JPH0683322B2 - Button telephone device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key telephone device in which a main device is distributed.

2. Description of the Related Art A main device is always installed in a system that constitutes a conventional button telephone device, and monitoring and control is performed by transmitting and receiving data to and from each telephone, so that a call between a central line and a telephone or between telephones can be performed. It had the function of a button telephone device that could be connected.

Problems to be Solved by the Invention However, the above-mentioned conventional button telephone device has a problem that it is not suitable for a home telephone or the like used at home because the main device is large in size and the installation place is difficult.

The present invention solves such a problem, and an object of the present invention is to provide a button telephone device which eliminates a large main device and has a conventional control and monitoring function between telephones.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention has a state change command indicating the start and end of a call operation, and a diagnostic command which is transmitted at a constant time interval when a station line is in use. A data sending section, and a data receiving section which, while receiving this diagnostic command from another telephone, displays that the other telephone is in use of a station line and then returns to the standby state when the above state change command is received, When the diagnostic command is not received a predetermined number of times, a control unit is provided to turn off the display indicating that the station line is in use and determine the standby state.

OPERATION The present invention has the effect that the above-described configuration enables mutual extension and control between the extension telephones and eliminates the need for a centralized and large-scale main device.

Embodiment FIG. 1 to FIG. 5 show an embodiment of the present invention, and FIG. 1 shows a system configuration. In FIG. 1, TEL1 to TEL N are respectively connected to an office line. A telephone is a telephone, P is a power source for controlling extension telephone calls and each telephone,
Each telephone is connected to the office line T / R and the extension power line H / L.

FIG. 2 shows a functional block diagram which constitutes a main part of each telephone, and includes a relay contact a for connecting a communication path, a hook switch H · S ₁ , a dial 1, a communication circuit 2, a data receiving section 3, and a data transmission. It is composed of a unit 4, a main control unit 5, a communication path connection relay 6, a key operation unit 7, and a own station number setting unit 8.

FIG. 3 shows the outline of the internal configuration of the main controller 5.

4 and 5 are a flow chart and a timing chart showing the operation.

Next, the above embodiment will be described. In the above embodiment, in order for the telephone TEL1 shown in FIG. 1 to talk with the central office line, the receiver is taken off, the hook switches H · S ₁ and H · S ₂ are closed, and the key operation unit 7 is operated, whereby the main control unit 5 is operated. Drives the call path connection relay 6 and closes the contact a. At this time, the main control unit 5 sends a status change command to the office line through the data sending unit 4 to inform the other telephones TEL2 to TEL N that the station line is being used, and the telephones TEL2 to TEL N send data. Receiver 3
The state change command is received and input to the main controller 5,
If the busy lamp 9 is turned on, and if confidential communication is set, each telephone cannot capture the local line by key operation. Then the hook switch H · S ₁ telephone TEL1 is returned to receiving machines, H · S ₂ is opened when the main control unit 5 opens the contacts a to open the speech path connection relay, this time the main control unit 5 data A status change command is sent from the sending unit 4 to the office line, and the other telephones TEL2 to TEL N
The busy lamp goes out, the standby state is restored, and the station line is ready for use.

According to the present invention, in this state, that is, when the telephone TEL1 is in use of the station line, the main control unit 5 sets the internal timer by a program so that the data sending unit 4 sends the diagnostic command to the station line at a constant time interval. It continues until the end of the talk. This state is shown in the flowchart (a) of FIG. 4 and the timing chart (A) of FIG. In the transmission data of TEL1 shown in the timing chart (A) of FIG. 5, a and c are status change commands indicating the start and end of the operation, and b is a diagnostic command. The above is the normal operating state of the system, but a communication error occurs due to line noise or data collision, for example, a status change command, in this case the end command c causes an error and the other telephones TEL2 to TELN If any or all of them cannot receive normally, another phone
For TEL2 to TELN, the timers that the main control unit 5 has internally are set by the program, so if the diagnostic command is not received multiple times, each phone turns off the busy lamp 9 and returns to the standby state. I am doing it. This state is shown in the flowchart (b) of FIG. 4 and the timing chart (b) of FIG. TE in Fig. 5 (B)
If the status change command c, which indicates the end of L1, that is, the relay contact a ends when the contact is opened, is not received due to an error, TEL2 to TEL N indicate that the busy lamp 9 is automatically extinguished after toff time. ing.

EFFECTS OF THE INVENTION As is apparent from the above embodiment, the present invention provides a data transmission unit having a state change command indicating the start and end of a call operation, and a diagnostic command to be transmitted at fixed time intervals when a station line is in use. , While receiving this diagnostic command from other telephones, it displays that the other telephones are using the central line and returns to the standby state when the state change command is received afterwards. If the internal line is not received a predetermined number of times, it is equipped with a control unit that erases the display indicating that the station line is in use and determines that it is in the standby state, so that it becomes possible to perform mutual control and monitoring between extension telephones. This has the effect of eliminating the need for a large-scale main device.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a system according to an embodiment of the present invention, FIG. 2 is a functional block diagram which constitutes a main part of a telephone of the system, and FIG. 3 is a schematic diagram showing an internal configuration of a main control unit of the telephone. It is a figure. FIG. 4 is an operation flowchart of the telephone, and FIG. 5 is an operation timing chart of the telephone. 1 ... Dial, 2 ... Call circuit, 3 ... Data receiving section, 4 ... Data transmitting section, 5 ... Main control section, 6 ... Call path connection relay, 7 ... Key operation section, 8 ... Own number setting part, 9 ... Busy lamp.

Claims (1)

[Claims] 1. A data transmission unit having a state change command indicating the start and end of a call operation, and a diagnostic command to be transmitted at a fixed time interval when a station line is being used, and receiving this diagnostic command from another telephone. Indicates that the other telephone displays that the station line is in use and returns to the standby state when the status change command is received thereafter, and if the diagnostic command is not received a predetermined number of times, the station A key telephone device provided with a control unit for erasing the display of the line being used and discriminating the standby state.