JPS5815356A - Control system for power supply of data communicating device - Google Patents

Abstract

PURPOSE:To connect a power supply to a terminal device only for data communication automatically and to save power consumption of a data transmitter, by using an output signal of a network controller and controlling the power supply of the data terminal device. CONSTITUTION:When a calling is received from an opposing station at a network controller 1 connected to a public communication line 6, a callout signal CI is outputted to a modulation and demodulation device (MODEM) 2. The signal CI from the device 2 is inputted to a power supply controller 3 as it is, the controller 3 detects the signal CI a callout signal CI1 is outputted to the device 2, and a callout signal CI2 is outputted to a data terminal device 4 from the device 2 and also the signal CI2 is applied to the controller 3 at the same time. When the signals CI and CI2 exist at the same time with the controller 3, the power supply 5 for the device 4 is applied. The device 2 receives a ready signal ER from the device 4, the line 6 is switched from the device 1 to the device 2 for communication. When the communication is finished, the signal ER is kept turn-off, the turning-off of the signal ER is detected with the controller 3 to interrupt the supply of the power supply 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to power control of a data communication device including a modulation/demodulation device using a telephone type public communication line.

Conventionally, the terminal device side of data communication using public communication lines has mainly consisted of a data terminal device, a network control device, and a modulation/demodulation device. These devices require a constant power supply during operating hours, and as the scale of the data terminal device increases, the overall power consumption increases.

The present invention utilizes the output signal of the network control device.

It is characterized by controlling the power supply of data terminal equipment.

The purpose is to provide a data communication device with low power consumption.

FIG. 1 shows one embodiment of the present invention, and FIG. 2 is a timing diagram of each part of FIG. 1. This operation will be explained below.

Network control unit (hereinafter referred to as NCU) connected to the public communication line
) 1 receives a call from the other party, it sends a call signal cr to the modem (hereinafter referred to as modem) 2 (Figure 2a).
Output. The modem 2 directly outputs the manually inputted calling signal CI to the switch power controller 3. The power supply controller 3 outputs the input calling signal CI and outputs the calling signal CII (FIG. 2b) to the modem 2. The modem 2 detects the calling signal CII and outputs the calling signal Cl2 (FIG. 2C) to the data terminal equipment (hereinafter referred to as DTE) 4 and at the same time to the power supply controller 3. The power supply controller 3 outputs the DTE417) power supply 5 when the call signal CI and the call signal CI2 are present at the same time.
(Fig. 2 d) is added. When the DTE 4 is powered on, it receives the call signal CI2 and outputs to the modem 2 a terminal device ready signal ER (FIG. 2e) indicating that preparations for data transmission and reception are completed. The ER multiplied signal received by the modem 2Vi is output as is to the power supply controller 3, and the power supply controller 3 detects the ER multiplied signal and outputs the ERI signal (FIG. 2 f) to the modem 2.

When the modem 2 call signals C1, 2 (C in Figure 2) and the ERI signal (F in Figure 2) are present at the same time, the 2 communication lines are connected to the NCU.
] side to the modem 2 side, that is, a line connection command CML (Fig. 2g) is output to the NCU 1 and also to the power supply controller 3. After the above series of operations.

This data transmission device becomes ready for data communication.

Here, the NCU 1, the modem 2, and the power supply controller 3 are constantly supplied with a power supply 6. When data communication ends,
The DTE 4 turns off the ER multiplier signal (e) in FIG. 2, and the power supply controller 3 detects that the ER multiplier signal is turned off.

Stop supplying power 5 to DTE4. Note that the power supply controller 3 issues an ER double signal line connection command CML during data communication.
is being monitored.

As explained above, according to the present invention, the power is automatically turned on to the data terminal device only when data communication is performed, and the power is automatically turned off when the data communication is completed, thereby configuring a data transmission device with low power consumption. can.

[Brief explanation of drawings]

FIG. 1 shows a data transmission device according to an embodiment of the present invention;
The figure is a timing diagram of each part of FIG. 1. 1: Network control unit (NCU), 2: Modulation/demodulation unit (modem)
, 3: Power supply controller, 4: Data terminal equipment (DTE),
5, 6: Power line.

Claims (1)

[Claims] A data communication device comprising a data terminal device, a modem device, a network control device, and a power supply controller. When the data communication device receives a call from the partner station, the network control device outputs a first paging signal to the power supply control device, the power supply control device returns the first paging signal to the modem, and outputs the first paging signal to the modem. When the modem detects the first paging signal, it outputs a second paging signal to the data terminal device and the power supply control device, and the power supply device detects the first paging signal. Second
When the second calling signal is confirmed, the power of the data terminal device is turned on, and the powered-on data terminal device detects the second calling signal and sends a ready signal indicating completion of preparation for transmission/reception to the modulation/demodulation device and the second calling signal. A data communication device characterized in that data communication is performed by outputting data to a power supply control device, and when the data communication is completed, the data terminal device turns off a ready signal and stops power supply from the power supply device. power control method.