You may need to manually roll back to an older, legacy version of the Prolific driver (such as version 3.2.0.0 or 3.3.2.102) that still supports older hardware architectures. Alternatively, replacing the cable with an FTDI-backed version solves this permanently. Software Fails to Connect to Rig (Timeout Errors)
It converts the universal serial bus (USB) signaling from your PC or laptop into the single-wire TTL voltage levels required by the Icom CI-V protocol.
If you encounter errors like "Rig Control Error" or "Timeout reading hex from rig," use these troubleshooting steps to locate the bottleneck. Error: "Device Cannot Start (Code 10)"
Sometimes the driver works perfectly until you press the PTT button on your microphone or transmit digital modes at high power. High-power RF leaking into the shack can cause the USB bridge chip to freeze, forcing the driver to crash. Ld-c101 Usb To Ci-v Driver
One popular hardware solution for this connection is the LD-C101 USB to CI-V cable. This guide provides everything you need to know about finding, installing, and troubleshooting the LD-C101 driver to ensure flawless rig control. What is the LD-C101 USB to CI-V Cable?
: Websites like GitHub, SourceForge, or even generic driver databases might host the driver. However, be cautious when downloading from third-party sites to avoid malware.
Windows is notorious for shutting down USB ports to save electricity. Go to Device Manager , right-click your USB Root Hubs, select Properties > Power Management , and uncheck the box that says "Allow the computer to turn off this device to save power." You may need to manually roll back to
The is the invisible bridge between your computer and your Icom transceiver. While the hardware costs less than $20, without the correct driver, it is a useless piece of plastic and wire.
: Widely considered the most stable and reliable chipset for amateur radio applications.
If you plug the LD-C101 into a different USB port on your PC, Windows may assign it a completely new COM port number. Try to always use the exact same physical USB port for your radio setup, or manually reassign the COM port number to a static value in the Advanced properties tab of Device Manager. RF Interference (RFI) Drops If you encounter errors like "Rig Control Error"
: Roll back the driver to an older, verified version (such as Prolific version 3.2.0.0 or older) through Device Manager, or explicitly use the driver provided by the cable vendor. Rig Control Disconnects When Transmitting (RF Interference)
| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | | Driver is missing, corrupted, or outdated. | Uninstall the device from Device Manager, rescan for hardware changes, then reinstall the latest Silicon Labs driver. | | Correct COM port appears, but no radio control | Incorrect CI-V address, baud rate, or connection order. | Double-check your radio's CI-V settings. Ensure the radio is ON and connected to the cable before launching the software. | | Cable works, but only for a short time | Power saving settings or a loose connection. | In Device Manager, open the COM port's properties and disable "Allow the computer to turn off this device to save power." | | Software logs QSOs, but doesn't change frequency | Wrong serial port selected, or software is in "Polling" mode. | In WSJT-X, try setting Polling interval = 0 to disable polling and rely on the radio's updates. | | Driver conflicts after installing multiple types | Competing drivers for the same hardware. | Uninstall all USB-to-serial drivers, restart, and then install only the one required for your cable (e.g., only Silicon Labs). |