7-2 8 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE
CAUSE OF TRANSMISSION CHAPTER 7: IEC 60870-5-103
Table 7-1: Cause of Transmission in the Monitor Direction
Table 7-2: Cause of Transmission in the Control Direction
Value Description
<1> Spontaneous
<2> Cyclic
<3> Reset frame count bit (FCB)
<4> Reset communications unit (CU)
<5> Start/Restart
<6> Power on
<8> Time synchronization
<9> General interrogation
<10> Termination of general interrogation
<20> Positive ack of command
<21> Nack of command
Value Description
<8> Time synchronization
<9> Initiation of general interrogation
<20> Gen e r al c o m m an d
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