| 摘要 |
<p>A Universal Serial Bus (USB) adaptor (16, 16', 16"), compatible with standard USB connectors, provides a simplified interface between a portable communications device (12) and a USB accessory (14, 14'). An encoder (28) provides an operating state to the portable communications device (12), enabling the portable communications device (12) to perform as either a USB host or a USB function accessory. A function adaptor (16') selects its DC power source and is capable of providing DC power to a function accessory (14'). The host adaptor (16) can obtain DC power from a host accessory (14), according to USB standards.</p> |
