A 141 KB PDF datasheet describing the PC0802LRU-ASO-H character LCD, a part code in the Powertip style for an 8-character, 2-line module, with ASO as the option code and H as the revision letter. Typical contents are the outline drawing, interface pin table, power and backlight ratings and bus timing. It serves when wiring the display to a microcontroller, troubleshooting missing characters or weak contrast, or matching a replacement. Verify the full suffix printed on the module before relying on figures.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @acodis_lcd_datasheets_EDID. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.