6 - Operation
DynaFlex and DynaFlex Pro| Three-way Secure Card Reader Authenticators | Installation and Operation Manual
Page 40 of 56 (
D998200382-10
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6.6.8
About USB Suspend
When the device is connected to a host via USB (see section
4.3.2 How to Connect DynaFlex to a Host
), the host and its operating system can use standard USB functions to put the device
into
USB Suspend
mode to conserve power (see section
). This generally
occurs when there is no software running on the host that has an active USB connection with the device.
When the device goes into USB Suspend mode, the device’s display and LEDs turn off. When the host
wakes up the device from USB Suspend, the device returns to normal operation.
It is possible to configure a Windows host to not suspend the device by editing the registry. Open
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB\VID_0801&PID_2020
, then
open the folder with the device’s serial number inside that folder, and open the
Device Parameters
folder inside that. Set the value of
EnhancedPowerManagementEnabled
equal to
0
. After changing
the setting, physically disconnect and re-connect the device to the host.
