JPS6058761A - Network controller - Google Patents

Abstract

PURPOSE:To ensure an operation and also to decrease the cost and to attain economy by allowing a polarity inversion detecting means to be used in common for the detection of a busy state, response detection of an opposite party, incoming call detection and call signal detection. CONSTITUTION:When a sensor S is responded, a control section CO decects the state of a potential of output lines 1, 2 of the polarity inversion detecting means DT. When a telephone set TEL is busy, since a talking current is fed to the TEL from a line side, the photocoupler PC2 of the polarity inverting detecting means DT is turned on, the output line 2 is brought into a low level to detect the busy state. When both output lines 1, 2 are at a high level, a non-talking state is detected, the control section CO gives a positive voltage to an output line 5 so as to activate a relay A. When an incoming call exists, a terminal L2 is made positive, the control section CO restores the relay A for a prescribed time so as to form an AC loop inserted with a capacitor C. When a call signal is incoming, since the photocouplers PC1, PC2 are flickered alternately, the automatic dial calling is inhibited if the potential change of the output lines 1, 2 is detected by the control section CO so as to prevent the collision with the incoming call.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a network control device that performs automatic dialing. In particular, it is intended to economically configure the circuit.

Conventionally, this type of device has been implemented, for example, in an emergency notification device, and is configured to automatically dial a call in response to a sensor response and transmit the sensor status to a predetermined location via a telephone line.

In this case, prior to making an automatic dialing call, it is detected whether or not the answering means (usually a telephone) that responds to an incoming call from the line is in operation, so-called a call is in progress, and the automatic Since a means for detecting the response of the other party after dialing is provided, and each means is constituted by an individual circuit, there is a limit to economic efficiency.

The present invention has been devised in view of this point, and provides a network control device that operates reliably and is inexpensive by sharing circuits.

The figure is a block diagram showing an embodiment of the present invention.

L2 is a connection terminal with the line, TEL is a telephone as a response means for responding to an incoming call from the line, DT is a polarity reversal detection means, LA is a transmission section, CO is a control section, A,
D is an automatic dialing section using pulses, S is a sensor, and PB is an automatic dialing section using MP multiplication signals.

Next, to explain the operation and other symbols in detail, when there is a response of the sensor S, the control unit CO is driven, and the control unit CO is connected to the output line 1 of the polarity reversal detection means DT.
, 2 is detected.

At this time, if both output lines 1 and 20 are at the no level (+), the next operation will proceed, but if either one is at the low level (earth level), the next operation will be canceled. , prohibits the automatic dialing operation described below.

That is, when the telephone T E L is in the middle of a call, the telephone T E T is supplied with call current from the line side via the contact cml of the relay CML and the polarity reversal detection means DT, so that the polarity ( Normally, the photocoupler PC2 of the polarity reversal detecting means DT is turned on in the next circuit by Ll (-), and the output line 2 is set to a low level, so that a call is detected.

Terminal L1-Contact cml-Telephone T E L-Contact cml
- Photocoupler PCI terminal L2 Therefore, when both output lines 1 and 2 are at the NO level, a non-talking state is detected, and the control unit CO proceeds with the next operation.

That is, 10 is applied to the output line 5 to operate the relay A.

This switches contact a, so that contact dp of relay DP as dial pulse sending means is prepared on the line side, and polarity reversal detection means DT is connected to the line with high impedance by resistor R, forming a closed loop.

At this time, terminal L1 on the line side is normally set to 10, but
When there is an incoming call, this is reversed and terminal L2 becomes 10. Therefore, if the output line 2 is at a low level, the control unit CO will proceed with the next operation, but if the output line 1 is at a low level, the control unit CO will not be called by the above-mentioned incoming call for a certain period of time (for example, 3 seconds). Check the arrival of the signal -3=. Therefore, a timer TM set to "3 seconds" is driven via the output line 8.

Then, the control unit CO controls the relay A until the timed output sent from the timer TM after 3 seconds is output from the output line 9.
is temporarily restored, and an AC loop is formed by inserting a capacitor C into the closed loop. Note that if the telephone terminal is always connected, an AC loop passing through the telephone circuit is formed, so in that case, the capacitor C may be omitted.

When a calling signal arrives at the above AC loop, the photocoupler P
Since CB and PC2 flash alternately, if a change in the potential of output lines 1 and 2 is detected, the control unit CO prohibits the automatic dialing operation described later to prevent a collision with an incoming call.

If no change in the potential of the output lines 1 and 2 is detected, it is determined that the polarity (+ of terminal L2) is not due to an incoming call (for example, it may be due to a connection error, etc.), As the next operation, the state of the potential of the output line 1.2 at that time is stored in the storage means M (for example, a flip-flop), and +4- is applied to the output line 6 to operate the relay CML.

Next, a signal is sent to the output line 7, and the automatic dialing section AD
to drive. The automatic dialing unit AD sequentially reads dial numbers set in advance for automatic dialing,
The relay DP is operated intermittently according to the number. That is, a dial pulse is sent out by the contact dp, and an automatic dialing operation is performed. Please note that the telephone line is PB.
The control unit CO is set in advance to send a signal to the output line 3 in the case of the MF double signal to operate the automatic dialing unit PB using the MP double signal. When the transmission is completed, the control unit CO restores the relay A, connects the transmission unit LA to the line side, and stores the potential states of the output lines 1 and 2 of the polarity reversal detection unit DT in the storage unit M. Monitor the other party's response by comparing it with the state in which it was received.

If polarity reversal from the above-mentioned memorized state is detected (response detection), a signal as response information of the sensor S is transmitted to the output line 4.
This is then sent from the transmission section LA to the called party.

As explained above, according to the present invention, there is provided a response means for responding to an incoming call from a line, an automatic dialing sending means for sending a dial number to the line when an automatic dialing call is made,
In the network control device, the network control device includes a polarity reversal detection means for detecting the polarity of a line, and a control section for controlling the automatic dialing means to prohibit the calling operation based on the output of the polarity reversal detection means. The transmission section connected to the line after the calling operation of the dial sending means is connected to the line via the polarity reversal detection means, and the response means is also connected to the line via the polarity reversal detection means. By configuring the polarity reversal detection means as described above, the polarity reversal detection means serves both as a call-in-progress detection and a response detection of the called party, and furthermore, prior to the automatic dialing operation, the polarity reversal detection means is connected to a high impedance line with respect to the line. By connecting in a loop, the polarity reversal detection means can serve as the function of detecting a call in progress, detecting a response from the other party, and detecting an incoming call, so that the network control device can be constructed at a lower cost than in the past. Can be done.

[Brief explanation of drawings]

The figure is a block diagram of a network control device implementing the present invention. DT...Polarity reversal detection means, LA...Tune transmission unit CO...Control unit, AD, PB...Tune 1 movement dial unit S...Sensor Patent applicant Daiko Denki Seisakusho Co., Ltd. Chief Representative 1) Takehiko

Claims (1)

[Claims] 1. A response means for responding to an incoming call from a line, an automatic dialing sending means for sending a dial number to the line when an automatic dialing call is made, a polarity reversal detecting means for detecting the polarity of the line, and the polarity reversal. In a network control device comprising: a control section configured to inhibit the calling operation of the automatic dialing sending means based on the output of the detecting means, a transmission section connected to the line after the calling operation of the automatic dialing sending means; is connected to the line via the polarity reversal detection means, and the response means is also connected to the line via the polarity reversal detection means, and the polarity reversal detection means is connected to the line via the polarity reversal detection means prior to the automatic dialing operation. is connected to the line through an alternating current loop and a high impedance loop, so that the polarity reversal detection means serves as a call-in-progress detection, a response detection from the other party, an incoming call detection, and a ringing signal detection. network control device.