| Problem | Solution | |--------|----------| | with PL-2303 | Windows 10/11 blocks old PL-2303 non-HXD chips. You must use a PL-2303 HXD cable or buy original Siemens. | | Driver date showing 2019 or 2021 but not working | Disable driver signature enforcement temporarily for old drivers, or use a VM with Windows 7. | | Clone cable works on Win7 but not Win10 | Install Prolific v3.3.2.102 (2015) after disabling driver signature enforcement – risky but sometimes needed. | | STEP 7 Micro/WIN cannot find PLC | Check baud rate (usually 9.6 kbps or 187.5 kbps), multi-master enabled, and only one device on the bus. |
