Datasheet for the PC2002LRU-MSO-H-P1 character LCD module in PDF format, 133 KB. The 2002 part of the number conventionally means 20 characters on 2 lines, and the trailing MSO-H-P1 marks a particular option set and document variant. Content of such sheets usually includes interface pin list, power and LCD drive ratings, instruction timing and a dimension drawing. Handy for fault-finding a two-line display, confirming contrast adjustment range and making sure a replacement module matches pinout and footprint.
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.