Transmission control apparatus and image forming apparatus with transmission control apparatus
First Claim
1. A transmission control apparatus comprising:
- a first control board including a first control unit with an input/output port and a first board connector; and
a second control board including a second control unit with an input/output port and a second board connector, wherein the first control board is connected to the second control board via a general purpose cable, the general purpose cable is used for transmission of an indication signal as a digital signal and is also used for serial communications, the digital signal being used for controlling a power supply mode transition,wherein the first control unit and the second control unit transition to a specific power mode of three or more power modes according to a change in a logical value indicated by the indication signal and a length of a specific period during which the changed logical value is being indicated by the indication signal,wherein the first control board includes a first storage unit, the second control board includes a second storage unit, and the first storage unit and the second storage unit store information in which the change in the logical value indicated by the indication signal and the lengths of the periods during which the changed logical value is being indicated by the indication signal are associated with transitions among the three or more power modes, andwherein the first control unit and the second control unit transition to the specific power mode in response to detecting an elapse of the specific period after the change in the logical value.
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Accused Products
Abstract
A transmission control apparatus includes a first control board including a first control unit with an input/output port and a first board connector; and a second control board including a second control unit with an input/output port and a second board connector. The first control board is connected to the second control board via a general purpose cable, the general purpose cable is used for transmission of an indication signal as a digital signal controlling a power-supply mode transition and is used for serial communications. Lengths of change periods, during which a logical value of the indication signal is changed and with which transitions among three or more power-supply modes are associated, are preset and stored in the first control unit and the second control unit, respectively. The power-supply mode is transitioned to a specific mode according to the lengths of the change periods of the indication signal.
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Citations
10 Claims
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1. A transmission control apparatus comprising:
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a first control board including a first control unit with an input/output port and a first board connector; and a second control board including a second control unit with an input/output port and a second board connector, wherein the first control board is connected to the second control board via a general purpose cable, the general purpose cable is used for transmission of an indication signal as a digital signal and is also used for serial communications, the digital signal being used for controlling a power supply mode transition, wherein the first control unit and the second control unit transition to a specific power mode of three or more power modes according to a change in a logical value indicated by the indication signal and a length of a specific period during which the changed logical value is being indicated by the indication signal, wherein the first control board includes a first storage unit, the second control board includes a second storage unit, and the first storage unit and the second storage unit store information in which the change in the logical value indicated by the indication signal and the lengths of the periods during which the changed logical value is being indicated by the indication signal are associated with transitions among the three or more power modes, and wherein the first control unit and the second control unit transition to the specific power mode in response to detecting an elapse of the specific period after the change in the logical value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification