Link LayerBalanced Transmission

Master

Slave

Request Message

Response Message

(User Data, Confirm Expected)

(Acknowledgment)

[P]

[P] = Primary Frame

[S] = Secondary Frame

[S]

(User Data, Confirm Expected)

(Acknowledgment)

[P]

[S]

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Slide 14 of 30

DNP only uses balanced transmission

IEC profiles permit either balanced or unbalanced transmission