You may need to manually roll back to a legacy Prolific driver version (such as v3.2.0.0) via the "Browse my computer for drivers" option in Device Manager, or upgrade to an FTDI-based LDC101 cable. Software Cannot Find the COM Port
Full compatibility with the latest Windows kernel updates, eliminating issues where the port "disappears."
You must identify which COM port the computer assigned to the LDC101 to configure your radio software. ldc101 usb to civ driver updated
If the port shows up in Device Manager but not in your logging software:
The LDC101 interface converts computer USB signals into the CI-V (Computer Interface Five) protocol used by Icom. CI-V operates on a TTL-level, bi-directional single wire. You may need to manually roll back to
Match the (Baud rate) to your specific Icom radio settings (usually 9600 or 19200 for older radios, and 115200 for modern rigs like the IC-7300).
You might see a notification that a new driver is available and wonder if it's worth the effort. The short answer is yes. Driver updates for devices like the LDC101 are not just about adding new features; they are frequently about maintaining basic functionality and stability across evolving computing platforms. CI-V operates on a TTL-level, bi-directional single wire
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.