[Nut-upsuser] Power Shield Defender 1200 - The Story Continues [HCL]

[Charles Lepple]

On Mar 7, 2020, at 2:02 AM, HILL Walter <hill at ieee.org> wrote:
> 
>   idVendor           0x0665 Cypress Semiconductor
>   idProduct          0x5161 USB to Serial
[...]
> N.B. the Product ID and Vendor ID are unchanged between the two models
> despite the fact that they function and operate quite differently.
> 
Thanks for the information - sorry to hear you are dealing with this sort of "truth-in-labeling" issue on top of the instability of the old model.

Further down in the lsusb output should be some information about the HID interface. A good distinguishing factor between Power Device Class (PDC) HID devices and simpler serial-over-HID devices is the size of the HID descriptor. What does the newer model show for wDescriptorLength? Here's an example for an APC:

Bus 006 Device 002: ID 051d:0003 American Power Conversion UPS
Device Descriptor:
[...]
  bNumConfigurations      1
  Configuration Descriptor:
[...]
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.00
          bCountryCode           33 US
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength     515