Directly powered via the USB interface; no external supply needed.
Siemens provides the PC Adapter USB A2 Driverdisk V1.0 for download on their support portal. pc adapter usb a2 driver windows xp
The driver for the A2 model isn't always a standalone download on the Siemens site because it’s usually bundled with their engineering software. Siemens SiePortal Built-in Drivers: If you already have STEP 7 (v5.5 SP4 or later) TIA Portal installed, the drivers are likely already on your system. Official Driver Disk: Directly powered via the USB interface; no external