Hi Afshin,
By default, In our EJ2 Grid is purely web component(HTML, CSS and JavaScript) and its printing feature perform web page printing not windows, ESC Pos printing seems to print like emulator printing(window console or c program or other emulators).
If possible can you please create a simple HTML sample and check with ESC printer and share the sample and details with us that will helpful for us to analyze further and helps to integrate with our grid.
Regards,
Thavasianand S.