The Zelio SR2 is a range of compact, modular, and safe PLC (Programmable Logic Controller) devices designed by Schneider Electric. The USB01 refers to a specific communication module or interface used for connecting these PLCs to a computer via USB.
| Error in Device Manager | Likely Cause | 2021 Fix | | :--- | :--- | :--- | | Code 10 (Device cannot start) | Windows 10 blocked the old Prolific chip. | Install legacy Prolific driver v3.3.2.105 (Section 4). | | Code 43 (Device descriptor failed) | Corrupt driver or USB port power issue. | Try different USB port (USB 2.0, not USB 3.0). Unplug other USB devices. | | "Unable to open COM port" in Zelio Soft 2 | Wrong COM port number (>16) or software mismatch. | Change COM port number to 1-16 in Device Manager > Advanced. | | Driver is not digitally signed | Windows 10’s integrity check. | Disable driver signature enforcement (temporarily) or use the signed driver from Schneider (post-2020). | zelio sr2 usb01 driver windows 10 download 2021
Before downloading any driver, ensure you have the following: The Zelio SR2 is a range of compact,
If running the downloaded installer does not immediately resolve the issue, you must force Windows to use the driver files manually. Before downloading any driver, ensure you have the
When plugging the SR2USB01 cable into a USB port, Windows 10 will often attempt to install a driver automatically. In many cases, this fails, resulting in the cable appearing under Device Manager as an "Unknown Device" or a "USB-Serial Controller" with a yellow warning triangle. This happens because the chip inside the SR2USB01 cable requires a specific Virtual COM Port (VCP) driver that Windows 10 does not include in its standard driver library.
Once the driver is installed, follow these hardware steps:
