JPS647557B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electronic button telephone device in which a current supply line for supplying current to a telephone also serves as a data line for exchanging data with the telephone.

Conventional configuration and its problems Electronic button telephone devices in which the current supply line that supplies current to the telephone also functions as a data line that exchanges data with the telephone are generally known; In both cases, a display element such as a light emitting diode is connected to a current supply circuit that supplies current to the telephone, and the display element indicates that current is being supplied to the telephone. However, with this type of device, the display element is simply connected to the current supply circuit, so if the phone malfunctions for some reason, or the current supply line itself malfunctions for some reason and shorts out, it will not work. However, the display element lights up in the same way as if it were supplying current to the telephone, and there was a problem in that the distinction between these was completely unclear.

Purpose of the Invention The present invention eliminates the above-mentioned drawbacks of the conventional technology and provides an excellent electronic system that can accurately distinguish and display the usage status of the telephone, malfunction of the telephone, short circuit of the current supply line, etc. with a simple configuration. The purpose of this invention is to provide a button telephone device.

Structure of the Invention The present invention includes a detection circuit that detects when a normal current flows in a current supply circuit and a circuit that detects when an overcurrent flows, and connects the output of these detection circuits and the telephone set. The telephone is configured to accurately distinguish the use status, malfunction, etc. of the telephone by using the output of the means for detecting whether or not data is being exchanged, and to display the information on a single display element.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 is a block diagram of main parts of an embodiment of the electronic key telephone device of the present invention, in which 1 is a main device, 2 is a telephone, and 3 is a telephone provided in the main device 1. 2 is a fuse for overcurrent protection inserted into a current supply line for supplying current; 4 is a fuse for overcurrent protection when a normal value of current is flowing through the current supply line;
A normal current detection circuit 5 outputs a predetermined signal at the output end, and 5 is an overcurrent detection circuit that detects when an overcurrent exceeding the normal value flows in the current supply line and outputs a predetermined signal to the output end. A current detection circuit, 6 is a transformer that superimposes data on the current supply line and sends and receives data, and 7 is connected to the transformer 6 and performs various controls for the telephone exchange while sending and receiving data with the telephone 2. A microcomputer, 8 a display element such as a light emitting diode connected to the microcomputer 7 and driven by its output, 9 a cable serving as a telephone supply line and a data line, 10 a transformer provided on the telephone 2 side, 11 is a microcomputer that is connected to the transformer 10 and exchanges data with the main device 1.

The microcomputer 7 is configured to perform various controls for telephone exchange, and also to drive the display element 8 in different states using the outputs of the detection circuits 4 and 5 and the state of data exchange with the telephone 2. has been done. Further, although the microcomputer 11 on the telephone 2 side is not shown, the dial button detects the operation status of other operation buttons, etc., and exchanges data with the main device 1 according to each status. It is configured as follows.

In the embodiment described above, when the telephone set 2 is normal, the current value flowing therein is a normal value within a predetermined range, and this is detected by the normal current detection circuit 4. In this state, phone 2
If the microcomputer 7 is in use, the microcomputer 7 itself detects this by exchanging data with the telephone 2, and causes the display element 8 to light up continuously as shown in FIG. 2A. If the telephone 2 is not in use, the microcomputer 7 causes the display element 8 to blink at a high speed as shown in FIG. 2B based on the data at that time. If data exchange with the telephone 2 becomes abnormal, this will also cause the microcomputer 7 to
The microcomputer 7 causes the display element 8 to blink at a slow speed as shown in FIG. 2C.

If the telephone 2 malfunctions for some reason or the cable 9 malfunctions for some reason and the current supply line is shorted, the current flowing through the current supply line will far exceed the normal value within the predetermined range. As a result, a predetermined output appears from the overcurrent detection circuit 5. Accordingly, the microcomputer 7 determines that the current supply line is short, and causes the display element 8 to blink intermittently as shown in FIG. 2D. If the telephone 2 is disconnected or the cable 9 is cut, no output will appear from either the normal current detection circuit 4 or the overcurrent detection circuit 5, so the microcomputer 7
As a result, it is detected that the telephone 2 is removed or the cable 9 is cut, and the display element 8 is turned off as shown in FIG. 2E.

In this way, according to the above embodiment, a normal current detection circuit and an overcurrent detection circuit are provided in the current supply line,
The output of these detection circuits is used to make each display element blink in a different state, and it is possible to detect whether the phone is in use, not in use, abnormalities in the current supply line, etc. of the display element. It can be easily detected by the blinking state, and is extremely useful for maintenance, service, and other purposes.

Effects of the Invention As is clear from the above embodiments, the present invention provides a normal current detection circuit that outputs a predetermined signal when the current value flowing in the current supply line is a normal value, and a An overcurrent detection circuit that outputs a predetermined signal when the value exceeds the normal value, a means for detecting the state of data exchanged with the telephone, and the output of these detection circuits and the detection means. The device is equipped with a means for lighting up one separately provided display element in different states depending on whether the telephone is in use, not in use, abnormal state of the current supply line, etc. It is possible to easily determine whether the telephone is in use, not in use, malfunction of the telephone, malfunction of the cable, etc. by the blinking state, and it can be easily displayed without the need for many separate display elements, making it extremely practical. It is advantageous.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the electronic key telephone device of the present invention, and FIG. 2 is an explanatory diagram of the operation of the device. 1...Main device, 2...Telephone, 3...Fuse, 4...Normal current detection circuit, 5...Overcurrent detection circuit, 6, 10...Transformer, 7, 11...Microcomputer, 8... Display element, 9...cable.

Claims (1)

[Claims] 1. A normal current detection circuit that is inserted into a current supply line to the telephone and detects whether the current value flowing through the current supply line is within a predetermined normal value; an overcurrent detection circuit that detects when an excessive current exceeding a normal value is flowing; means for detecting the state of telephone exchange data exchanged with the telephone; and these detection circuits; The use state, non-use state, normal state, abnormal state, etc. of the above-mentioned current supply line of the telephone are detected by the output of the detection means, and one separately provided display element is displayed in different states according to these states. An electronic button telephone device comprising means for flashing.