A: That is a baud rate mismatch. Change the port settings from 9600 to 115200 (or vice versa). Also, check the plotter's internal menu for "BAUD" setting and match it exactly.
The Jinka 1351 cutting plotter relies on a USB-to-Serial communication chip to talk to your PC. Even though you plug a USB cable into your computer, the internal hardware of the plotter converts that signal into a COM (Serial) port connection. Most Jinka models use one of two main communication chips:
