot allocated on the incoming PCM highway, while outputting control data to the control circuit of the key telephone interface unit 5. The control circuit receives the control data sent from the central control circuit 6 through the data highway and outputs it to the ping-pong transmission circuit of the key telephone interface unit 5, as described above. The control circuit also receives control data on the key telephone set 20 provided from the ping-pong transmission circuit and outputs the control data to the central control circuit 6 through the data highway.

The central control circuit 6 includes a CPU 7, a ROM 8, and a RAM 9.

The ROM 8 contains a control program and the like.
Non-volatile fixed data is stored. The RAM 9 stores various data including, for example, speed dial data. The speed dial data stored in the RAM 9 will be described later in detail.

The CPU 7 includes the time switch 3 described above, the various parts constituting the central line interface unit 2, and the key telephone interface units 4, 5 (as described above, the first unit).
In the figure, only one key telephone and one add-on module are shown for convenience of illustration. On the other hand, only two of the button telephone interface units provided corresponding to the respective key telephones and the add-on modules are shown). Is under its control.

The CPU 7 according to the present embodiment has various functions represented by functional blocks denoted by reference numerals 7a to 7e. That is, CP
Inside the U7, an uplink data input unit 7a, an uplink data analysis unit 7b, an ADM key processing unit 7c, a DKT input processing unit 7d, and a downlink data / uplink request data transmission unit 7e are constructed by software.

The upstream data input means 7a reads the control information transmitted from the key telephone interface unit 4 side through the data highway as upstream data given from the key telephone 10 or the add-on module 24 side. The upstream data input unit 7a sends the read upstream data to the upstream data analysis unit 7b. The control information is given from the control circuit to the upstream data input means 7a through the data highway by the CPU 7 outputting a predetermined control signal to the control circuit of the key telephone interface unit 4 through the data highway. The upstream data input means 7a executes the same processing as described above with respect to the control information transmitted from the key telephone interface unit 5 via the data highway.

The upstream data analysis unit 7b is provided with the upstream data input unit 7a.
By reading the upstream data sent from the PC and analyzing the upstream data, the upstream data is transmitted to the key telephone 10 side.
It is determined which of the CPU 13 and the CPU 26 of the add-on module 24 has sent the data. As a result of analyzing the upstream data, if it is determined that the upstream data is transmitted from the CPU 13 of the key telephone 10, the upstream data analyzing unit 7b transmits the upstream data to the DKT input processing unit 7b. On the other hand, as a result of analyzing the above uplink data, the CP of the add-on module 24 side
When determining that the data is transmitted from U26, the upstream data analysis unit 7b converts the upstream data into the ADM key processing unit 7c.
To send to.

Upon receiving the uplink data from the uplink data analysis unit 7b, the DKT input processing unit 7d executes a signal processing operation based on the uplink data. As a signal processing operation performed by the DKT input processing means 7d based on the uplink data, for example,
An LED lighting control signal for turning on an extension key switch LED (not shown) of the key telephone 10 during an extension call of the key telephone 10, and a CPU for a key telephone (not shown) side different from the key telephone 10. A data signal indicating that a call has been made, and a signal for notifying the CPU 13 of a response to the call of the key telephone 10 from a key telephone (not shown) different from the key telephone 10 are generated. is there. In addition, during a central office telephone call of the key telephone 10, an LED lighting control signal for lighting a central line key switch LED (not shown) of the key telephone 10, a data signal indicating that there is a call from the central office, and the like. Generation etc. can also be raised. DKT
The input processing unit 7d provides a signal or the like obtained as a result of executing a signal processing operation based on the uplink data provided from the uplink data analysis unit 7b to the downlink data / uplink request data transmission unit 7e as control data. Has become. The DKT input processing means 7d can be used even when a key telephone (not shown) other than the key telephone 10 calls an extension or a central office.
The same signal processing as described above is performed.

When the ADM key processing means 7C receives the uplink data from the uplink data analysis means 7b, it performs a signal processing operation based on the uplink data. As a signal processing operation performed by the ADM key processing means 7c based on the uplink data, for example,
For example, generation of a speed dial data read signal for reading speed data corresponding to the uplink data from speed dial data stored in a predetermined storage area of the RAM 9 in advance. The ADM key processing unit 7c supplies a signal or the like obtained as a result of executing a signal processing operation based on the uplink data provided from the uplink data analysis unit 7b to the transmission unit 7e as downlink data / uplink request data as control data. It has become.

When the control data is supplied from the DKT input processing means 7d, the downlink data / uplink request data transmitting means 7e uses the control data as downlink data through the data highway and the key telephone interface unit 4 to transmit the key telephone 10e.
To the CPU 13 on the side and the CPU 26 on the side of the add-on module 24. The downlink data / uplink request data transmitting means 7e also
When the control data is given from the M key processing means 7c, the control data, that is, the speed dial data read signal is sent to the RAM 9
And reads out the abbreviated dial data corresponding to the readout signal from a predetermined storage area of the RAM 9. In addition,
The abbreviated dial data read from the RAM 9 by the downstream data / up request data transmitting means 7e is provided by the CPU 7 from the central control circuit 6 to the central office interface unit 2 through the data highway. That is, the abbreviated dial data given to the control circuit of the office line interface unit 2 through the data highway is given from the control circuit to the office line interface circuit, and sent out from the office line interface circuit to the office lines 17a and 17b. . The downlink data / uplink request data sending means 7e sends up request data, that is, an up data output request signal, in addition to the above operation. That is, the downlink data / uplink request data transmitting means 7e is connected to the CPU 13 of the key telephone 10
And, it transmits an upstream data output request signal to the CPU 26 of the add-on module 24 at predetermined intervals. This uplink data output request signal will be described later in detail.

In addition to performing the various functions described above, the CPU 7 communicates with the control circuit through the data highway, a control signal for capturing a local line, a control signal for transmitting a dial pulse signal, and a local line.
A plurality of button telephones (not shown) such as the key telephone 10 can perform a local line call and an internal line call, such as transmitting and receiving a signal notifying the detection of an incoming call signal from the 17a and 17b. It controls each part of the key telephone device.

As is apparent with reference to FIG.
Means a data transmission means 11, a transmission / reception circuit 12, a CPU 1
3 and so on. The data transmission means 11 includes, for example, a ping-pong transmission data transformer and a ping-pong transmission circuit. The ping-pong transmission circuit is located on the key telephone 10 side.
Under the control of the CPU 13, it receives a PCM signal (voice signal data) transmitted from the key telephone interface unit 4 by a ping-pong transmission method and serial digital data of control data through a ping-pong transmission data transformer. And PC of the serial digital data
The M signal is output to the transmission / reception circuit system 12, while
For control data, CPU 13 and add-on module 24
Is output to the CPU 26 on the side. The ping-pong transmission circuit also
The PCM signal (voice signal data) output from the receiving circuit system 12 and the control data output from the CPU 13 or the CPU 26 of the add-on module 24 are received. Then, the PCM signal and the control data are converted into serial digital data,
This serial digital data is output to the key telephone interface unit 4 through the ping-pong transmission data transformer.

The transmitting / receiving circuit 12 includes a codec, a receiving amplifier, a receiving amplifier, a handset transmitter, and a handset receiver. Although illustration of these components constituting the transmission / reception circuit system 12 is omitted, the configuration of each component is as follows.

The codec receives the PCM signal (voice signal data) output from the ping-pong transmission circuit constituting the data transmission means 11, converts the PCM signal into an analog signal (such as a reception voice signal), and outputs the analog signal to the reception amplifier. . The codec also receives an analog signal (speech sound signal or the like) output from the transmission amplifier, converts it into a PCM signal (speech signal data), and outputs the PCM signal to a ping-pong transmission circuit. The receiving amplifier receives an analog signal (a receiving voice signal or the like) output from the codec, amplifies the signal, and outputs the amplified signal to a handset receiver. The transmission amplifier receives an analog signal (transmission voice signal or the like) output from a transmitter of the handset, amplifies the signal, and outputs the amplified signal to the codec.

The CPU 13 according to the present embodiment has various functions represented by functional blocks denoted by reference numerals 13a to 13g. That is, in the CPU 13, the downlink data receiving unit 13a, the downlink data / uplink request analysis unit 13b, the downlink data processing unit 13c, the key input unit 13d, the uplink code creation unit 13e, and the uplink prohibition / permission signal generation unit to the ADM 13f (hereinafter referred to as "uplink prohibition / permission signal generation means") and an uplink code transmission means 13g are constructed by software.

The downlink data receiving means 13a transmits the control information output from the button telephone interface unit 4 through the data transmission means 11 to the button telephone 10 or the add-on module.
Read as downlink data given to 24. The downlink data receiving unit 13a sends the read downlink data to the downlink data / uplink request analysis unit 13b. The above-mentioned control information is transmitted from the control circuit to the data transmission means 11 through the ping-pong transmission circuit and the ping-pong transmission data transformer by the CPU 7 outputting a predetermined control signal to the control circuit of the key telephone interface unit 4 through the data highway. Is done. That is, the data is supplied from the ping-pong transmission data transformer of the data transmission unit 11 to the downstream data reception unit 13a through the ping-pong transmission circuit of the data transmission unit 11.

The downlink data / uplink request analysis unit 13b reads the downlink data sent from the downlink data reception unit 13a and analyzes the downlink data, so that the downlink data is a general downlink code (that is,
It is determined whether the signal is an LED lighting control signal, a signal notifying that there is a response to the call, or the like, or a code requesting uplink data (that is, the above-described uplink data output request signal). As a result of analyzing the uplink data, if it is determined that the code is a general downlink code, the downlink data / uplink request analysis unit 13b sends the downlink data to the downlink data processing unit 13c. On the other hand, as a result of analyzing the downlink data, if it is determined that the code is a code requesting uplink data, the downlink data / uplink request analysis unit 13b sends an uplink data transmission command signal generated based on the downlink data to an uplink code transmission command signal. It is sent to the means 13g.

The downlink data processing unit 13C reads the downlink data transmitted from the downlink data / uplink request analysis unit 13b. Then, a signal processing operation based on the read downlink data is performed. As described above, the signal processing operation performed by the downlink data processing means 13c based on the downlink data includes, for example, an extension key switch LED (not shown) of the key telephone 10 during an extension call of the key telephone 10. There is an output of an LED lighting control signal for lighting to an extension key switch LED driving circuit (not shown). Also, the key telephone 10
LE for key line switch of key telephone 10
An output of an LED lighting control signal for lighting D (not shown) to an LED driving circuit (not shown) for a local line key switch is also included.

The normally open contacts 55a to 55x are provided in correspondence with a plurality of keys and buttons (none of which are shown) provided on the keyboard of the main body of the key telephone set 10. When one of the buttons is pressed, the corresponding normally open contact is closed. Each of the normally open contacts 55a to 55x outputs a predetermined electric signal to the key input means 13d when closed. The key input unit 13d receives a predetermined electric signal from the normally open contact that has been closed by closing one of the normally open contacts 55a to 55x, and receives the electric signal to send the upward code to the upward code creating unit 13e. It is configured to output.

The upstream code generating means 13e reads a predetermined electric signal output from the closed normally open contact through the key input means 13d. Then, based on the read electric signal, a code corresponding to the read electric signal (that is, an up code). Here, the up code means the CPU 13 of the key telephone 10 to the CPU 7 of the main device 1. Refers to various control data given to, for example, this control data, for example,
At the time of extension call, a dial signal for calling another key telephone (not shown) is created. The uplink code generator 13e sends the generated uplink code to the uplink code transmitter 13g.

The uplink code transmission means 13g periodically checks whether or not the above-mentioned uplink data transmission command signal has been transmitted from the downlink data / uplink request analysis means 13b. As a result of this periodic check, the uplink code transmitting unit 13g recognizes that the uplink code has been transmitted from the uplink code creating unit 13e, and determines that it is necessary to transmit various control data corresponding to the uplink code. Then, go up /
A command is issued to the permission signal generating means 13f to output an ADM upstream prohibition signal. Then, the upstream code generating means 13
e) reads the upstream code given from e, and uses the read upstream code as a DKT upstream code as an add-on module 24.
Is output to the AND circuit 25 provided in the. The DKT uplink code is an uplink code transmitting means 13g in the form of serial data.
To the AND circuit 25. At this time, as will be described later, dummy data (“FFH”) having a logic level “H” is output from the uplink data transmitting unit 26a on the add-on module 24 side as ADM uplink data.
From 5, the various control data sent from the upstream code transmission means 13g to the AND circuit 25 is provided to the data transmission means 11 in the form as it is.

On the other hand, as a result of the above check,
When it is determined that there is no need to transmit various control data corresponding to the uplink code by recognizing that the uplink code has not been transmitted from the
Issues a command to the upstream prohibition / permission signal generating means 13f to output an ADM upstream permission signal. Then, an FFH signal (that is, dummy data: a signal of a logic level “H”) is output to the AND circuit 25 as a DKT up code. As a result, the serial data transmitted from the CPU 26 of the add-on module 24 is supplied from the AND circuit 25 to the data transmission means 11 as it is.

The upstream prohibition / permission signal generating means 13f generates a predetermined ADM upstream prohibition signal when the command for outputting the ADM upstream prohibition signal is issued from the upstream code transmitting means 13g, and outputs the ADM upstream prohibition signal from the upstream code transmitting means 13g. When a command to output a permission signal is given, a predetermined ADM upstream permission signal is output to the CPU 26 on the add-on module 24 side.

Here, the upstream data output request signal is a signal given from the main device 1 (that is, the central control circuit 6) to the key telephone 10 and the add-on module 24 at predetermined intervals, as described above. The signal is a request signal to output some control data to the key telephone 10 and the add-on module 24. In this embodiment, when this upstream data output request signal is given from the main device 1 side, various control data from the CPU 13 side of the key telephone 10 or the control data from the CPU 26 side of the add-on module 24 is sent to the main device 1 side. The control data is selectively transmitted, respectively. The control data from the add-on module 24 is for accessing the abbreviated dial data stored in the RAM 9 or the like of the central control circuit 6 in advance, as described later.

As is clear from the above description, in the present embodiment, when an upstream data output request signal is given from the main device 1 through the data transmission means 11, both the CPU 13 and the CPU 26 need to output control data. If it is recognized that there is a possibility, the control data output from the CPU 13 is prioritized. Further, after various control data output in the form of serial data from the CPU 13 and dummy data output from the CPU 26 are input to the AND circuit 25, a predetermined logic level signal is output from the AND circuit 25 as a result of a logical product operation. (I.e., the process in which the above-described various control data) is output to the data transmission means 11 or the control data (key input data) output in the form of serial data from the CPU 26 and the CPU 1
After the dummy data output from 3 is input to the AND circuit 25, a predetermined logic level signal (ie, the key input data) is output from the AND circuit 25 to the data transmission unit 11 as a result of the AND operation. Details of the process will be described on the add-on module 24 side. In addition, key telephones
10 is an add-on module 24 for the key telephone 10
Is not connected, the data transmission unit 11 and the CPU 13 are connected so that various control data output from the CPU 13 is directly supplied to the data transmission unit 11.

The key telephone 10 is connected to the data transmission means 11 described above.
In addition to the receiving circuit system 12 and the CPU 13, the apparatus further includes a dial pad, an extension key switch, an extension key switch LED, an office key switch, an office key switch LED, etc. (all not shown). The extension key switch is pressed when the speaker of the key telephone 10 wants to make an extension call. When the extension key switch is pressed, a signal indicating that the extension key switch is pressed. Is output to the CPU 13. The line key switch is pressed when the speaker of the key telephone 10 wants to make a line passage (external line passage). When the line key switch is pressed, the line key switch is activated. A signal indicating that the pressing operation has been performed is output to the CPU 13. Dial pad button phone
A dial signal corresponding to the button pressed by ten speakers is transmitted to the CPU 13.

As shown in FIG. 1, the add-on module 24 according to one embodiment of the present invention has a configuration including an AND circuit 25, a CPU 26, normally open contacts 30a to 30t, and the like. The add-on module 24 according to one embodiment of the present invention also includes a keyboard 30 having a configuration as shown in FIG.

The CPU 26 according to the present embodiment has various functions represented by functional blocks indicated by reference numerals 26a to 26g. That is, in the CPU 26, the upstream data transmitting unit 26a, the upstream data transmission / prohibition signal receiving unit 26b, the upstream code generating unit 2
6c, key input means 26d, downlink data receiving means 26e, downlink data / uplink request analysis means 26f, and downlink data processing means 26g
Is constructed by software.

The downlink data receiving unit 26e reads the control information output from the key telephone interface unit 4 through the data transmission unit 11 as downlink data given to the key telephone 10 and the add-on module 24. The downlink data receiving means 26e converts the read downlink data into
The data is sent to the downlink data / uplink request analysis means 26f. The above-mentioned control information is transmitted from the control circuit to the data transmission means 11 through the ping-pong transmission circuit and the ping-pong transmission data transformer by the CPU 7 outputting a predetermined control signal to the control circuit of the key telephone interface unit 4 through the data highway. Is done. That is, the data is supplied from the ping-pong transmission data transformer of the data transmission unit 11 to the downstream data reception unit 26e through the ping-pong transmission circuit of the data transmission unit 11.

The downlink data / uplink request analysis unit 26f reads the downlink data transmitted from the downlink data reception unit 26e and analyzes the downlink data, whereby the downlink data is converted into a general downlink code (that is, transmitted to the key telephone 10 described above). There was a response to the LED lighting control signal for the provided LED, an LED lighting control signal for lighting the LED built in each key (shown in FIG. 2) of the add-on module 24, and a call. It is determined whether the signal is a signal for notifying the above, or a code for requesting uplink data (that is, the above-described uplink data output request signal). As a result of analyzing the uplink data, if it is determined that the code is a general downlink code, the downlink data / uplink request analysis unit 26f sends the downlink data to the downlink data processing unit 26g. On the other hand, when the downlink data is analyzed and it is determined that the code is a request for uplink data, the downlink data / uplink request analysis unit 26f sends an uplink data transmission command signal generated based on the downlink data to the uplink data transmission unit. 26a.

The downlink data processing unit 26g reads the downlink data transmitted from the downlink data / uplink request analysis unit 26f. Then, a signal processing operation based on the read downlink data is performed. The signal processing operation performed by the downlink data processing unit 26g based on the downlink data includes, for example, the above-described LE
The output of the D lighting control signal to an LED drive circuit (not shown) is exemplified.

The normally open contacts 30a to 30t are respectively connected to the keyboard shown in FIG.
20 one-touch keys AD1 to AD20 arranged on 30
When one of these 20 one-touch keys is pressed, the corresponding normally open contact is closed. In the present embodiment, the twenty one-touch keys AD1 to AD20 described above are:
Short dial data stored in advance in the RAM 9 or the like of the central control circuit 6 shown in FIG. 1 is assigned as a one-touch key for accessing. As is clear from the contents already described, each one-touch key AD1 to AD20
Each has a built-in LED (not shown), and each of these LEDs (not shown) is turned on by the above-described LED drive circuit. Each of the normally open contacts 30a to 30t outputs a predetermined electric signal to the key input means 26d when closed. Key input means 26d
When a predetermined electric signal is given from the normally-open contact that is closed by closing any one of the normally-open contacts 30a to 30t, the electric signal is received and output to the up-code generating means 26c. It is configured.

The upward code generating means 26c reads a predetermined electric signal output from the closed normally open contact through the key input means 26d. Then, based on the read electric signal, a code corresponding to the read electric signal (that is, an up code as described above. Here, the up code is
Control data given from the CPU 26 of the add-on module 24 to the CPU 7 of the main device 1. The control data includes any one of the speed dial data stored in the predetermined storage area of the RAM 9 described above. (There is key input data for reading one). The uplink code creating means 26c sends the created uplink code to the uplink data transmitting means 26a.

The uplink data transmission / prohibition signal receiving means 26b receives the signal output from the uplink prohibition / permission signal generation means 13f,
This is transmitted to the uplink data transmitting means 26a. In other words, when the ADM upstream prohibition signal is given from the upstream prohibition / permission signal generating means 13f, the ADM upstream prohibition signal is output.
When the ADM upstream permission signal is given from the permission signal generating means 13f, the ADM upstream permission signal is transmitted to the upstream data transmitting means 26a.

The uplink data transmitting means 26a periodically checks whether or not the above-mentioned uplink data transmission command signal has been transmitted from the downlink data / uplink request analysis means 26f. When the uplink data transmitting unit 26a determines that the uplink data transmission command signal has been transmitted from the downlink data / uplink request analyzing unit 26f as a result of the periodic check, the uplink data transmitting unit 26a performs the uplink code generation. It is checked whether or not the upstream code (that is, the input data described above) is transmitted from the means 26c. As a result of the above check, since the upstream code generating means 26c recognizes that the upstream code has been transmitted, the control data corresponding to the upstream code (that is, as described above, the CPU 26 sends the RAM 9 or the like to the main device 1). When it is determined that it is necessary to transmit control data for accessing speed dial data stored in advance in the upstream data transmission / inhibition signal receiving means 26b
It checks which of the ADM upstream permission signal and the ADM upstream inhibition signal is being transmitted. As a result of this check, when recognizing that the ADM uplink permission signal has been transmitted, the control unit outputs the read uplink code and the corresponding control data to the AND circuit 25 as the ADM uplink data,
The ADM upstream data is provided from the upstream data transmitting means 26a to the AND circuit 25 in the form of serial data. At this time,
From the upstream code transmission means 13g of the key telephone 10, the DKT
Dummy data of logic level “H” (“FF
Since H ″) is output, the ADM upstream data transmitted from the upstream data transmitting unit 26a to the AND circuit 25 is supplied from the AND circuit 25 to the data transmitting unit 11 in the form as it is.

On the other hand, the upstream data transmission / inhibition signal
When recognizing that the uplink prohibition signal has been transmitted, the uplink data transmitting means 26a regardless of whether the uplink code is transmitted from the uplink code creating means 26c,
Dummy data of logic level “H” (“FFH”) is output to the AND circuit 25 as ADM upstream data.

The AND circuit 25 outputs a logical level signal (ie, the above-described D
KT upstream code) and a logical level signal (that is, the above-mentioned ADM upstream data) output from the upstream data transmitting means 26a of the add-on module 24,
An AND operation of these two logic level signals is performed. Then, the result of this AND operation is used as a logic level signal,
The data is output to the data transmission means 11 of the key telephone 10. For example, from the upstream data transmitting means 26a to the AND circuit
When key input data is sent as ADM upstream data to one input terminal of the AND circuit 25, a signal of a logic level "H" is output as dummy data from the upstream code transmitting means 13g to the other input terminal of the AND circuit 25 (FIG. “FFH”) continues to be output. Therefore, in this case, the key input data transmitted from the uplink data transmitting unit 26a is output from the AND circuit 25 to the data transmitting unit 11. On the other hand, the up code transmission means 13g of the key telephone 10
When various control data is sent as uplink data to the other input terminal of the circuit 25, a signal of logic level “H” is sent from the uplink data transmitting means 26a to one input terminal of the AND circuit 25 as dummy data. (“FFH”) continues to be output. Therefore, in this case, various control data transmitted from the uplink code transmission unit 13g is output from the AND circuit 25 to the data transmission unit 11.

Next, transmission and reception of control data between the key telephone 10 and the add-on module 24 and the main device 1 will be described with reference to timing charts shown in FIGS. 3 and 4 and FIG. 5 (A). This will be mainly described with reference to the flowchart of the CPU 13 shown in FIG. 5, the flowchart of the CPU 26 shown in FIG. 5 (B), and the operation explanatory diagram of the key telephone apparatus shown in FIG. The following description is based on the state in which the key telephone 10 can perform office line communication, that is, the key telephone 10
Is assumed to be capturing station lines 17a and 17b through the main unit 1.

In FIG. 1, the central control circuit 6 sends the key telephone 10
When the control data is output, the control data
The data is sent to the key telephone interface unit 4 through the data highway. The control data is organized into one frame of serial data together with the PCM signal (voice signal data) transmitted from the time switch 3 in the key telephone interface unit 4 (see FIG. 3A). The state 1 shown in FIG. 3 (a)
The serial data of the frame is transmitted from the key telephone interface unit 4 to the data transmission means 11 of the key telephone 10.
Sent to The serial data described above is separated by the data transmission means 11 into a PCM signal (audio signal data) and control data. PCM signal (audio signal data)
Is transmitted from the data transmission means 11 to the transmission / reception circuit system 12, while the control data is transmitted from the data transmission means 11 to the CPU 13
And sent to the CPU 26. In CPU13 side of downlink data / uplink request analysis unit 13b, CPU 26 side of the downstream data / uplink request analysis unit 26f time t _1, during the control data, detects that contains uplink data output request signal ( Third
FIG. 5A (FIG. 5A 101), (FIG. 5B step 111). Here, when the upstream code transmitting unit 13g determines that it is necessary to send various control data from the key telephone 10 side to the main device 1 side by receiving the above upstream code from the upstream code generating unit 13e, (FIG. 5 (A) steps 102 and 103), the upstream prohibition / permission signal generating means 13f transmits an ADM upstream prohibition signal of logic level "H" to the upstream data transmission / prohibition signal receiving means 26b (FIG. FIG. 3 (c) (FIG. 5 (A) step 104)
reference).

On the other hand, when the uplink data transmitting unit 26a determines that it is necessary to send various control data from the add-on module 24 side to the main device 1 side because the uplink code is given from the uplink code creating unit 26c. (FIG. 5 (B), steps 112 and 113), whether an ADM upstream prohibition signal of logic level "H" is transmitted from the upstream prohibition / permission signal generating means 13f to the upstream data transmission / prohibition signal receiving means 26b. Check whether or not (Fig. 5 (B)
Step 114, Step 115). AD of the above logic level “H”
When the M upstream inhibition signal is output from the upstream inhibition / permission signal generating unit 13f to the upstream data transmission / inhibition signal receiving unit 26b, the upstream data transmission / inhibition signal receiving unit 26b is output.
b is a logical level “H” with respect to the uplink data transmitting means 26a.
Since the output of the ADM upstream prohibition signal is continued (the fifth
(B) step 117), the uplink data transmitting means 26a
A signal of logic level “H” (ie, dummy data: “FFH”) is supplied as an ADM upstream data based on the M upstream inhibition signal to the AND circuit 2.
5 is sent to one input terminal. In other words, even if the above-described upstream code is transmitted from the upstream code generation unit 26c, the upstream data transmission unit 26a does not output the transmitted upstream code as ADM upstream data to one input terminal of the AND circuit 25. (See FIG. 3 (d)). Therefore, when various control data is output from the uplink code transmitting means 13g to the other input terminal of the AND circuit 25, the various control data is
The output from the AND circuit 25 is given to the main device 1 through the data transmission means 11 (FIG. 3 (b)) and FIG. 5 (A) step 105 (see step 105).

While in CPU13 side of downlink data / uplink request analysis unit 13b time t _2, detects that it contains the upstream data output request signal in the control data sent from the data transmission means 11, and the uplink code transmitting means 13g determines that there is no need to send various control data from the key telephone 10 to the main unit 1 because the upstream code is not given from the upstream code generator 13e (fifth embodiment).
(A) step 103), upstream prohibition / permission signal generation means 1
3f means to continuously output the ADM uplink permission signal of the logic level "L" to the uplink data transmission / inhibition signal receiving means 26b (FIG. 3 (C)), (FIG. 5 (A) step 106).
reference). As a result, the uplink data transmission / prohibition signal receiving means 26b continues to output the ADM uplink permission signal of the logical level "L" to the uplink data transmitting means 26a (step 116 in FIG. 5B). In this state, when any of the above-described one-touch keys AD1 to AD20 is pressed by a speaker or the like, the key input data corresponding to this pressing operation is transmitted from the upstream code creating unit 26c in the form of serial data. When given to the transmitting means 26a, the upstream data transmitting means 26a
The upstream code from the upstream code generation means 26c is sent to one input terminal of the AND circuit 25 as M upstream data (FIG. 3 (d)). On the other hand, the upstream code transmission means 13g is DKT
A signal of a logic level "H" (ie, dummy data: "FFH") is sent to the other input terminal of the AND circuit 25 as an up code (FIG. 3 (b)), (step 10 in FIG. 5 (A)).
7).

Therefore, the ADM upstream data transmitted from the upstream data transmitting unit 26a to one input terminal of the AND circuit 25 is directly provided to the main device 1 through the data transmitting unit 11 as an output from the AND circuit 25.

FIG. 4 shows that the upstream prohibition / permission signal generation means 13f provides an ADM upstream permission signal to the upstream data transmission / prohibition signal reception means 26b, and the upstream code transmission means 13g provides the AND circuit 25 with a logic signal as dummy data. Level “H” signal (“FF
H ") is a timing chart showing a mode of a logical product operation performed by the AND circuit 25. FIG. 4A shows dummy data output from the uplink code transmitting means 13g. in, the dummy data is 8 bits between and start and stop bits start bit and a stop bit at the logical level _{"L" (b 0, b} 1, b 2, b 3, b 4, b 5 , b ₆ , b ₇ ) are signals of the logic level “H.” FIG.
shows the key input data output from a, the key input data, a start bit and stop bit, and b _1-bit and b ₅ bits and a logical level "L"
Each bit of b ₀ , b ₂ , b ₃ , b ₄ , b ₆ , b ₇ is a signal of the logic level “H”. FIG. 4 (C) shows a logical level signal output from the AND circuit 25. This logical level signal corresponds to the dummy data shown in FIG. 4 shows the result of a logical AND operation between the key input data shown in FIG. 4 (B). As is clear from the contents already described, the uplink code transmitting means 13
Since dummy data is output from g, the output signal from the AND circuit 25 shown in FIG. 4 (C) is the same as the key input data output from the uplink data transmitting means 26a.

In this way, the key input data described above is converted into a logical level signal as shown in FIG.
Is output to the central control circuit 6 through the data transmission means 11, the key telephone interface unit 4, and the data highway. When the key input data is given to the central control circuit 6, CP
The down data / up request data transmission means 7e of U7 reads the abbreviated dial data of the address corresponding to the key input data from among the abbreviated dial data stored in the storage area of the RAM 9 in advance. The abbreviated dial data read by the downlink data / uplink request data transmission means 7e is transmitted to the office lines 17a and 17b through the data highway and the office line interface unit 2 (see FIG. 6).

As described above, according to one embodiment of the present invention, the uplink data transmission / inhibition signal receiving means 26b, the uplink data transmitting means 26a, and the AND circuit 25 control the control data from the uplink code transmitting means 13g of the key telephone 10. Can be prioritized over the transmission of the control data output from the upstream data transmitting means 26a. Therefore, the number of components of the circuit constituting the add-on module 24 can be reduced by the conventional method shown in FIG. The number of components of the circuit constituting the add-on module 14 can be greatly reduced.

〔The invention's effect〕

As described above, according to the present invention, each of the key telephones has a plurality of keys for enhancing the function of each key telephone, and a key provided by operating these keys. Control data corresponding to the input signal, to each of a plurality of add-on modules that are to be sent to the main device, receive the downlink control data output from the main device, in the downlink control data Data analysis means for analyzing whether or not an uplink data output request signal indicating a control data output request to the terminal is included; and receiving the control data given by operating the key, the data analysis means And an analysis result indicating that the upstream data output request signal has been given is output from the control unit of the corresponding key telephone set. When given, control data output means for outputting the received control data, and when the control unit sends a control data output inhibition signal to the control data output means, the control data output from the control unit is output. A control unit that selectively outputs control data output from the control data output unit to the main device when the control unit sends a control data output permission signal to the control data output unit; Data output selection means, the selective adjustment of the transmission of control data from the key telephone to the main unit and the transmission of control data from the add-on module side can be realized with a small number of parts. A key telephone device provided with a simple add-on module can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a key telephone apparatus to which one embodiment of the present invention is applied, and FIG. 2 shows a keyboard provided in an add-on module according to one embodiment of the present invention. FIGS. 3, 3 and 4 are timing charts showing modes of transmission and reception of various signals in the key telephone apparatus according to one embodiment of the present invention, and FIG. 5 (A) is according to one embodiment of the present invention. FIG. 5B is a flowchart showing the control operation of the CPU of the key telephone, FIG. 5B is a flowchart showing the control operation of the CPU of the add-on module according to one embodiment of the present invention, and FIG. FIG. 7 is an operation explanatory view of the key telephone apparatus according to the embodiment, and FIG. 7 is a block diagram showing an overall configuration of a conventional key telephone apparatus. 1 Main device, 10 Key telephone, 13 CPU, 17a, 1
7b ... office line, 25 ... AND circuit, 26 ... CPU, 26a ... uplink data transmission means, 26b ... uplink data transmission / prohibition signal reception means, 26c ... uplink code creation means, 26e ... downlink data Receiving means, 26f: Downlink data / uplink request analysis means, 3
0a to 30t: normally open contacts, 55a to 55x: normally open contacts.

Claims (1)

(57) [Claims] A control unit for generating and outputting control data corresponding to an input signal by a key operation or an input signal by a button operation, and a plurality of add-on modules for enhancing the function of the key telephone are provided separately. A plurality of key telephones configured to be connectable, and a plurality of keys respectively connected to the respective key telephones, and a plurality of keys for enhancing the function of the respective key telephones. A plurality of add-on modules configured to generate and transmit control data corresponding to a given key input signal, and connected to a central office line to exchange control data with the control unit or the add-on module By doing so, an extension call that exchanges and connects the plurality of key telephones with each other and an office call that exchanges and connects each of the key telephones with the office line are established. The add-on module receives downlink control data output from the main device and includes an uplink data output request signal indicating a control data output request to a terminal in the downlink control data. Data analysis means for analyzing whether or not the key is operated, and an analysis result indicating that the uplink data output request signal is given from the data analysis means in response to control data given by operating the key. Is output and a control data output permission signal is given from the control unit of the corresponding key telephone set, the control data output unit outputting the received control data, and the control unit transmits the control data output unit to the control data output unit. When the control data output inhibition signal is sent, the control data output from the control unit is output, and the control unit outputs the control data output signal. Control data output selection means for selectively outputting control data output from the control data output means to the main device when a control data output permission signal is transmitted to the means. Characteristic key telephone device.