JPH02143769A - Modem - Google Patents

Abstract

PURPOSE:To reduce the power consumption by detecting an incoming state from a communication line with an incoming call detection circuit, operating a power supply automatic starting control section with an incoming detection signal and supplying a power supply to a data terminal equipment of a MODEM respectively. CONSTITUTION:The incoming state from a communication line is detected by the incoming call detection circuit 22 and the detection signal operates the power supply automatic raising control section 23 so as to supply a power supply to both the MODEM 12 and a data terminal equipment 17. Thus, the power is supplied to the MODEM 12 at data communication only. Thus, the power consumption is reduced in comparison with the MODEM 12 consuming power also in other state than the data communication.

Description

Detailed Description of the Invention (Objective of the Invention) (Industrial Application Field) The present invention connects to various data terminal devices such as POS and pan controllers, and performs data communication using communication circuits such as telephone lines. Concerning modems.

(Prior Art) Various data terminal devices such as POS and personal computers are connected to a communication line such as a telephone line via a modem, and perform various data communications using this communication line. The relationship between the data terminal device and the modem will be explained with reference to FIG.

In FIG. 2, a modem 11 is mainly composed of a modem section 12 having a modulation/demodulation function, and is connected to a communication line and a communication terminal (not shown) via an interface 13 and a communication connector 14.

A power supply section 15 is connected to an external power supply and supplies operating power to the modem section 12.

Reference numeral 17 denotes a data terminal device such as a POS or a personal computer, which is connected to a communication line via the modem 11 and performs data communication using this communication line. 18 is an automatic power start-up device,
A power supply section 19 for the data terminal device 17 is built-in. This power supply automatic start-up system @18 is the data terminal device 17.
The data terminal device 17 is operated by inputting the C1 signal from the power supply section 19 connected to an external power source, and starts up the data terminal device 17 by supplying power from the power supply section 19 connected to an external power source.

In the above configuration, when data is sent from a communication line such as a telephone line, it is exchanged into a signal containing a CI signal within the modem 11 and sent to the data terminal device 17. At this time,
Data terminal bag @17 is not powered on, so CI
The signal is sent to the automatic power supply start-up device 18 via the data terminal device 11. The automatic power supply start-up device 18
It operates by inputting the I signal, and supplies power to the data terminal device 17 from its power supply section 19 to start it up.

(Problem to be Solved by the Invention) In the above configuration, the modem 11 and the automatic power supply start-up device 1
Power must be constantly supplied to both sides.

In particular, the modem 11 consumes power in areas other than the data communication section, resulting in increased power consumption. Furthermore, since the CI signal is sent from the modem 11 to the automatic power supply start-up device 18 via the data terminal device 17, a signal cable for this purpose is required, which increases the wiring cost. Furthermore, since each of the modem 11 and the data terminal bag @17 has a power supply section 15 or 19, there is a problem that the entire device becomes larger.

SUMMARY OF THE INVENTION An object of the present invention is to provide a modem with reduced power consumption and a simplified configuration and space saving by sharing parts.

[Structure of the invention]

(Means for Solving the Problems) A modem according to the present invention has a modem section connected to a communication line, and the modem section transmits data to and from a data terminal device. It has an incoming call detection circuit that detects an incoming call state, and an automatic power supply start-up control unit that operates based on an incoming call detection signal from the incoming call detection circuit and supplies power to the modem unit and data terminal device, respectively.

(Function) In the present invention, the incoming call detection circuit detects the incoming call from the communication line, and the incoming call detection signal operates the automatic power supply start-up control unit to supply power to the modem unit and data terminal device, respectively. Unlike the conventional modem section, the modem section does not constantly consume power even in functions other than the data communication section, and power consumption is reduced. Furthermore, since the power supply section for the modem section and the data terminal device can be shared, simplification and space saving can be achieved by sharing parts. Furthermore, unlike in the past, it is not necessary to send the CI signal to the automatic power supply start-up device via the data terminal device, so these signal cables are no longer necessary, and wiring costs are also reduced.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, a modem 21 has a modem section 12 having a modulation/demodulation function as in the past, and is connected to a communication line (not shown, such as a public line or private line) such as a telephone line through an interface 13 and a communication connector 14. Connect. Data is then transmitted between data terminals such as POS and personal computers.

Reference numeral 22 denotes an incoming call detection circuit, which is provided in the modem 21 and detects the state of incoming data from the communication line via the interface 13.

Reference numeral 23 denotes an automatic power supply start-up control section, which is also provided in the modem 21 and is connected to the modem section 12 and the data terminal device 1.
7 has a built-in common power supply section 24. The automatic power supply start-up control section 23 operates when the incoming call detection circuit 22 receives a detection signal, that is, a CI signal, which is generated when the incoming call detection circuit 22 detects an incoming call from the communication line. Power is supplied to each of the data terminal devices 17 to start them up.

In this way, the incoming call detection circuit 2 detects the incoming call status from the communication line.
2, and this detection signal operates the power supply automatic start-up control section 23 to supply power to both the modem section 12 and the data terminal device 17 from the common power supply section 24. Power is supplied only during data communication, and compared to the conventional modem unit 12 which consumes power even in areas other than the data communication unit.
Energy consumption is reduced. In addition, the power supply section 24 is connected to the modem section 1
2 and the data terminal device 17,
Simplification and space saving are possible by sharing parts. Furthermore, unlike in the past, the C1 signal for start-up operation is not sent via the data terminal device 17.
This eliminates the need for communication cables and reduces wiring costs.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reduce power consumption, simplify the configuration by sharing parts, save space, and reduce wiring costs.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a modem according to the present invention, and FIG. 2 is a block diagram showing a conventional modem. 12...Modem section, 17...Data terminal device, 21...
Modem, 22... Incoming call detection circuit, 23... Automatic power supply start-up control unit. Preface

Claims (1)

[Claims] (1) In a modem that has a modem section connected to a communication line and transmits data to and from a data terminal device using this modem section, an incoming call detection circuit that detects the state of incoming calls from the communication line; 1. A modem comprising: an automatic power supply start-up control section that operates in response to an incoming call detection signal from a detection circuit and supplies power to the modem section and data terminal device, respectively.