CAMBRIONIX OEM-U8S, Руководство пользователя

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OEM-U8S Page 17 of 43
5.3. Managing Ports & Your OEM-U8S
Each port on your OEM-U8S can be managed either individually, or all together. You can turn the ports
off and on, change the port mode, or change various other settings applicable to the OEM-U8S more
information can be found in the
LiveViewer section under NVRAM settings. This can be done through
LiveViewer, the CLI or by connecting to the hub via the API.
5.3.1 Port Modes
Charge
Turn specific ports or the whole hub to charge only mode (no data
connection, hub emulates an OEM
charger)
Sync Turn specific ports or the whole hub to sync mode
Biased Detect the presence of a device but it will not sync or charge it
Off
Turn specific ports on or off or switch the whole hub on or off (no power and no
data channels open, mimics unplugging the device)
5.3.2 Switching port modes
You can switch between port modes by using LiveViewer, the CLI or by connecting to the hub via the
API. If you switch a port off then this will stop any connection taking place to the USB
device and
would mimic unplugging the USB device completely from the host system.
If you are in Sync mode and then switch to Charge mode the USB device will disconnect briefly whilst
the profiling process takes place. Once the profiling has taken place, and a charging profile is
selected, the device will then draw a charge rate, which will be defined by the charging controller
within the USB
device. The charging profile will limit the maximum amount that the device is able to
draw.
If you are in Off or Charge mode and switch to Sync mode the USB device will disconnect briefly
whilst a data connection is opened, the USB
device will then become available to the host as if the
USB device is connected directly to the host, and will be able to sync data at a maximum rate of 480
(Mbps). The OEM-U8S will also charge the device whilst connected. It is impossible to have a data
connection to a USB
device without any power negotiating, you can reduce the charging rates
available by disabling CDP (Charging downstream port).
You can disable CDP through NVRAM settings either by going through the hub settings and turning
"Sync charge" off or through the API and disabling it via code. For example, using the command line,
the instructions would be as below.
settings_unlock
settings_set sync_chrg 0000000000000000