Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Manual de usuario Pagina 73

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Chapter 5
Publication
17706.5.16 - October 1996
Datalink Layer Message
Frames
In the data-link layer of a message frame:
half-duplex protocol uses three types of message transmission
full-duplex protocol implements its message fields at different
network layers
at the end of each polling and message frame, there is a one-byte
BCC field or a two-byte CRC field
Read this chapter to help learn the fields that your computer uses in
the data-link layer of a message frame. It contains these sections:
Section Page
Halfduplex Protocol Message Frames 5-2
Fullduplex Protocol Message Frames 5-3
BCC and CRC Fields
5-4
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