Usb Low Power Mode Transition Condition; Usb Selective Suspend; Usb Low Power Mode Communication Sequence - Opticon MDI-4000 Series Serial Interface Manual

MDI-4000 Series Serial Interface Manual
5.3.3

USB Low Power Mode Transition Condition

For the USB interface, the scan engine shifts to low power mode when these conditions are
met:
•
The scan engine's low power mode is enabled.
•
The scan engine passed the specified time (transition time) in standby state.
•
The USB bus shifted to SUSPEND mode. The USB bus may be moved to SUSPEND
mode when successful USB communication (like reading data or command data) is not
performed for a certain period of time. The USB host device manages this mode.
5.3.4

USB Selective Suspend

The USB selective suspend feature lets the hub driver suspend an individual port without
affecting other ports on the hub. This feature helps conserve battery power. You can set
selective suspend for USB-COM (using the USB as a virtual COM) and USB-HID (using the
USB for key code input) communications.
Set Selective Suspend for USB-COM
1. Install the Opticon USB Code Reader driver Version 3.0.0.0 or later.
2. Enable USB Selective Suspend.
Set Selective Suspend for USB-HID
1. Connect the scan engine to a PC running Microsoft Windows 10. The native Microsoft
HID class driver performs the HID connection.
2. To enable USB Selective Suspend, modify the registry that controls the HID class driver.
For more information, go to the
5.3.5

USB Low Power Mode Communication Sequence

The scan engine detects when the host shifts to SUSPEND mode and transitions to low power
mode. The next diagram describes the scan engine and USB host device communication
sequence.
42
[Microsoft] MSDN HID USB peripherals webpage.