Interface apparatus for mediating sending and receiving signals between devices connected by a signal line
First Claim
1. An interface apparatus for mediating the sending/receiving of signals between a plurality of devices that are mutually connected by a signal line having at least one pair of signal transmission lines D+ and D−
- , the interface apparatus comprising;
a signal relay section for relaying electric signals that are transferred via the signal line between the devices;
a connection determination section for determining, on the basis of signal voltage in each signal transmission line of the signal line, whether or not the devices are connected; and
a connection control section for incapacitating, when it has been determined by the connection determination section, based on a differential voltage of the D+ line and the D−
line, that the devices are connected, the signal relay section until the devices move to a state in which it is possible to mutually send/receive the signals.
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Accused Products
Abstract
In a CPU, a FET is turned off and power is not supplied to a power supply element of a transceiver for a period of time until predetermined initialization processing, which is implemented in a peripheral device when power is supplied via a cable from a host PC, has been concluded (i.e., a period of time until it becomes possible for the peripheral device to initiate data communication with the host PC). Thus, even if the peripheral device and the host PC are physically connected by a cable, data signals transmitted along signal lines are not relayed by the transceiver to a logic controller, whereby it in effect becomes possible to set the peripheral device in a pseudo-non-connected state with respect to the host PC.
11 Citations
18 Claims
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1. An interface apparatus for mediating the sending/receiving of signals between a plurality of devices that are mutually connected by a signal line having at least one pair of signal transmission lines D+ and D−
- , the interface apparatus comprising;
a signal relay section for relaying electric signals that are transferred via the signal line between the devices; a connection determination section for determining, on the basis of signal voltage in each signal transmission line of the signal line, whether or not the devices are connected; and a connection control section for incapacitating, when it has been determined by the connection determination section, based on a differential voltage of the D+ line and the D−
line, that the devices are connected, the signal relay section until the devices move to a state in which it is possible to mutually send/receive the signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- , the interface apparatus comprising;
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10. An interface apparatus for mediating the sending/receiving of signals between a plurality of devices that are mutually connected by a signal line having at least one pair of signal transmission lines D+ and D−
- , the interface apparatus comprising;
a signal relay section for relaying, when a differential voltage is within a predetermined value range, electric signals that are transferred via the signal line between the devices, the differential voltage value being a difference in respective signal voltages in the pair of signal transmission lines; a connection determination section for determining, on the basis of the signal voltage in each signal transmission line of the signal line, whether or not the devices are connected; and a connection control section for setting, when it has been determined by the connection determination section, based on a differential voltage of the D+ line and the D−
line, that the devices are connected, the differential voltage in each signal transmission line of the signal line to be outside the predetermined value range until the devices move to a state in which it is possible to mutually send/receive the signals. - View Dependent Claims (11, 12, 13, 14, 15)
- , the interface apparatus comprising;
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16. An interface apparatus for mediating the sending/receiving of signals between a plurality of devices that are mutually connected by a signal line having at least one pair of signal transmission lines D+ and D−
- , the interface apparatus comprising;
a signal input differential circuit and a signal output circuit for relaying electric signals that are transferred via the signal line between the devices; and a connection control section for controlling turning on/off of a power supply for driving the signal input differential circuit and the signal output circuit based on a differential voltage of the D+ line and the D−
line. - View Dependent Claims (17, 18)
- , the interface apparatus comprising;
Specification