This guide explains how to connect an Diagnostic interface cable based on FTDI converter (e.g., FT231) to a Mac and use it with e.g. STAG and Landi Renzo diagnostic software via Wine. With this setup, you can adjust your LPG installation without needing Windows.
Requirements
To follow this guide, you'll need:
- diagnostic cable with an FTDI chip (e.g., FT231)
- Mac computer (works on Apples silicon and Intel)
- Wine (software to run Windows applications on Mac)
- One of the following programs:
- AC STAG (for STAG LPG systems)
- Landi Renzo Omegas 4.2 (for Landi Renzo LPG systems)
- all others programs depends on your ecu type...
Step 1: Connect the Cable and Check if Mac Detects It
Plug the diagnostic cable into an available USB port on your Mac.
Open Terminal (find it in Applications > Utilities or search via Spotlight with Cmd + Space).
Type the following command:
You should see something like this:
If nothing appears:
- Unplug and reconnect the cable.
- Install FTDI drivers (download the macOS version, install, and restart your computer).
Step 2: Configure Wine to Recognize COM1
In Terminal, type:
In Terminal, type (replace YOUR_CABLE_NAME with what you saw in Step 1, e.g., usbserial-A50285BI):
Example:
In Terminal, type:
In the window that appears, navigate to:
You should see an entry COM1 with the value \Device\Serial0.
If it's missing:
- Right-click → New → String Value.
- Enter:
- Name:
COM1 - Value:
\Device\Serial0
- Name:
Close regedit.
Step 3: Launch the Diagnostic Software (STAG or Landi Renzo)
If you don’t have the software yet, download it and install via Wine:
(Replace program_name.exe with the actual filename).
In Terminal, type (adjust the path to your program):
Or for Landi Renzo:
In the software, go to connection settings and select:
- Port:
COM1 - Baud rate:
9600or115200(check the software manual).
Click Connect and verify if the software communicates with your LPG system.
⚠️ Troubleshooting
❌ Software doesn’t detect COM1
- Check the symlink:
ls -l ~/.wine/dosdevices/com1It should display something like:lrwxr-xr-x 1 yourusername staff 25 Jan 10 12:34 com1 -> /dev/cu.usbserial-A50285BIIf missing, recreate it (Step 2).
- Grant permissions to the port:
sudo chmod 666 /dev/cu.YOUR_CABLE_NAME(Enter your Mac password—nothing will display as you type—then press Enter).
❌ Software freezes or fails to connect
- Run Wine as root (use with caution!):
sudo wine ~/.wine/drive_c/Program\ Files/PROGRAM_NAME/program.exe
- Install Wine Staging:
brew install --cask --no-quarantine wine-staging(Then relaunch the software).
Still not working?
If nothing helps, consider:
- Using a virtual machine (e.g., VirtualBox with Windows).
- Consulting a specialist (avoid risking damage to your LPG system!).
Summary
If everything went smoothly, you should now be able to:
- ✅ Connect to STAG or Landi Renzo LPG systems.
- ✅ Read error codes and adjust settings.
We hope this guide was helpful!