| 摘要 |
A portable terminal device includes a connector connected to a mobile telephone terminal device providing a signal that changes its output depending upon whether power is turned on or not, a power-on detection device connected to the connector, a power supply circuit under control of the power-on detection device, and a data communication device receiving power supply from the power supply circuit, and under control of the output of the power-on detection device. The data communication device includes a processor that activates system software when power supply is initiated. The system software activates communication software in response to an output of the power-on detection device. The portable terminal device can include a data adapter unit coupled between the data communication device and the connector. The data adapter unit may have power controlled by the output of the power-on detection device.
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