Could you please provide the name of the Adobe application you are performing the task.
Adobe discontinued the DV and HDV data capture firewire into the Premiere Elements Capture Window in Premiere Elements 13/13.1 and has done the same for the newly released version 14. The last version of Premiere Elements that has the feature is Premiere Elements 12/12.1.
Please see Removed features and unsupported file formats | Adobe Premiere Elements 13 in which Adobe has suggested some workarounds for the situation.
You can also consider doing the DV and HDV capture firewire in another program and then importing the captures into Premiere Elements project with Premiere Elements Add Media/Files and Folders.
Please let us know if you have questions or need clarification on this.