Modbus Rtu - ABB PQFS Installation, Operation And Maintenance Instructions

Figure 67 Communication unlocked
When the communication lock is "checked" (see Figure 68), any change in the filter
parameter or setting is possible ONLY using a communication link (e.g. Modbus or
TCP/IP based with help of PQ-Link software). In other words, locking the communication
is equivalent to using the hardware lock in the back side of the PQF-Manager.
Figure 68 Communication locked

7.11.4.1 Modbus RTU

The slave address is the one used by the Modbus master to address the PQF through
Modbus.
Baud rate, Parity, Stop bit shall match exactly the communication settings of the
Modbus master which controls the RS485 / Modbus network.
RS485 / Modbus Adapter
Manual Power Quality Filter PQFS  Commissioning instructions 133