javapos: how to set font size?

Question

I'm using javapos 1.15 to print on some epson thermal printer. All basics feats works properly except one: I don't know how to change the font size (neither type, but that's ok). According to documentation I could use some escaped caractere but none works. I can make text wider and bolder but not smaller.

Any help here?

So basically

mPrinter.printNormal(POSPrinterConst.PTR_S_RECEIPT,ESC+"|bC hello"); //That's works mPrinter.printNormal(POSPrinterConst.PTR_S_RECEIPT,ESC+"|50P hello"); //doesn't works

Thanks in advance

(fyi I print on epson TM-m30 that allow all text size (works fine with and AndroidEpsonSDK))

Answer 1

To change the font size (decrease), you need to change the RecLineChars property.
Only the values contained in the RecLineCharsList property can be specified for the RecLineChars property.

It cannot normally be specified in the middle of a PrintNormal print request string.
It may be possible to support it as a vendor-specific feature, but even in that case, it is only possible to change line units, and it is not possible to change only the middle of a line.