The LDC101 is a USB-to-Serial interface adapter designed for CI-V protocol communication, primarily used to control Icom amateur radios via CAT (Computer Aided Transceiver) software. The recent driver update ensures compatibility with the latest Windows 10/11 builds and improves USB-C connection stability.
Target Audience: Amateur Radio Operators (Hams) using rig control software (e.g., Ham Radio Deluxe, WSJT-X, N1MM, Fldigi).
Security notes:
The updated driver for the LDC101 USB-to-Civ interface addresses compatibility issues with modern Windows operating systems, specifically resolving "Device Descriptor Request Failed" errors and unsigned driver warnings in Windows 10/11. The update transitions the interface from legacy hardware ID mappings to a standardized Virtual COM Port (VCP) architecture, improving handshake stability during radio firmware flashes. ldc101 usb to civ driver updated
sudo apt update
sudo apt install dkms build-essential
git clone https://github.com/ldc-support/ldc101-civ-driver
cd ldc101-civ-driver
sudo make install
sudo modprobe ldc101_usb
The LDC101 is typically a low-noise, precision current source used to drive laser diodes. To enable computer control, it uses a command-based protocol known as CIV—a structured set of text commands that control parameters like current setpoint, temperature, and output status. The “USB-to-CIV” driver translates generic USB data packets from the computer into CIV commands the LDC101 understands, and vice versa. Without a correct, updated driver, the operating system cannot recognize the LDC101 as a valid instrument, rendering it inaccessible for automated tasks or data logging.
| Platform | Driver Version | Download Source |
|----------|----------------|------------------|
| Windows 10/11 | v3.2.1 | [Official Support Portal] |
| macOS (Intel/M1/M2/M3) | v2.0.4 | [Download Link] |
| Linux (Ubuntu/Debian/Raspbian) | kernel module included | sudo apt install ldc101-civ-dkms |
The phrase "LDC101 USB to CIV driver updated" is a critical search query because these adapters have a notorious history of failing after a Windows update. Here is why: The LDC101 is a USB-to-Serial interface adapter designed
Thus, finding a working, updated driver is not just a luxury—it is a necessity.
Q: Is the LDC101 driver the same as the "Icom CT-17" driver?
A: No. The CT-17 is a level converter that uses a standard DB9 serial port. The LDC101 is a USB-to-TTL direct cable. Drivers are not interchangeable.
Q: My radio is Icom IC-910H. Will the updated driver work?
A: Yes. The IC-910H uses standard CIV at 19200 baud. The LDC101 plus the updated driver works perfectly. Reboot (recommended)
Q: Why does my LDC101 show up as "USB Serial Port (COM7)" but not as "LDC101"?
A: That is normal. The generic name does not affect function. You can rename it in Device Manager under "Port Settings" → "Advanced" → "COM Port Name".
Q: Can I use this cable for PTT without VOX?
A: Yes, if your LDC101 includes the DTR/RTS lines. Most standard LDC101 cables do not support hardware PTT—only CIV. For PTT, use a separate line or rely on VOX.