What is USB companion port?
Companion controller is defined as multiple USB host controllers (XHCI/EHCI/OHCI/UHCI) that are wired to the same physical connector such that a device, depending on some characteristic like speed, will be connected to a different controller even when plugged into the same connector.
How are USB ports numbered?
In most cases, you can tell if a USB port is 2.0 or 3.0 by looking for a blue marking at the bottom of the port, if it’s blue, then it’s USB 3.0 or higher. In some cases, all the ports on a device are USB 3.0, but most machines use a combination of 2.0, 3.0, and even other variations like USB-C, on the same device.
How do I find my USB port ID?
Go to Control Panel > Device Manager and find your USB device. Double click the device or right click and select Properties. Go to the Details tab and select Hardware ID to view its PID and VID.
How do I identify a USB 3.0 port?
First, check the physical ports on your computer – USB 3.0 ports are sometimes (but not always) blue in color so if any of your USB ports are blue then your computer is equipped with USB 3.0. You can also check the logo above the port for the USB 3.0 SuperSpeed logo (pictured below).
How do I find my USB port number Windows 10?
Replies (5)
- Open Device Manager.
- Click on View in the menu bar and select Show hidden devices.
- Locate Ports (COM & LPT) in the list.
- Check for the com ports by expanding the same.
What happens if you plug a USB 2.0 into a USB 3.0 port?
Yes, USB 3.0 backwards is compatible—meaning it’s designed to work with older USB versions including USB 2.0 and USB 1.1. You can plug a USB 2.0 device into a USB 3.0 port and it will always work, but it will only run at the speed of the USB 2.0 technology.
What is a USB 2.0 port?
USB 2.0: it is also known as hi-speed USB. It was introduced in 2000. It is an updated version of USB 1.1, which provides improved functionalities and better speed. It is capable to deliver the maximum transfer speed of 480 Megabits per second. However, practically it is approximately 280 Mbps.
How do I find the COM port number of a USB port?
Follow the instructions to get your COM port number:
- Open Device Manager (Start → Control Panel → Hardware and Sound → Device Manager)
- Look in the Device Manager list, open the category “Ports” and find the matching COM Port.
- Take the number in the bracket behind the port description.
How do I change the USB port number in Windows 10?
SOLUTION
- Go to Windows Device manager > Multi-port serial adapters.
- Select the adapter and right click to open the menu.
- Click on the Properties link.
- Open the Ports Configuration tab.
- Click on the Port Setting button.
- Select the Port Number and click OK.
- Click OK to apply the changes.
How do I get information about all companion ports?
If more than one companion port is associated with the port that is being queried, the application can get information about all companion ports by sending the IOCTL_USB_GET_PORT_CONNECTOR_PROPERTIES I/O control request in a loop and incrementing the CompanionIndex value in each iteration.
Why is the companionindex of a port always 0?
If a port is mapped to more than one companion port, CompanionIndex is incremented on multiple queries to enumerate all companion ports. For SuperSpeed hubs and xHCI controllers, CompanionIndex is always 0.
What does companionportnumber mean?
If the port being queried shares a USB connector with a port on another hub, CompanionPortNumber indicates the port number of the port on the other hub. Note For root hub of an xHCI controller, the shared port might be on the same hub. The Unicode string that contains the symbolic link of the companion hub that shares the USB connector.
What does companionportnumber mean on the xHCI controller?
If the port being queried shares a USB connector with a port on another hub, CompanionPortNumber indicates the port number of the port on the other hub. Note For root hub of an xHCI controller, the shared port might be on the same hub.