sending to a EPSON TM-T20II don't work with ESP32-S3

[daninavarro10]

I tried the usbhprinter example with the same hardware connection as the example but with an EPSON TM-T20II and a ESP32-S3-devkit-M-1 instead.

I made a print test in order to see if can be printed and the first time never prints. It does not get any error on the print queue but the ESP32-S3 restarts itself. As I am using the serial port I can't see why it's restarting. Next time I print without flashing the code it prints.

This also happens when I try to send from a real POS to the ESP32 and then to the printer. The second time I try to print it prints but with a lot of spaces in between (0x20 in hex).

If I use YAT (or another terminal program) in the selected port to send the ticket it works well. But my main goal is to be able to print a real ticket from a real POS.

Any idea of why is restarting itself whenever I send from a POS?
Thank you.

[urobot2011]

I heard that older EPSON printers use their own protocol :)