I’ve seen it do this when the DIP switches on a serial printer are set to a baud rate of 115200 but the PC is sending at 9200bps. Especially when sending graphics, like a logo, but also just when connected and not even receiving a print job.
You’ve got to edit the printer port in windows to force 115200 baud rate.
Heaps of these receipt printers still use a serial COM port.
I’ve seen it do this when the DIP switches on a serial printer are set to a baud rate of 115200 but the PC is sending at 9200bps. Especially when sending graphics, like a logo, but also just when connected and not even receiving a print job.
You’ve got to edit the printer port in windows to force 115200 baud rate.
Heaps of these receipt printers still use a serial COM port.
Thanks for the perspective! I never had a chance to play with one of them.