What to do if the Physik Instrumente Controller shows "No controller found"?
- AAdrian JohnsAug 13, 2025
When the PI host software starts and you receive a "No controller found" or “Could not connect...” error message, ensure that the COM port isn't in use by another program, the baud rate setting is correct (SW 5&6:ON for 9600 baud), the upper LED is green (if not, check the power), the firmware is current, a C-815.32 null-modem cable is used for RS-232, and only RS-232 or USB is connected, not both.