KEYENCE LJ-H1W - Manual (Page 87)

USB Communication Failure
A
Appendix-3 LJ-H1W-M-NOA-E
3
Select the device that is not recognized correctly on the device manager.
Look for a device with the "?" or "!" mark next to the name.
If the controller is not recognized correctly, it appears as one of the following:
• "?" or "!" mark next to "KEYENCE LJ-G (USB)"
• An "Unknown device"
If either of these devices is displayed, double-click on the device name. The property window for the
selected device is displayed.
Reference
If there are multiple devices named "Unknown device", check for the device under "USB controller".