The updated provides crucial performance fixes, removes legacy latency bugs , and ensures seamless rig control for ham radio operators using Windows 11 and macOS.
Most modern OS versions (Windows 10/11, macOS, Linux) recognize the VCP (Virtual COM Port) automatically.
Now that the old driver is gone, you are ready to install the new one. Run the installer you downloaded from FTDI. The process is simple: click "Next" and "Finish." The installer will place the new driver files in the correct system directory and register them with Windows.
For Silicon Labs chipsets, visit the Silicon Labs CP210x USB to UART Bridge VCP Drivers page. Step 3: Install the Driver Unplug the LDC101 cable from your computer.
Look for a device labeled "Silicon Labs CP210x USB to UART Bridge" or "USB Serial Port."
If you see pl2303 converter now attached to ttyUSB0 , your LDC101 is ready.
: The security enhancements in the updated driver provide peace of mind for users, ensuring that their data remains protected.
Look for "Silicon Labs CP210x USB to UART Bridge" or "Icom USB to Serial." Note the COM port number for your software settings. Troubleshooting USB-to-CIV Connections
The yellow triangle should disappear, and a working COM port number will be assigned. How to Prevent Windows from Re-Updating the Driver
| Metric | Old Driver (v3.6.2020) | Updated Driver (v6.7.9) | |--------|--------------------|---------------------| | CAT command latency | 45 – 80 ms | 12 – 18 ms | | CPU usage during polling | 3 – 5% | 0.4 – 0.7% | | PTT activation delay | 95 ms | 32 ms | | Dropouts per hour | 2 – 5 | 0 |
Updating to the latest driver ensures that your hardware complies with modern operating system security protocols and provides improved stability, especially when operating digital modes like FT8. How to Update the LDC101 USB to CI-V Driver (2026)
