JP2016036117A - Communication apparatus, control method of the same, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to determine that the state of connection with a telephone line changes from connection to un-connection during a sleep mode and that the state changes from un-connection to connection because the telephone line is connected during the sleep mode.SOLUTION: In a communication apparatus and a control method of the same, when variation in line voltage is detected during a sleep mode, the apparatus is restored to a stand-by mode and the state of connection with the line is detected. When the state of the connection with the line is changed from un-connection to connection, measuring a period to shift to a power off mode is stopped and the apparatus is shifted to a sleep mode. When the detected state of the connection is changed from connection to un-connection, measuring the period to shift to the power off mode is started and the apparatus is shifted to a sleep mode.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a communication apparatus, a control method therefor, and a program.

  In recent years, communication devices have been required to reduce power consumption more and more. For this purpose, not only simply reducing standby power, but also not connecting to network lines, telephone lines, etc., and if the communication device is not used for a certain period of time The necessity of management is also considered. In fact, the environmental directive (Lot26) in Europe is scheduled to be regulated in the near future, considering that it is essential to conduct such power management. According to this Lot 26, when all the wireless network ports are stopped at this time and the connection with all the wired network ports is disconnected (a state where the device is not physically and logically connected to any network) Has a power consumption of 0.5W. That is, since the wired network port includes a telephone line, if the telephone network is not connected and is not connected to the telephone line, it means that power management of 0.5 W or less is performed.

  From such a background, there has conventionally been an apparatus that detects whether or not a network or a telephone line is connected, and performs power management when it is not connected. For example, in order to achieve the power management of the target value 0.5 W defined by this Lot 26, it is considered to respond by turning off the power supply of the entire apparatus.

  Japanese Patent Application Laid-Open No. 2004-228867 further discloses that in a digital multi-function peripheral that performs power management when not connected to a telephone line, the power supplied to a circuit that detects a return factor when not connected to the telephone line is cut off. It describes the achievement of power saving.

JP 2006-254384 A

  FIG. 2 shows an example of power transition that can be considered when power management is performed to turn off the power of the digital multi-function peripheral in order to achieve power management with the target value of 0.5 W. FIG. 2 is a diagram for explaining an example of a time transition of power management according to a result of detecting a connection with a telephone line in a digital multi-function peripheral.

  It is detected whether the digital multi-function peripheral is connected to the telephone line in the standby mode in which it can be used, and it is detected that it is not connected to the telephone line at time t1. If the unused state continues for a certain time (t4-t1) without being connected to the telephone line, the digital multifunction peripheral is shifted to the power-off mode at time t4. At this time, from the viewpoint of energy saving, it can be considered to shift to the sleep mode at time t2. When the control method disclosed in Patent Document 1 is implemented in the sleep mode, power is not supplied to the print request detection unit from the facsimile reception detection unit or the network that monitors factors for returning from the sleep mode in the sleep mode. In this case, even when the communication line is reconnected to the public line at time t3 in the sleep mode, for example, the CPU of the digital multi-function peripheral cannot detect the connection. Therefore, although it is connected to the public line, it shifts to the power-off mode at time t4. This is the case, for example, when it is detected that it is not connected to the telephone line at time t1, and after entering the sleep mode at time t2, it is connected to the telephone line at time t3 between times t2 and t4. For example, the standby mode is several tens of watts, the sleep mode is several watts, and the power-off mode is a value of approximately 0 watts.

  In order to solve the above problem, for example, in the sleep mode, it is conceivable to energize a circuit that monitors the cause of return from the sleep mode, for example, a circuit that detects a print request from the network or a circuit that detects the arrival of a facsimile. . Specifically, power is supplied to a modem, SDAA, and the like that detect the incoming call of the facsimile apparatus. SDAA is an abbreviation for Silicon Data Access Arrangement, and is a network control unit (NCU) that is arranged between a telephone line and a modem and is made of a semiconductor. At that time, power is supplied to the CPU of the facsimile apparatus, but the operation of the CPU is stopped to reduce power consumption. As a result, the operation of the CPU is stopped, and it has not been possible to determine that the connection with the telephone line has changed from connected to unconnected during the sleep mode. Also, it was not possible to determine when the telephone line was connected during the sleep mode and the connection was changed from unconnected to connected.

  An object of the present invention is to solve the above-mentioned problems of the prior art.

  A feature of the present invention is to provide a technique for detecting a change in the connection state with a line during the sleep mode and controlling the transition to the power-off mode.

In order to achieve the above object, a communication apparatus according to an aspect of the present invention has the following arrangement. That is,
Detection means for detecting changes in the line voltage;
A time measuring means for measuring time;
Detecting means for detecting a connection state with the line;
A transition means for transitioning to the sleep mode when the transition condition to the sleep mode is satisfied;
When the detection means detects a change in the line voltage in the sleep mode, the detection means returns to the standby mode and the connection state with the line is detected by the detection means, and the connection state detected by the detection means is not connected. When the connection is changed, when the time to shift to the power-off mode by the timing unit is stopped and the mode is shifted to the sleep mode, and the connection state detected by the detection unit is changed from connected to unconnected Comprises control means for starting time measurement by the time measuring means to shift to the power-off mode and controlling to shift to the sleep mode.

  According to the present invention, it is possible to detect that the connection state with the line has changed during the sleep mode, and to control the transition to the power-off mode according to the state.

  Other features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings. In the accompanying drawings, the same or similar components are denoted by the same reference numerals.

The accompanying drawings are included in the specification, constitute a part thereof, show an embodiment of the present invention, and are used to explain the principle of the present invention together with the description.
1 is a block diagram illustrating a configuration of a facsimile apparatus according to Embodiment 1 of the present invention. The figure explaining an example of the time transition of the power management according to the result of having detected the connection with a telephone line in a digital multifunctional device. FIG. 3 is a diagram illustrating an example of a change in line voltage of a communication line when the facsimile apparatus according to the first embodiment captures the line. FIG. 3 is a simplified block diagram for explaining a direct current capture operation of the facsimile apparatus according to the first embodiment. FIG. 3 is a block diagram for explaining power supply in the facsimile apparatus according to the first embodiment. FIG. 5 is a diagram for explaining a transition of a power output state from a power circuit corresponding to the state of the facsimile apparatus according to the first embodiment. , 6 is a flowchart for explaining transition of an operation state in the facsimile apparatus according to the first embodiment. 9 is a flowchart for describing processing when the facsimile apparatus shifts to a sleep mode in S816 of FIG. FIG. 3 is a diagram illustrating an example of power transition in the facsimile apparatus according to the first embodiment. FIG. 5 is a diagram illustrating another example of power transition of the facsimile apparatus according to the first embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the present invention according to the claims, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the present invention. .

[Embodiment 1]
FIG. 1 is a block diagram illustrating a configuration of a facsimile machine 100 according to the first embodiment of the present invention. Here, the communication apparatus according to the present invention will be described by taking the facsimile apparatus according to the embodiment as an example. This communication apparatus is not limited to a facsimile apparatus, and may be an information processing apparatus such as a multifunction machine or a PC.

  A system-on-chip (SOC) 101 includes a CPU 200 and controls the operation of the facsimile apparatus 100 as a whole. The memory 140 is connected to the SOC 101 and functions as a main storage device and an auxiliary storage device that can be accessed by the CPU 200, and is used as a work memory for the CPU 200 and a memory for storing a control program. The memory 140 is also used as a memory for temporarily storing image data and various types of information during facsimile transmission or reception, and includes a non-volatile storage device that stores information set by the user. Also used to store. The SDAA program 202 is a program executed by the DSP 205 of the modem 102, transferred to the modem 102, expanded in the RAM 204, and then executed by the DSP 205. As the memory 140, a RAM, a hard disk, or a flash memory can be used.

  An operation panel 118, a reading unit 121, a recording unit 122, and an IF unit 123 are connected to the SOC 101. The operation panel 118 includes a display 119 and a keyboard 120, which function as a user interface. A display 119 displays the state of the apparatus and menus. The keyboard 120 includes buttons and numeric keys for receiving input of various instructions from the user, and the user can input user setting information using the keyboard. The reading unit 121 reads an image of a document and generates image data. The generated image data may be facsimile-transmitted to the counterpart device via the communication line 130 and the public line 210, or may be printed by the recording unit 122. The IF unit 123 functions as an interface for connecting various information devices. The IF unit 123 includes, for example, a network IF 127 and is connected to a LAN (Local Area Network) 240. The connection confirmation with the network IF 127 is determined by checking the state of the transmission path and the connection destination in the data link layer of the basic protocol of the network and determining whether data can be transmitted and received. Here, the network IF 127 functions as a LAN controller, and performs data transmission / reception with an external gateway, for example, by a CSMA / CD (Carrier Sense Multiple Access / Collision Detection) communication method.

  The modem 102 includes a ROM 203, a RAM 204, a DSP 205, and a register 206, and is a modem that operates based on the control of the SOC 101. The modem 102 performs modulation processing using the image data read by the reading unit 121 that is a target of facsimile transmission, and demodulation processing of signals received via the communication line 130 and the public line 210. The modem 102 is connected to the SDAA (ie, silicon data access arrangement) 104 through the isolation element 103. The ROM 203 stores a program executed by the DSP 205. The RAM 204 expands the SDAA program 202 transferred from the host and the program stored in the ROM 203, and the DSP 205 executes the expanded program. The DSP 205 executes the program expanded in the RAM 204 and controls the operation of the modem 102. The register 206 stores the state of the SDAA 104 or stores an instruction from the SOC 101.

  The SDAA 104 is a semiconductor NCU (network control unit) that is an example of a circuit that performs network control, and includes a line capture circuit 105, a voltage detection circuit 150, a current detection circuit 151, and an AC filter circuit 201. The SDAA 104 is a network control unit that is connected to the communication line 130 and functions as an interface between the image forming apparatus 100 and the external communication line 130. Also, the SDAA 104 controls the connection (capture) state of the line when communicating with the counterpart device via the communication line 130. A telephone 128 externally attached to the image forming apparatus 100 is also connected to the communication line 130. The telephone 128 is connected to the communication line 130 via the H relay 110, and the SDAA 104 is connected to the communication line 130 in parallel with the telephone 128 when waiting for a ringing incoming call. The SDAA 104 not only captures the line and controls the communication when performing facsimile transmission / reception, but also when the telephone 128 performs voice communication with the other apparatus via the communication line 130. Control the capture state. The SDAA 104 executes these controls based on the control of the SOC 101.

  The SDAA 104 uses the line acquisition circuit 105 to control the DC acquisition state of the line. The direct current impedance when the direct current is captured by the line capture circuit 105 is variable. This impedance is obtained by a preset current characteristic with respect to a DC voltage (hereinafter referred to as DC-VI characteristic). The voltage detection circuit 150 is a circuit that monitors the voltage of the communication line 130. The current detection circuit 151 is a circuit that monitors the current on the communication line 130. The AC filter circuit 201 is connected to the preceding stage of the voltage detection circuit 150 or the current detection circuit 151, and plays a role of preventing erroneous detection by removing the AC component when detecting a DC voltage or current.

  The DC capture circuit 152 is a peripheral circuit of the SDAA 104, and adjusts the DC impedance under the control of the SDAA 104 while performing DC capture by adjusting the current of the current source. The DC capturing circuit 152 is also used when creating a line open state or sending a dial pulse which is a kind of selection signal for the line. The rectifier circuit 155 includes a diode bridge or the like, and rectifies a signal from the communication line 130 and transmits it to the SDAA 104. The reception IF circuit 153 is an interface circuit for receiving a facsimile reception signal received via the communication line 130. For example, in the case of Japan, the AC impedance matching circuit 154 is a circuit for matching the AC impedance to 600Ω. The noise removal circuit 156 suppresses lightning surge, electromagnetic noise, and the like from the communication line 130, and conversely prevents noise from the image forming apparatus 100 from being sent via the communication line 130.

  Since the facsimile apparatus according to the first embodiment does not include the CI detection circuit, the call signal (CI signal) received from the communication line 130 is input to the SDAA 104 via the line voltage input circuit 157, and the voltage detection circuit 150 in the SDAA 104 is input. Detect with. The modem 102 detects a CI signal using the line voltage value. The Japanese PSTN switch sends AC75Vrms superimposed on about 48V DC to the facsimile machine 100 as a CI signal. Thus, it is determined whether the CI scene is received by the modem 102 using the line voltage value detected by the voltage detection circuit 150 in the SDAA 104.

  The H relay 110 switches between a connection state in which the external telephone 128 is connected to the communication line 130 and a state in which the external telephone 128 is disconnected from the communication line 130. The H relay 110 is controlled by the SOC 101 using the H relay drive signal 111. When the telephone 128 is disconnected from the communication line 130 by the H relay 110, the telephone 128 does not ring even when a CI signal is received. The facsimile apparatus shown in FIG. 1 does not include a hook detection circuit using a photocoupler or the like. When about 48V DC fed from the communication line 130 is used for the hook detection voltage and the external telephone 128 is off-hooked and DC is captured, the line voltage drops due to the line resistance and changes from 48V to about 8V. When the external telephone 128 is on-hooked and the line is released, the line voltage returns to 48V. The line voltage is input to the SDAA 104 via the line voltage input circuit 157, and the modem 102 detects whether the external telephone 128 is on-hook or off-hook using the line voltage value detected by the voltage detection circuit 150 of the SDAA 104. To do. An off-hook or on-hook detection result of the external telephone 128 detected in this way is transmitted from the modem 102 to the SOC 101. Of course, the hook detection DC voltage transmission circuit or the pseudo CI transmission circuit may be connected from one side of the H relay 110 to provide a hook detection circuit.

  210 is a PSTN (public line), and 220 is a counterpart facsimile machine connected via the public line 210. The timer circuit 124 is connected to the SOC 101, and when the time set from the SOC 101 is measured, the timer circuit 124 notifies the CPU 200 by an interrupt or the like. The SOC 101 controls activation setting and timer clearing of the timer circuit 124. The power supply circuit 125 is a circuit that generates power to be supplied to a circuit block inside the facsimile apparatus 100. In Japan, AC 100 V is supplied from the commercial power source 250, and for example, a plurality of power source outputs 165 and 166 are generated. The power output 165 and 166 are controlled by a power output control signal 164 supplied from the power controller 207 in the SOC 101 to the power circuit 125.

  Further, interrupt signals (d1, d2, d3, d4) generated from the modem 102, the network IF 127, the timer circuit 124, and the keyboards 120 are supplied to the power control unit 207. As a result, when any one of these interrupt signals is input, the power supply control unit 207 notifies the CPU 200 that a factor for returning from the sleep mode has occurred. In response to the occurrence of the return factor, the CPU 200 returns from the stopped state where the operation is stopped and resumes the execution of the program. Then, the CPU 200 controls the power supply control unit 207 and causes the power supply output 166 of the power supply circuit 125 to be output by the power supply output control signal 164. After the CPU 200 returns from the stopped state in this way, the power supply control unit 207 is accessed, and when it is determined from which circuit the return factor is, the interrupt factor is cleared.

  The interrupt signal d1 is an interrupt signal output when the modem 102 detects a change in line voltage. The interrupt signal d2 is an interrupt signal generated when the network IF 127 detects a print job addressed to the facsimile apparatus 100. The interrupt signal d3 is an interrupt signal output when the timer circuit 124 has passed a predetermined time. The interrupt signal d4 is an interrupt signal indicating that the keyboard of the keyboard 120 has been pressed. Alternatively, some or all of the interrupt signals d1, d2, d3, and d4 may be supplied to the power supply control unit 207 of the SOC 101 as an interrupt signal d obtained by ORing all the signals. In this case, after the CPU 200 returns from the stopped state by the interrupt signal d, it is determined whether the modem 102, the network IF 127, the timer circuit 124, or the keyboard 120 generates the interrupt signal.

  FIG. 3 is a diagram illustrating a change example of the line voltage of the communication line 130 when the facsimile apparatus 100 according to the first embodiment captures the line.

  The line voltage for DC capture when the communication line 130 is connected to the public line 210 and the line voltage when the communication line 130 is not connected to the public line 210 have the relationship described below.

  First, in FIG. 3, at 301, the DC capturing circuit 152 is not in the DC capturing state (on-hook), and the voltage value at this time is about 48V. At this time, the DC resistance value viewed from the public line 210 is 1 M ohm or more. In 302, an off-hook operation is started, and the DC capture circuit 152 adjusts the DC impedance by controlling the SDAA 104 while performing DC capture by adjusting the current. At this time, due to the voltage drop caused by the line resistance of the public line 210, the line voltage gradually begins to drop as the line current increases. Reference numeral 303 denotes a state where the adjustment of the DC impedance is completed and the DC resistance value viewed from the public line 210 becomes a constant value. In this state 303, the line voltage value viewed from the facsimile machine 100 is lowered due to the voltage drop of the line resistance. For example, when the DC impedance is about 266Ω and the line current flows 30 mA, a voltage drop of 30 [mA] × 1333 [Ω] ≈40 [V] occurs if the line resistance and the internal resistance of the switch are about 1333Ω. . Here, when the public line 210 is controlled at a constant voltage, a voltage drop from about 48V to about 40V occurs, and the line voltage viewed from the facsimile apparatus 100 becomes about 8V. The same applies when the SDAA 104 does not capture the line and the external telephone 128 goes off-hook.

  FIG. 4 is a simplified block diagram for explaining the DC capturing operation of the facsimile apparatus 100 according to the first embodiment. Description of the rectifier circuit 155 and the like not described is omitted.

  A DC voltage of about 48 V is supplied to the facsimile apparatus 100 from the exchange on the public line 210. A DC voltage of 48V is supplied to the DC capturing circuit 152 connected to the communication line 130 via the internal resistance Z0 (4003) and the line resistances Z1 and Z2 (4004 and 4005) of the local exchange. The DC capture circuit 152 includes a circuit such as a transistor or a resistor that can change the internal DC impedance, and adjusts the current value I supplied from the public line 210 under the control of the SDAA 104. When the DC impedance Z (Z is expressed by V / I) of the DC capture circuit 152 is increased by controlling the SDAA 104, the line current decreases, and when the DC impedance Z is decreased, the line current increases.

  The SDAA 104 monitors the voltage and current between the terminals of the DC capture circuit 152 and adapts the DC impedance Z of the DC capture circuit 152 so as to conform to the specified DC voltage V and current I characteristics (DC-VI characteristics). Can be adjusted. The exchange on the public line 210 has a voltage source or a current source. The local exchange controls the internal resistance Z0 (4003) to constitute a current source.

  When the direct current capture of the facsimile apparatus 100 is started, the line-to-line voltage between the L1 and L2 of the facsimile apparatus 100 drops significantly due to the line resistances Z1 and Z2 (4004, 4005) (several hundred to several kiloΩ). On the assumption that the voltage drops in this way, the direct current impedance Z is controlled so as to satisfy the prescribed DC-VI characteristics. For example, it is assumed that the line-to-line voltage between L1 and L2 of the facsimile apparatus 100 decreases to about 8V due to a voltage drop after DC capture even if it is DC 48V before DC capture. At this time, for example, even if the DC impedance Z including the DC capturing circuit 152 of the facsimile apparatus 100 is 1 MΩ or more before DC capturing, the SDAA 104 controls to decrease from several tens of Ω to several hundred Ω after DC capturing.

  Next, a method for determining whether the facsimile apparatus 100 is connected to the public line 210 via the communication line 130 or not connected will be described.

  When the communication line 130 and the public line 210 are not connected, the communication line 130 is disconnected from the public line 210, so that 48V is not supplied from the public line 210. As a result, the line voltage of the communication line 130 becomes approximately 0V. On the other hand, when the communication line 130 and the public line 210 are connected and DC capture is performed by the SDAA 104, the line voltage drops as described above, but does not become 0V but is maintained at a predetermined constant voltage. . Therefore, for example, the set value A1 of the threshold voltage 304 in FIG. 3 is set to about 3V. When the SDAA 104 is not capturing DC, if the line voltage is less than the threshold voltage (3 V), it can be determined that the communication line 130 is not connected to the public line 210.

  Even when the communication line 130 is connected to the public line 210 and the SDAA 104 is not capturing DC, the line voltage drops and is held at a predetermined constant voltage when the external telephone 128 is off-hook. Therefore, for example, when the set value A1 of the threshold voltage 304 is set to about 3 V, the set value A2 of the different threshold voltage 305 is set to about 20 V, and the external telephone is set when the threshold voltage A1 is equal to or higher than the threshold voltage A2 It can be determined that 128 has acquired the line.

  Further, by monitoring the line voltage, line voltage detection for determining whether the communication line 130 is connected to the public line 210 or not can be performed by the voltage detection circuit 150 of the SDAA 104. That is, the setting values A1 and A2 of the threshold voltage 304 are held in the register 206 of the modem 102 in advance. In the SDAA 104, the line voltage detected by the voltage detection circuit 150 is compared with this threshold voltage value. If the threshold voltage value is less than the set value A1, the communication line 130 is not connected to the public line 210. The indicated flag is held in the register 206. If the threshold voltage setting value A1 is not less than A2 and not more than A2, a flag indicating that the external telephone 128 connected to the communication line 130 is capturing the line is held in the register 206. Therefore, the CPU 200 refers to this flag so that the communication line 130 and the public line 210 are connected, or the external telephone 218 is capturing the line, or the communication line 130 and the public line 210 are not connected. Can be determined. The operation of the facsimile machine 100 can be controlled according to the situation.

  FIG. 5 is a block diagram illustrating power supply in the facsimile apparatus 100 according to the first embodiment.

  The power supply circuit 125 is supplied with commercial power AC100V via the outlet 250, and the power supply circuit 125 generates a plurality of power supply voltages based on the AC100V and supplies them to the circuit block inside the facsimile apparatus 100. The power output 165 generated by the power circuit 125 is supplied to the first power system circuit 5001. The power output 166 generated by the power circuit 125 is supplied to the second power system circuit 5002. Here, the first power supply system circuit 5001 is a circuit that needs to continue to supply power even in the sleep mode. This includes the modem 102, timer circuit 124, network IF 127, keyboards 120, memory 140, and SOC 101 shown in FIG. The SDAA 104 is supplied with power from the modem 102 via the insulating element 103. In the sleep mode, the facsimile apparatus 100 supplies power to the modem 102 and the SDAA 104, but shifts the modem 102 to a low power consumption mode in which only minimal processing can be performed. At this time, the frequency of the operating clock of the modem 102 is lowered, or the power supply to the non-operating part inside the modem 102 is cut off. In order to reduce the power consumption of the H relay 110, the H relay drive signal 111 is controlled to shift to a ringing incoming state where the external telephone 128 and the communication line 130 are connected. If a hook detection DC voltage transmission circuit or a pseudo CI transmission circuit is connected from one side of the H relay 110 and the hook detection circuit is provided, an off-hook at the external telephone 128 is maintained in the state of no ringing incoming call. May be detected by the hook detection circuit.

  When a call signal (CI signal) is received from the communication line 130 in the sleep mode, the CI signal received from the communication line 130 is input to the SDAA 104 via the line voltage input circuit 157, and the voltage detection circuit 150 of the SDAA 104 Detect. As described above, in the sleep mode, the modem 102 shifts to the low power consumption mode in which only minimal processing can be performed. Therefore, the modem 102 cannot determine the arrival of the CI signal using the line voltage. Therefore, when the voltage detection circuit 150 detects that the voltage has changed and detects the CI signal, the interrupt signal d1 is supplied to the SOC 101 to return from the sleep mode to the standby mode.

  When the time set in the timer circuit 124 elapses, the timer circuit 124 supplies an interrupt signal d3 to the SOC 101 to notify the timing for shifting to a predetermined operation mode. When notifying the timing at which the standby mode can be shifted to the sleep mode, the timer value 124 is set in the timer circuit 124 and the timer circuit 124 is started. When notifying the timing at which the communication line 130 is not connected to the public line 210 and notifying the timing at which the communication line 130 can shift to the power-off mode, the timer circuit 124 is started by setting the timer value M2 in the timer circuit 124.

  When the network IF 127 receives a print job addressed to the facsimile apparatus 100 via the LAN 240 in the sleep mode, the network IF 127 supplies an interrupt signal d2 to the SOC 101 to return from the sleep mode to the standby mode.

  When the keyboard 120 receives input of various instructions from the user, the keyboard 120 supplies an interrupt signal d4 to the SOC 101 to return from the sleep mode to the standby mode.

  Thus, the first power supply system circuit 5001 is a circuit that generates a return factor in the sleep mode, and is a circuit to which power is supplied even in the sleep mode.

  On the other hand, the second power supply system circuit 5002 indicates a circuit other than the first power supply system circuit 5001, and power supply is stopped in the sleep mode. For example, since the reading unit 121 and the recording unit 122 of the facsimile apparatus 100 are included in the second power supply system circuit 5002, the power supply is stopped in the sleep mode.

  When the facsimile apparatus 100 according to the first embodiment is shifted from the standby mode to the sleep mode, the SOC 101 supplies the power output control signal 164 to the power circuit 125 and stops the output of the power output 166 output from the power circuit 125. . As a result, the power supply to the second power supply system circuit 5002 of the facsimile apparatus 100 is stopped, and the mode shifts to the sleep mode.

  When the facsimile apparatus 100 is shifted from the standby mode to the power-off mode, the SOC 101 belonging to the first power system circuit 5001 supplies the power output control signal 164 to the power circuit 125. As a result, the power outputs 165 and 166 from the power circuit 125 are stopped, and the mode is shifted to the power off mode. When the facsimile apparatus 100 is shifted from the sleep mode to the power-off mode, the SOC 101 supplies the power output control signal 164 to the power circuit 125 and stops the power output 165 from the power circuit 125. At this time, since the power output 166 is already stopped, the facsimile apparatus 100 shifts to the power-off mode.

  FIG. 6 is a diagram for explaining the transition of the state of the power output from the power circuit 125 corresponding to the state of the facsimile apparatus 100 according to the first embodiment. FIG. 6 shows a power output state from the power circuit 125 corresponding to the operation mode of the facsimile machine 100.

  In the standby mode, the power outputs 165 and 166 are both on, and in the sleep mode, only the power output 165 to the first power system circuit 5001 is on. In the power-off mode, the power outputs 165 and 166 are both off. In order to shift from the power-off mode to the standby mode, the operator needs to turn on the power switch of the facsimile machine 100 again.

  7 and 8 are flowcharts for explaining the transition of the operation state in the facsimile apparatus 100 according to the first embodiment. A program for executing this process is stored in the memory 140, and the CPU 200 executes the program to achieve the process shown in this flowchart. This process is started when the power of the facsimile apparatus 100 is turned on, and the CPU 200 resets and initializes the modem 102 and the SDAA 104 according to settings developed from the program and the nonvolatile memory in the memory 140. If the modem 102 or SDAA 104 is reset here, the register 206 of the modem 102 returns to the default value.

  First, in step S <b> 701, the CPU 200 detects whether the communication line 130 is connected to the public line 210 in a state where the SDAA 104 is not capturing DC, and stores the result in the flag of the register 206 of the modem 102 and the memory 140. To do.

  In step S <b> 702, the CPU 200 determines whether the communication line 130 is connected to the public line 210. If it is determined that the communication line 130 and the public line 210 are not connected, the process advances to step S703, and the CPU 200 sets the timer value M2 in the timer circuit 124 and advances to step S705. Here, the timer value M2 is set in order to measure the time during which the communication line 130 is not connected to the public line 210 and shift to the power-off mode. That is, until the timer value M2 elapses, the state in which the communication line 130 and the public line 210 are not connected continues, and when the time when the facsimile apparatus 100 does not operate continues, the facsimile apparatus 100 shifts to the power-off mode. To do.

  On the other hand, if it is determined in S702 that the communication line 130 and the public line 210 are connected, the process proceeds to S704 and the timer value M2 set in the timer circuit 124 is cleared. This is because, when connected to the public line 210, the power-off mode is not shifted even if the facsimile apparatus 100 does not operate. This clear process is executed even when the timer value M2 is set in the timer circuit 124 and the timer circuit 124 is not counting the time.

  In step S705, the CPU 200 shifts to a standby mode, and performs standby processing for various jobs. It monitors the operation by the user via the operation panel 118, the reception of a job from the network I / F 127, the incoming call from the public line 210, and the off-hook of the external telephone 128. The timer circuit 124 and the memory 140 are also used to monitor the time during which no job is input. For example, the timer circuit 124 is accessed in a state where the job has not been submitted, and the measured time is acquired and stored in the memory 140. Then, in a state where there is no job, the timer circuit 124 can be accessed again after a certain time, and the elapsed time can be acquired.

  Next, proceeding to S706, the CPU 200 accesses the timer circuit 124, and determines whether or not the timer value M1 for shifting to the sleep mode has been started. This timer value M1 is a timer value for measuring the time during which no job continues. Alternatively, the CPU 200 stores the activation state of the timer value M1 in the memory 140 after accessing the timer circuit 124, and determines that there is no change in the operation of the timer circuit 124 until an interrupt from the timer circuit 124 is received. May be. The facsimile apparatus 100 starts measuring the timer value M1 when there is no user operation, input of various jobs, incoming call from the public line 210, or off-hook of the external telephone 128 for a predetermined time. If it is determined in S706 that the timer value M1 has been started, the process proceeds to S707, but if the timer value M1 has not been started, the process proceeds to S709. In step S709, the CPU 200 determines whether the no-job state continues. If the no-job state continues, the process proceeds to step S710, and the timer circuit 124 starts measuring the timer value M1, and then proceeds to step S801 (FIG. 8). . On the other hand, if it is determined in S709 that the user has entered the facsimile apparatus 100, input of various jobs, incoming call from the public line 210, off-hook of the external telephone 128, etc., the process proceeds to S801.

  If the CPU 200 determines in step S707 that the no-job state continues, the process advances to step S801. On the other hand, if the CPU 200 determines in step S707 that the job is present due to user operation on the facsimile apparatus 100, input of various jobs, incoming call from the public line 210, or off-hook of the external telephone 128, the process proceeds to step S708. Proceed. In S708, the CPU 200 stops and clears the timer value M1 by the timer circuit 124. In step S801, processing corresponding to user operations and reception of various jobs is performed. In addition, the process for determining whether the incoming call is from the public line 210 or the external telephone 128 is off-hook is performed in S807 described later.

  Next, the flowchart of FIG. 8 will be described.

  In step S <b> 801, the CPU 200 determines whether there is a change in the line voltage of the communication line 130. If there is a change in the line voltage, the interrupt signal d1 is input from the modem 102 to the SOC 101, so it can be determined whether or not there is a change in the line voltage by the interrupt signal d1. If there is no change in the line voltage, the process proceeds to S814. If there is a change in the line voltage, the process proceeds to S802. In step S <b> 802, the CPU 200 accesses the modem 102 and detects the connection state between the communication line 130 and the public line 210. At this time, the modem 102 can be accessed to obtain a line voltage value other than a flag indicating that the communication line 130 and the public line 210 are not connected or the external telephone 128 is off-hooked.

  Next, proceeding to S803, the CPU 200 determines whether or not the communication line 130 has changed from being connected to the public line 210 to being not connected. This can be determined by accessing the memory line 140 and comparing it with the current connection state since the communication line 130 has previously been connected to the public line 210 or not in the memory 140. If it is determined in S803 that the state is changed from the state connected to the public line 210 to the unconnected state, the process proceeds to S804, and if not, the process proceeds to S805. In S804, the CPU 200 sets the timer value M2 in the timer circuit 124 and starts measuring time. This is because the time when the communication line 130 is not connected to the public line 210 is counted so that the mode can be shifted to the power-off mode. At this time, the memory 140 holds that the communication line 130 is not connected to the public line 210. Then, the process proceeds to S705 (FIG. 7).

  In step S <b> 805, the CPU 200 determines whether the communication line 130 has changed from an unconnected state to the public line 210 to a connected state. If so, the process proceeds to S806, and if not, the process proceeds to S807. In S806, the CPU 200 clears the timer value M2 set in the timer circuit 124. This is because the communication line 130 and the public line 210 are connected, so that it is not necessary to shift to the power-off mode. At this time, the memory 140 holds that the communication line 130 and the public line 210 are connected. Then, the process proceeds to S705 (FIG. 7).

  In S807, since the connection state of the communication line 130 with the public line 210 has not changed, the CPU 200 controls the modem 102 so that the voltage change of the communication line 130 is caused by the arrival of the CI signal or the off-hook of the external telephone 128. Determine whether. If the voltage change of the communication line 130 is due to the arrival of a CI signal, the modem 102 sets a CI signal detection flag. Alternatively, when the SDAA 104 is not capturing DC, but the voltage of the communication line 130 is not less than the threshold voltage setting value A1 and not more than A2, a flag indicating that the external telephone 128 is capturing the line is displayed on the modem 102. Set in the register 206. It is also possible to access the modem 102 to acquire the line voltage value and use it for the determination.

  In step S808, the CPU 200 determines whether a CI signal is detected. In S807, if the CI signal detection flag is set in the modem 102, it means that the CI signal is received, the process proceeds to S811, and the CPU 200 performs facsimile reception processing. Since this process is a normal process, its detailed description is omitted. When the reception process ends, the process of the CPU 200 proceeds to S705.

  On the other hand, when the CI signal is not received in S808, the process proceeds to S809 and the CPU 200 determines whether or not the off-hook of the external telephone 128 is detected. If it is determined in step S807 that the off-hook detection flag is set in the modem 102, the process proceeds to step S812 because the external telephone 128 is off-hook. It is also possible to access the modem 102 to acquire the line voltage value and use it for off-hook determination. In step S812, the CPU 200 performs call processing using the facsimile external telephone 128. Since this is a normal process, its details are omitted. When the call process ends, the process of the CPU 200 advances to S705. If the CPU 200 determines in step S809 that the external telephone 128 is not off-hook, the process advances to step S810. S810 is a case where it is determined that none of the above S803, S805, S808, and S809 is applicable. At this time, the CPU 200 determines that the voltage change of the communication line 130 is noise and that the state of the communication line 130 does not change, continues the timer value M2 by the timer circuit 124, shifts to the standby mode, and proceeds to S705. .

  In S814, the CPU 200 determines whether the timer values M1 and M2 have been timed. Here, the CPU 200 may determine by accessing the timer circuit 128, or may determine by accessing the timer circuit 128 when the interrupt signal d3 from the timer circuit 124 is input to the SOC 101. Further, as will be described later in S815, whether or not the timer value M1 has been measured may be stored in the memory 140 and determined based on the result of accessing the memory 140. If it is determined that the timers M1 and M2 have been timed, the process proceeds to S817. The process of S817 is executed when it is determined that the facsimile apparatus 100 has not been operated for a certain period of time, no job is input, and the communication line 1300 and the public line 210 are not connected. Therefore, in step S817, the CPU 200 performs various end processes, changes the power output control signal 164 connected to the power circuit 125, stops the power outputs 165 and 166 from the power circuit 125, and shifts to the power off mode. Let When the power is turned off in this way, the CPU 200 is reset, so the operation is stopped and this process is terminated. Thereafter, it does not return until the power switch of the facsimile apparatus 100 is turned on manually.

  On the other hand, if the timer values M1 and M2 have not been timed in S814, the process proceeds to S815, and the CPU 200 determines whether the timer value M1 has been timed. At this time, the CPU 200 may determine by accessing the timer circuit 128, or may determine by accessing the timer circuit 128 when the interrupt signal d3 is input to the SOC 101. Further, when the interrupt signal d3 is input to the SOC 101, the timer circuit 128 is accessed, and whether or not the timer value M1 has been measured is held in the memory 140, and it is determined based on the result of accessing the memory 140. Also good. If the timer value M1 has been timed in this way, the process proceeds to S816; otherwise, the process proceeds to S705 in FIG.

  Step S816 is executed when the facsimile apparatus 100 satisfies the condition for shifting to the sleep mode. In S <b> 816, the CPU 200 performs various processing end processing in order to shift to the sleep mode. In the sleep mode, power is supplied to the modem 102 and the SDAA 104, but the modem 102 and the SDAA 104 are shifted to a low power consumption mode in which only minimal processing can be performed. In order to suppress the power consumption of the H relay 110, the H relay driving signal 111 is controlled to shift to a ringing incoming state in which the external telephone 128 and the communication line 130 are connected. Then, the CPU 200 changes the power output control signal 164 connected from the power controller 207 to the power circuit 125 to stop the power output 166 from the power circuit 125. In order to reduce power consumption, the CPU 200 itself shifts to a state where it is stopped until a signal is input from the power supply control unit 207 and shifts to the sleep mode. As a result, the CPU 200 stops executing the program until an interrupt signal is input to the power control unit 207.

  FIG. 9 is a flowchart illustrating processing when the facsimile apparatus 100 shifts to the sleep mode in S816 of FIG.

  When the CPU 200 is stopped in the sleep mode and cannot be determined, the determination in S902, S903, and S904 is performed by the power supply control unit 207. The power supply control unit 207 determines whether to return from the sleep mode based on the presence or absence of an input interrupt signal. The power supply control unit 207 may be configured to change processing depending on which of the interrupt signals d1, d2, d3, and d4 is input.

  In step S901, the CPU 200 and the power supply control unit 207 start the sleep mode. Then, the processing of the CPU 200 and the power supply control unit 207 proceeds to S902. In step S <b> 902, the CPU 200 and the power supply control unit 207 determine whether there is a cause for returning from the sleep mode from the keyboards 120 or the network I / F 127. Here, if a user operation on the facsimile apparatus 100 or various jobs are input from the network I / F 127, the processing of the CPU 200 and the power supply control unit 207 proceeds to S918 and performs processing of returning from the sleep mode. In step S <b> 918, the CPU 200 and the power supply control unit 207 perform processing for returning from the sleep mode in order to respond to user operations or input of various jobs from the network I / F 127. At this time, the power supply control unit 207 notifies the CPU 200 that an interrupt signal has been generated. When the CPU 200 detects that an interrupt has occurred, the CPU 200 returns from the stopped state and resumes execution of the program. After the CPU 200 returns from the stopped state in this way, the power source control unit 207 is accessed to check the interrupt factor, and then the factor is cleared. Then, it is confirmed which circuit has caused the activation factor, and various initialization processes such as returning the modem 102 to the normal state are performed. Thereafter, the CPU 200 controls the power supply control unit 207, changes the power supply output control signal 164, outputs (turns on) the power supply output 166 from the power supply circuit 125, and shifts to the standby mode.

  On the other hand, if there is no cause for returning from the sleep mode in S902, the process proceeds to S903, and the CPU 200 and the power supply control unit 207 determine whether there is a cause for returning from the sleep mode due to a change in line voltage from the modem 102. Here, when a CI signal is received from the public line 210 or when the external telephone 128 is off-hook, the line voltage changes, an interrupt signal d1 is generated from the modem 102 to the power control unit 207, and the line voltage is changed. It is determined that At this time, the modem 102 is in a low power consumption state, and it cannot be determined whether a CI signal is received, is off-hook, or there is a change in connection with the public line 210. However, the change in line voltage during the sleep mode is detected in real time. It can be detected. When it is determined that the line voltage has changed in this way, the processing of the CPU 200 and the power supply control unit 207 shifts to S906 and returns from the sleep mode to the standby mode.

  On the other hand, if it is determined in S903 that there is no change in the line voltage, the processing of the CPU 200 and the power supply control unit 207 proceeds to S904. In step S904, the CPU 200 and the power supply control unit 207 determine whether the timer values M1 and M2 have been measured. Here, when the interrupt signal d3 from the timer circuit 124 is generated and input to the power supply control unit 207, the power supply control unit 207 determines that the timer value M2 has been counted. When the power supply control unit 207 notifies the CPU 200 that an interrupt signal has been generated, the CPU 200 detects that an interrupt has occurred, returns from the stopped state, and resumes execution of the program. After the CPU 200 returns from the stopped state in this way, the power source control unit 207 is accessed to check the interrupt factor, and then the interrupt factor is cleared. Then, it is confirmed which circuit has caused the activation factor. The CPU 200 accesses the timer circuit 128 to determine whether the timer value M2 has been counted. At this time, since the mode is shifted to the sleep mode, the timer value M1 has been measured. Further, whether or not the timer values M1 and M2 have been timed may be stored in the memory 140 and may be determined by accessing the memory 140. If the timer values M1 and M2 have been measured, the processing of the CPU 200 and the power supply control unit 207 proceeds to S905. The process of S905 is executed when the facsimile apparatus 100 has not been operated for a certain period of time, no job has been input, and the communication line 130 is determined not to be connected to the public line 210. In S905, the CPU 200 controls the power supply control unit 207, turns on the power supply output 166 of the power supply circuit 125 by the power supply output control signal 164, and shifts to the standby mode. Then, after executing various end processes, the CPU 200 outputs a power output control signal 164 to the power circuit 125, stops the power outputs 165 and 166 from the power circuit 125, and shifts to the power off mode. When the power is turned off in this way, the CPU 200 is reset, so that the operation is stopped and the processing according to the flowchart ends. Thereafter, it does not return until the power switch of the facsimile apparatus 100 is turned on manually. If the interrupt signal d3 from the timer circuit 124 has not changed in S904, the processing of the CPU 200 and the power supply control unit 207 proceeds to S902.

  On the other hand, when it is determined in S903 that the line voltage has changed, the process proceeds to S906, where the CPU 200 and the power supply control unit 207 determine whether the facsimile apparatus 100 is connected to the public line 210, and then temporarily enter the standby mode from the sleep mode. Return to mode. As a result, the power control unit 207 notifies the CPU 200 with an interrupt signal, the CPU 200 returns from the stopped state by the interrupt and resumes execution of the program, and the CPU 200 performs various initialization processes such as returning the modem 102 to the normal state. carry out. Thereafter, the CPU 200 supplies a power output control signal 164 to the power circuit 125, turns on the power output 166 from the power circuit 125, and shifts to the standby state. Then, the process of the CPU 200 moves to S907.

  In S907, the CPU 200 accesses the modem 102 and detects the connection state between the communication line 130 and the public line 210. When the modem 102 is accessed at this time, the modem 102 is returned to the normal state in addition to the flag indicating that it is connected to the public line 210, is not connected, or the external telephone 128 is off-hook. The voltage value of the line 130 can also be acquired. The process advances to step S908, and the CPU 200 determines whether the state connected to the public line 210 has changed to the unconnected state. Whether the communication line 130 has been connected to the public line 210 or not has been previously stored in the memory 140 in S701. This can be determined by accessing the data and comparing it with the current state. If it is determined in this way that the state connected to the public line 210 has changed to unconnected, the process proceeds to S909, and if not, the process proceeds to S910. In step S909, the CPU 200 sets the timer value M2 in the timer circuit 124 to start timing. This is because the communication line 130 measures the time when it is not connected to the public line. At this time, it is held in the memory 140 that the communication line 130 and the public line 210 are not connected, and the process of shifting to the sleep mode in S919 is executed. As described above, when the connection state with the public line 210 becomes unconnected, the time for shifting to the power-off mode (timer value M2) is started and the mode shifts to the sleep mode.

  In S910, the CPU 200 determines whether or not the communication line 130 has changed from being not connected to the public line to being connected. If so, the process of the CPU 200 moves to S911, and if not, the process of the CPU 200 moves to S912. In S911, the CPU 200 clears the timer value M2 set in the timer circuit 124. This is because the communication line 130 and the public line 210 are connected, so that it is not necessary to shift to the power-off mode. At this time, the fact that the communication line 130 and the public line 210 are connected is held in the memory 140, and the process proceeds to S919. In S919, the CPU 200 immediately shifts to the sleep mode. In shifting to the sleep mode, the CPU 200 performs the same processing as that performed in S816. When the connection state with the public line 210 is thus connected, the time for shifting to the power-off mode (timer value M2) is stopped and the mode shifts to the sleep mode.

  Here, if it is determined Yes in S908 and then proceeds to S919 via S909, it means that the connection to the public line 210 is not established during the sleep mode. Therefore, in this case, even if it returns to the standby state once in S906, the process proceeds to S919 without waiting for the timer value M1 again to immediately shift to the sleep mode. As a result, it is possible to reduce power consumption by shortening the time required to shift to the power-off mode.

  Further, when the process proceeds to S919 via S911 after it is determined as Yes in S910, it means that the communication line is connected to the public line during the sleep mode. Therefore, in S906, even after returning to the standby state, the power consumption is suppressed by immediately shifting to the sleep mode. Then, when S919 is executed, the process proceeds to S902.

  If the communication line 130 is not changed from being not connected to the public line 210 in S910, the process proceeds to S912. The process of S912 is a process executed when the line voltage changes due to a change other than the change in the connection state between the communication line 130 and the public line 210. Accordingly, in S912, the CPU 200 controls the modem 102 to determine whether the voltage change of the communication line 130 is an incoming CI signal or an off-hook of the external telephone 128. When the voltage change of the communication line 130 indicates the arrival of the CI signal, the modem 102 sets a CI signal detection flag. Alternatively, if the SDAA 104 is not capturing DC, but the voltage of the communication line 130 is greater than or equal to the threshold voltage setting value A1 (threshold) or less than A2 (threshold), the external telephone 128 is capturing the line. The modem 102 sets a flag indicating this. At this time, since the modem 102 is returned to the normal state, it is also possible to access the modem 102 and acquire the line voltage value for determination. Then, the process of the CPU 200 moves to S913.

  In S913, the CPU 200 determines whether or not an incoming CI signal has been detected. As a result of S912, if the CI signal detection flag is set in the modem 102, the process of the CPU 200 proceeds to S914; otherwise, the process of the CPU 200 proceeds to S915. In step S <b> 914, the CPU 200 performs facsimile reception processing, and when this processing is completed, the processing ends. Since this is a normal process, details are not described.

  In S915, the CPU 200 determines whether or not the off-hook of the external telephone 128 has been detected. If the off-hook detection flag is set in the modem 102 as a result of S912, the process of the CPU 200 proceeds to S916. At this time, it is also possible to access the modem 102 to acquire the line voltage value and use it for the determination. In step S916, the CPU 200 performs a call process using the facsimile external telephone 128, and when the call process ends, the process ends. Since this process is a normal process, details are not described.

  If the off-hook is not detected in S915, the process of the CPU 200 moves to S917. The process of S917 is executed when it is determined that none of the above S908, S910, S913, or S915 applies. In S917, the CPU 200 determines that the voltage change of the communication line 130 is noise and that there is no change in the state of the communication line 130, continues to count the timer value M2, and shifts to the standby mode while maintaining the standby state. To do.

  FIG. 10 is a diagram illustrating an example of power transition in the facsimile apparatus 100 according to the first embodiment.

  FIG. 10 shows the transition of power when the standby line is not connected to the public line 210 but is connected to the public line 210 during the sleep mode, and shows the main steps of each step described in FIGS. The correspondence with the part will be described.

  When a change in line voltage is detected at time t10 in the standby mode (corresponding to Yes in S801 in FIG. 8), a connection state with the public line 210 is detected at time t11 (S802). In the standby mode, when it is determined that the connection to the public line 210 is not established as compared with the previous state (corresponding to Yes in S803), the timer circuit 124 is activated with the timer value M2 (time t11, S804).

  At time t2, the mode shifts to the sleep mode (corresponding to Yes in S815). At time t3, when a change in the line voltage is detected in the sleep mode (corresponding to Yes in S903), the device temporarily returns from the sleep mode to the standby mode (S906). Then, the connection state with the public line 210 is detected at time t31 in the standby mode (S907). If it is determined that the state has changed to the state connected to the public line 210 compared to the previous state (Yes in S910), the timer circuit 124 stops the timer value M2 from being timed (S911). At time t32, the mode immediately shifts to the sleep mode (S919).

  As described above, in the first embodiment, when the state is changed to the state connected to the public line 210, the time for shifting to the power-off mode is stopped. Can be prevented from moving to.

  In addition, at the time t32, the standby mode time can be shortened by shifting to the sleep mode immediately without waiting for the timer value M1 to be measured, so that the power consumption can be further reduced.

  FIG. 11 is a diagram illustrating another example of the power transition of the facsimile apparatus 100 according to the first embodiment.

  FIG. 11 shows the power transition when connected to the public line 210 in the standby mode but is not connected to the public line 210 during the sleep mode, and shows the steps of the steps described in FIGS. The correspondence with main parts will be explained.

  Transition to sleep mode at time t2 (corresponding to Yes in S815). When a change in the line voltage of the communication line 130 is detected at time t3 in the sleep mode (corresponding to Yes in S903), the sleep mode is temporarily returned to the standby state (S906). Then, the connection state with the public line 210 is detected at time t31 in the standby mode (S907). If it is determined at time t32 that the connection with the public line 210 has changed to the unconnected state in the sleep mode compared to the previous state (corresponding to Yes in S908), the timer value M2 is set in the timer circuit 124 and the time is measured. Is started (S909). Then, it immediately shifts to the sleep mode (S919).

  As a result, the time measurement by the timer value M2 is started from the time t32, so that the time can be measured from the time when it is determined that the connection to the public line 210 is disconnected during the sleep mode, and the mode can be shifted to the power-off mode at the time t4. Also, at time t32, the mode immediately shifts to the sleep mode without waiting for the timer value M1.

  As described above, in the first embodiment, when the state is changed to the state of being not connected to the public line 210, the time for shifting to the power-off mode is started immediately. Therefore, even in the sleep mode, the power is turned off when the predetermined time is counted. You can enter mode.

  In addition, at the time t32, the standby mode time can be shortened by shifting to the sleep mode immediately without waiting for the timer value M1 to be measured, so that the power consumption can be further reduced.

  In the first embodiment, it has been described that the power management is controlled according to the connection state between the communication line 130 and the public line 210. Although there is no description regarding whether or not the LAN 240 is connected, control can be performed in the same manner as the connection state with the line depending on whether or not the LAN 240 is connected. This means that the above-described first embodiment is applied independently of the connection with the LAN 240 or not.

  Incidentally, since the network IF 127 belongs to the first power supply system circuit 5001 as described above, power is supplied even during the sleep mode, and therefore, it is possible to accept a received packet from the LAN 240 in the sleep mode. Therefore, the connection state with the LAN 240 can be detected by detecting whether the link with the LAN 240 is established even in the sleep mode.

[Embodiment 2]
Next, a second embodiment of the present invention will be described. By detecting the connection state with the LAN 240, the facsimile apparatus 100 can be prevented from shifting to the power-off mode when connected to the LAN 240. Note that the configuration of the facsimile apparatus according to the second embodiment is the same as that of the first embodiment, and a description thereof will be omitted.

  In the second embodiment, when it is determined that the LAN 240 is connected, the time count by the timer value M2 is cleared, and thereafter, the time count by the timer value M2 is not started until the LAN 240 is not connected. Specifically, when connected to the LAN 240, the start setting process for measuring the timer value M2 in the flowcharts shown in FIGS. As a result, it is possible to avoid a situation in which the power switch of the facsimile apparatus needs to be turned on manually because the power-off mode is entered before the print job from the LAN 240 is input.

(Other embodiments)
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, etc.) of the system or apparatus reads the program. It is a process to be executed.

  The present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, in order to make the scope of the present invention public, the following claims are attached.

  DESCRIPTION OF SYMBOLS 101 ... SOC, 102 ... Modem, 104 ... SDAA, 105 ... Line capture circuit, 120 ... Keyboards, 124 ... Timer circuit, 125 ... Power supply circuit, 127 ... Network IF, 128 ... External telephone, 130 ... Communication line, 152 ... DC capture circuit, 200... CPU, 207... Power supply control unit, 210... Public line (PSTN), 206.

Claims (9)

Detection means for detecting changes in the line voltage;
A time measuring means for measuring time;
Detecting means for detecting a connection state with the line;
A transition means for transitioning to the sleep mode when the transition condition to the sleep mode is satisfied;
When the detection means detects a change in the line voltage in the sleep mode, the detection means returns to the standby mode and the connection state with the line is detected by the detection means, and the connection state detected by the detection means is not connected. When the connection is changed, when the time to shift to the power-off mode by the timing unit is stopped and the mode is shifted to the sleep mode, and the connection state detected by the detection unit is changed from connected to unconnected Is a control means for controlling to start counting the time to shift to the power-off mode by the timing means to shift to the sleep mode;
A communication apparatus comprising:   2. The communication apparatus according to claim 1, wherein the detection unit can detect whether the line is connected to the line, or whether the telephone is capturing the line or not connected to the line.   The detecting means is not connected to the line if the line voltage is equal to or lower than a first threshold value, and if the line voltage is equal to or higher than the first threshold value and equal to or lower than a second threshold value that is greater than the first threshold value, the telephone The communication apparatus according to claim 2, wherein the communication device is detected as being connected to the line if it is equal to or greater than the second threshold value.   4. The shift unit causes the time when the communication device does not operate continuously to be timed by the time measuring unit, and shifts to the sleep mode when the time measured reaches a first time. The communication device according to any one of the above.   5. The communication according to claim 1, further comprising: a power-off unit that turns off the power of the communication device when the time counting for shifting to the power-off mode by the time measuring unit is completed. apparatus. Power supply means further comprising a first power supply output for supplying power in the sleep mode and a second power supply output for supplying power in the standby mode;
2. The control unit according to claim 1, wherein the control unit controls the first and second power output of the power unit to return to the standby mode and to shift to the sleep mode. Communication device.   The communication device according to claim 1, wherein the detection unit and the time measuring unit operate even in the sleep mode. A control method for controlling a communication device, comprising:
A detection process for detecting changes in line voltage;
A time measuring process for measuring time;
A detection step for detecting a connection state with the line;
A transition process for shifting to the sleep mode when the transition condition to the sleep mode is satisfied,
When the detection step detects a change in the line voltage in the sleep mode, the state is returned to the standby mode, the connection state with the line is detected by the detection step, and the connection state detected by the detection step is determined as unconnected. When the connection is changed, when the time for shifting to the power-off mode by the timing step is stopped and the sleep mode is shifted, and the connection state detected by the detection step is changed from connected to unconnected Is a control step for controlling the start of the time to shift to the power-off mode by the time measuring step to shift to the sleep mode;
A method for controlling a communication apparatus, comprising:   The program for functioning a computer as a communication apparatus of any one of Claims 1 thru | or 7.

Images