edf8e16c_NC_USB_HID_interface_component__Description
[USB Data Type] USAGE=ALPHA_NUMERIC_DISPLAY [Common Usage] LCD [Description] 
hidcomp supports standard character only alphanumeric displays. It has been tested with 1x8, 2x20 and 4x20 displays, but should be able to cope with any size. This has only been tested against a home made USB Alphanumeric display, and as such, may need to be tweaked to make work with other displays. The requirements at the moment are... USAGE_ROWS and USAGE_COLUMNS must appear in a feature report. USAGE_ROW, USAGE_COLUMN, USAGE_CLEAR_DISPLAY and USAGE_DISPLAY_DATA must appear the output report to render the screen. USAGE_DISPLAY_DATA must be a whole line long.
hidcomp - EMC/LinuxCNC USB HID interface component
Description