JPH0648837B2 - Data terminal equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is applicable to telephone lines and PBXs (private branch exchanging).
e) The present invention relates to a data terminal device which is connected to an extension and performs data communication.

[Prior Art] A conventional device of this type is shown in FIG. FIG. 3 is a block diagram showing the configuration of a conventional data terminal device. In FIG. 3, (1) shows an incoming signal (C) from a telephone line.
Incoming signal detection circuit for detecting I signal), (2) Photocoupler for insulation isolation from telephone line, (3) Transformer for electrically separating DC from telephone line, (4) Modem / control The circuit performs mutual conversion between analog signals and digital signals. (5) is a resistor for pulling up the signal, (6) is a main control unit, (7) is a power supply device, and (10a) is the entire communication processing unit.

The communication processing unit (10a) modulates the digital signal from the main control unit (6) into an analog signal by the modem / control circuit (4) and sends it to the telephone line, and also outputs the modulated analog signal from the telephone line. The modem / control circuit (4) demodulates the data so that it can be processed by the main control unit (6) and controls data communication and outgoing / incoming calls to the telephone line.

Next, the operation of the device shown in FIG. 3 will be described. When there is an incoming call, that is, a call is made from the telephone line, the incoming call detection circuit (1) detects the CI signal which is the incoming call signal, and the C signal
The photo coupler (2) is driven by the I signal and the signal (2) is sent from the photo coupler (2). When the modem / control circuit (4) knows that there is an incoming call on the telephone line from this ▲ ▼ signal, and sends an answer tone to the other party of the call (hereinafter called the calling party) via the isolation transformer (3). At the same time, the main control unit (6) is notified that there is an incoming call. After sending this answer tone, the modem / control circuit
(4) waits for the carrier signal from the calling side to be sent, receives the carrier signal, then receives the data from the calling side, demodulates and converts this data, and the main control unit (6) Transfer to.

When data is transferred from the main control unit (6) to the telephone line, that is, when this device is the calling side, the modem / control circuit (4) sets the telephone line according to the instruction from the main control unit (6). The call is sent to the other side, and the data is transferred after the answer tone from the other side, that is, the called side is detected.

[Problems to be Solved by the Invention] Since the conventional data terminal device as described above is configured as described above, the power supply device (7) is turned on and the main control unit is used for both outgoing and incoming calls. (6) and communication processing unit
It is necessary to supply power to both sides of (10a). Therefore, when it is not known when an incoming call from the other party will occur, there is a problem that the power switch of the entire device must be kept in the ON state to supply power.

The present invention has been made to solve such a problem, and an object of the present invention is to obtain a data terminal device capable of transmitting and receiving data even when the power switch of the entire device is in the OFF state.

[Means for Solving the Problems] A data terminal device according to the present invention distinguishes a power supply device that supplies power to the device into a standby power supply device, a communication unit power supply device, and a main power supply device, and an incoming signal from a telephone line or The power supply from the power supply unit of the communication unit is controlled through a relay driven by a command from the main control unit, and the content of the data is stored in the backup memory at the time of making and receiving a call.

[Operation] In the present invention, the power supply device for supplying power to the device is divided into a standby power supply device, a communication unit power supply device, and a main power supply device, and the relay is driven by an incoming signal from a telephone line or a command from the main control unit. Since the power supply from the communication unit power supply is controlled through and the content of the data is stored in the backup memory at the time of making and receiving calls, it is possible to drive with the minimum required power supply when making and receiving calls. In addition, unmanned driving and labor saving are possible.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a part of the configuration of a data terminal device according to the present invention. In the figure, the same reference numerals as those in FIG. 3 indicate the same or corresponding parts, and (10) is the communication processing part according to the present invention.

FIG. 2 is a block diagram showing the configuration of the power supply control unit used in the data terminal device. In the figure, (8) is a standby power supply device, (9) is a comparator, (11) is a relay coil, and (1)
2) is a relay contact, (13) is a main power supply switch, (14) is a main power supply device, (15) is a communication unit power supply device, and (20) is a power supply control unit as a whole.

The resistance (R3) and the resistance (R4) are the reference voltage Vr from the power supply Vcc1.
It is a resistor to obtain ef1, and similarly resistor (R5) and resistor (R
6) is a resistor for obtaining the reference voltage Vref2 from the power supply Vcc2, and the resistor (R7) is a resistor for pulling up the output of the comparator (9) with Vcc1.

1 and 2, the standby power supply (8) constantly supplies the power supply Vcc1 to the power supply control unit (20) and the resistor (16) that pulls up the ▲ ▼ signal, and the power supply for the communication unit. apparatus
Reference numeral (15) supplies a power supply Vcc2 to the communication processing unit (10) and is output when the relay contact (12) is connected to the side a by the relay coil (11). The main power supply unit (14) is for supplying power to the main unit (that is, the main control unit (6) and various peripheral devices omitted in FIG. 1).

Next, the operation of the apparatus shown in FIGS. 1 and 2 will be described. First, when there is an incoming data, the incoming call detection circuit
When the CI signal which is the call from the calling side is detected in (1), the incoming detection circuit (1) drives the photocoupler (2) and outputs the signal. On the other hand, since the power supply Vcc1 is constantly supplied to the resistor (16) from the standby power supply (8) and is pulled up, even if the main power switch (13) is OF
An electrical signal can be obtained even in the F state.
The ▲ ▼ signal from this photocoupler (2) is input to the base of the transistor (Tr1) shown in FIG. 2 through the resistor (R1), and the ▲ ▼ signal that informs that it has arrived is LOW.
(Hereinafter referred to as “L”), Vcc1 via resistor (R2)
Since the voltage of appears at the base of the transistor (Tr1) changes, the transistor (Tr1) is driven and turned on. When this transistor (Tr1) is turned on, current flows through the bases of the transistor (Tr2) and transistor (Tr3), and the transistor (Tr2) and transistor (Tr3)
And turn on together. When the transistor (Tr2) turns on, a current flows through the relay coil (11), the relay contact (12) switches from the b side to the a side, and the communication power supply unit (15) receives an external A
The power of C100V is input, and the communication power unit (15) is powered by Vc.
Output c2. The output power Vcc2 is the communication processing unit (10).
The communication processing unit (10) starts its operation. This communication processing unit (10) is substantially the same as the conventional communication processing unit (10a) except that the incoming signal detection circuit is removed and a backup memory (not shown) is added. Immediately after starting the operation of the communication processing unit (10), the power control unit (2
The POWER CONT signal, which is the control signal for 0), is set to "L". By setting this POWER CONT signal to "L", the base of the transistor (Tr4) will be near the ground potential,
The transistor (Tr4) turns off.

Here, when the power supply Vcc2 is not output, there is no bias voltage at the base of the transistor (Tr4),
The potential (Vref2) at the + side terminal of the comparator (9) is close to the ground potential via the resistor (R6), while Vcc1 is always output at the-side terminal of the comparator (9). , The potential (Vref1) determined by the resistance values of the resistors (R3) and (R4) is input, and the output of the comparator (9) is "L" because Vref1> Vref2. Transistor (Tr5) because the output of (9) is "L"
Is off.

When Vcc2 is output by the ▲ ▼ signal and the transistor (Tr3) is turned on, Vref1 <Vref2 is established, and the potential of each is inverted, and the output of the comparator (9) becomes "H". ) Turns on,
It will drive the relay coil (11). This relay coil (11) has already been driven by the transistor (Tr2), but when the transistor (Tr5) is turned on, it will be held by itself even if the ▲ ▼ signal disappears, and data will be received. Is possible. The received data is stored in the backup memory in the communication processing unit (10).

When all reception processing is completed, the communication processing unit (10)
The R CONT signal is "H", and this POWER CONT signal is "H"
Then the CI signal becomes the same as it was before the call arrived, and Vr
The condition of ef1> Vref2 is satisfied, and the transistor (Tr5) is OF
F When this transistor (Tr5) is turned off, the current flowing through the relay coil (11) is stopped, the relay contact (12) is switched from a side to b side, and the communication unit power supply device
The power supply of AC100V which is the input power source to (15) is stopped, and all the operations are restored to the state before the CI signal was received.

Next, the operation at the time of calling will be described. Data to be transmitted and command data necessary for transmission are
After the data is stored in the backup memory in the communication processing unit (10) from (6), even if the operator turns on the main power switch (13),
Data can be automatically transferred even if FF is performed.
That is, the communication processing unit (10), according to the command data stored in the memory received from the main control unit (6), until all of the data to be communicated is transferred to the intended partner,
The POWER CONT signal is set to "L", and the POWER CONT signal is set to "H" only after all data communication is completed.
When this POWER CONT signal becomes "H", the transistor (Tr4) is turned on as when the CI signal is received, and Vref1
> Vref2, the output of the comparator (9) becomes “L”, the transistor (Tr5) is turned off, the current flowing through the relay coil (11) is cut, and the relay contact (12) returns to the b side.

If both Vcc1 and Vcc2 are output, the CI signal is "H", and the POWER CONT signal is "L", Vref1 <Vre
The ratio of the resistance (R5) to the resistance (R6) and the resistance (R
By setting the ratio of 3) and resistance (R4), the PO
It is possible to control the relay coil (11) only with the WER CONT signal.

Although the power input to the relay contact (12) is AC100V, a relay contact may be provided at the output Vcc2 of the communication section power supply (15) to directly control the output system.
Not only the input power source of (15) but also the relay contact provided at the input part of the main power supply device (14) at the same time has the same effect as the above embodiment.

[Effects of the Invention] As described above, according to the present invention, even if the power switch of the entire apparatus is turned off, when an incoming call is received on the telephone line, the power is automatically supplied to a necessary place for a necessary time. Can be supplied to receive data, and data can be automatically transmitted even after the predetermined operation is completed, even if the power switch of the entire device is turned off. , Labor saving can be achieved, and it can be operated with the minimum necessary power supply.

This makes it possible to perform unmanned operation when receiving, and when calling, when the other party is talking, or when transferring the same content data to several places, that is, when performing the same data communication, perform a predetermined operation. After the completion of the operation, the call can be transmitted by unmanned operation, which has the effect of relieving the troublesome operation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a part of the configuration of an apparatus according to the present invention, FIG. 2 is a block diagram showing the configuration of a power supply control unit, and FIG. 3 is a configuration of a conventional apparatus. Block Diagram. (1) is an incoming call detection circuit, (2) is a photocoupler, (3) is a transformer, (6) is a main control section, (10) is a communication processing section, (8) is a standby power supply unit, and (14) is a main Power supply, (20) is the power control unit. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A telephone line or PBX (private branch exchan)
ge) In a data terminal device that performs data communication by connecting to an extension, an incoming call detection circuit that detects an incoming call on the telephone line, a standby power supply device for supplying power to this incoming call detection circuit, and during data communication A communication processing unit having a backup memory for storing the data, a communication unit power supply device that supplies power to the communication processing unit, a main control unit that controls the entire device, and a main power switch that supplies power to the main control unit. A power supply unit for controlling power supply from the communication unit power supply unit, driving the power supply control unit by an incoming signal from the incoming call detection circuit to supply power from the communication unit power supply unit to the communication processing unit Means for storing the transferred data in the backup memory by supplying power to the backup memory when the main power switch is turned on Means for transferring the stored data to the main control unit, means for storing data to be transferred from the main control unit and a command necessary for transmitting this data in the backup memory, and the communication processing unit for the command And a means for driving the power supply control unit to stop the power supply from the communication unit power supply device when the data is transmitted in accordance with the above.