ABB PQFS Installation, Operation And Maintenance Instructions page 138

USB
The USB interface is used to present the PQF-Manager as a serial interface on its USB
port.
The computer is connected through a USB-A male to USB-Mini B male.
Caution: The USB connection to the PQF-Manager is not isolated. It is mandatory to
connect the protective EARTH connection when using the USB.
138 The PQF-Manager user interface  Manual Power Quality Filter PQFS