5 - data-link layer message frames, Dataćlink layer message frames, Chapter – Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command User Manual
Page 73
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Chapter
5
Publication 1770Ć6.5.16 - October 1996
DataĆlink 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
HalfĆduplex Protocol Message Frames
FullĆduplex Protocol Message Frames
BCC and CRC Fields
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