Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Instrukcja Użytkownika Pobierz pdf (Strona 51)

Asynchronous Link Protocols

Chapter 4

4-8

Figure 4.4 shows Path 1 with unrelated parts of Figure 4.3 removed.

Paths 2, 3, and 4 could be similarly shown.

Figure 4.4

Path

1, Unrelated Parts of Figure 4.3 Removed

Transmitter

Receiver

Path 1 Path 1

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The full-duplex protocol is symmetrical; that is, anything that can be said

about Transmitter A, Receiver B, and Paths 1 and 2 applies equally to

Transmitter B, Receiver A, and Paths 3 and 4. There are actually two

independent instances of the protocol operating simultaneously. For

simplicity the protocol will be defined on the subsystem that carries

messages from A to B, with reference to Figure 4.5.

Figure 4.5

Message

Transmission from A to B

Transmitter

Receiver

Path 2 Path 1 Path 2 Path 1

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Path 1

Path 2

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 234 235

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Rockwell-automation 1770-KF2 Data Highway or Highway Plus Interface Mo Instrukcja Użytkownika Strona 51