ABB UNITROL 1020 - Page 164

Chapter 6 - Operation 
156 3BHS335648 E82 UNITROL 1020 User Manual
Communication \ MODBUS Supervision \
Monitoring
Do not use the ID displayed here
Please be aware that this number will be automatically
adjusted according the AVR-ID number and the Channel
Indentification (Main / Redundant)
Communication \ MODBUS Supervision \
Channel Setup