P92x/EN CT/E11 Technical Guide
Modbus Protocol
Page 4/118 MiCOM P921-P922-P923
6. PROCESSED COMMANDS 116
6.1 System Commands 116
6.2 General Commands (ASDU 20) (Control direction) 116
7. RELAY RE-INITIALIZATION 117
8. CYCLIC MESSAGES (ASDU 9 AND ASDU 77) 117