Dsc Serial Protocol
The loading of the appropriate driver is done using a PID/VID (Product ID/Vendor ID) combination supplied by attached hardware. When the new device first plugs in, the host enumerates it and loads the device driver necessary to run it. In order to help user to identify maximum speed of device, a USB device often specifies its speed on its cover with one of the USB special marketing logos. Without a pull up resistor, USB assumes there is nothing connected to the bus. These pull up resistors at the device end will also be used by the host or hub to detect the presence of a device connected to its port. USB 1.0 and USB 2.0 shares same connector pinout, USB 3.0 pinout and USB Type C features new connectors with their own pinouts.Īn USB device must indicate its speed by pulling either the D+ or D- line high to 3.3 volts.
Additional USB hubs may be included allowing branching into a tree structure with up to five tier levels.
DSC SERIAL PROTOCOL PORTABLE
Due to the ability to supply power to the preipheral devices USB is often used as a power charger for portable devices.Īn USB system architecture consists of a host controller, a USB ports, and multiple connected devices.
DSC SERIAL PROTOCOL PC
Nowdays USB has replaced a variety of earlier PC interfaces (such as RS-232 serial, parallel port, and even FireWire). Universal Serial Bus (USB) is an interface to establish communication between devices and a host controller (usually personal computer).