Complete and Test:
RedSail’s official macOS support is sparse. However, since most plotters use the CH340 chip, macOS has built-in drivers—but they are often uninitialized.
Case A: CH340/CH341 chipset (most common) redsail cutting plotter usb driver install
Case B: CP210x
Case C: Generic CDC (usbser.sys)
Case D: Vendor RedSail specific driver
To always use COM5 (avoid shifting ports): Complete and Test :
| Problem | Cause | Solution |
|---------|-------|----------|
| Device shows USB Serial Converter but no COM port | Driver installed as WinUSB, not VCP | Reinstall with VCP driver (CH341/CP210x proper) |
| Yellow exclamation Code 10 | Driver conflict or resource conflict | Uninstall device → Scan for hardware → Use different USB port |
| Driver installs but cutting software no connection | Wrong COM port or baud rate | Check Device Manager COM number → change software COM port |
| Plotter cuts mirrored or wrong size | USB driver correct but software config wrong | Set origin: bottom-left, correct page size in cutting software |
| Works once, then disconnects after reboot | Windows fast startup | Disable Fast Startup in Power Options → Shutdown and restart |
| Device cannot start (Code 31) | Driver signature blocked | Boot with disabled signature enforcement or switch to official signed driver (CH341SER v3.5+ is signed) |
This is the most common mistake. If you plug in the plotter before installing the driver, Windows assigns it a generic “USB Composite Device” driver that will conflict. RedSail’s official macOS support is sparse
If USB driver fails completely: