: Found in certain upgraded or older variations of the machine.
The software is looking for COM1, but your USB is plugged into COM3.
The manufacturers of and SignMaster software bundle a universal fixed driver for Jinka plotters. If you own a legitimate license, download the "Driver Pack" from their website. The file will be called UM_HS_JINKA_FIX.inf .
For those comfortable with command-line operations, Inkscape (a free, open-source vector graphics editor) can be configured to work with the Jinka 1351 using PySerial.
Set baud rate to or 38400 (depending on your machine settings). Troubleshooting: Still Not Working?
: Connect the Jinka 1351 to your Mac.