I have some Xprinter XP-350 and XP-370 label printers - they have an RJ11 port just like the EPSON POS printers do. Although the usual EPSON ESC p command isn't working on these printers. They use the TSPL programming language so I have tried the SET GPO command from the programming manual. Specifically, I have tried: SET GPO2 POS, 0, 20, 20, 100, PRINT, but have had no success.
I also can't find a programming manual for this specific printer.
