HID Sensor Usage Tables - USB.org

57 HID Sensor Usages
3. Sensor Interaction via HID
This section describes how communication with Sensors is mapped to HID mechanisms. This section is
Informative, which means it is only for orientation and guidance.
3.1 Related Documents
The following documents provide additional information related to or referenced by this document. All of
the documents listed below are available on the Internet at http://www.usb.org.
[1] Universal Serial Bus Specification
[2] Device Class Definition for Human Interface Devices (HID)
[3] Universal Serial Bus HID Usage Tables
[4] Universal Serial Bus HID Point of Sale Usage Tables
[5] HUTTR30 Addition of usages related to touch digitizers
[6] HUTTR34 Addition of usages related to multi-touch digitizers
[7] Device Class Definition for Physical Interface Devices (PID)
3.2 Functional Overview
The Functional connection model for the Sensor class is below. There are two roles of communication.
The host computer initiates requests. One or more sensor devices reply to the requests.
HID defines communication channels called Pipes. Every host and device must have a bidirectional
Control Pipe. Devices may use additional Pipes for unidirectional communications.
For Sensor Devices, the HID Input Pipe is mandatory, and the HID Output Pipe is optional.
Each end of a Pipe is called an Endpoint.
Figure 4. HID Functional Model
The data transfer mechanism for the Sensor class is based on the HID class Report Descriptors.
Communication with a Sensor device is identical to that of a HID device.