Technical specification in PDF for the PC2002LRS-ESO-H module, a 20 by 2 character LCD according to its numeric code. Suffix letters ESO-H define the specific build, which can affect backlight colour, viewing direction or operating temperature. A technician typically consults this kind of file for header pin functions, supply limits, backlight LED ratings and mechanical outline. Measure VDD, contrast voltage and backlight feed against the listed values before condemning the panel, and match the module label exactly.
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.