Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Manuel d'utilisateur Page 64

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4–10 Using Full-duplex Protocol to Send and Receive Messages
Publication
17706.5.16 - October 1996
These transfer diagrams show events that occur on various
interfaces. Time is represented as increasing from the top of the
diagram to the bottom. Link-layer data bytes are represented by
“xxxx” and corrupted data by “???”.
For this diagram See page
normal message transfer 4-10
message transfer with NAK 4-11
message transfer with timeout & ENQ 4-12
message transfer with retransmission 4-13
message transfer with message sink full 4-14
message transfer with NAK on reply 4-15
message transfer with timeout and ENQ for the reply 4-16
message transfer with message source full on the reply
4-17
Normal Message Transfer
In this transfer:
the transmitter sends the data to the receiver
the sink sends a “not full” message
the receiver sends the data to the sink and sends a DLE ACK to
the transmitter
the transmitter tells the source that the data was delivered
reply is successfully returned
xxxx
not full
OK
OK
xxxx
not full
xxxx
DLE STX xxxx DLE ETX BCC/CRC
DLE ACK
DLE STX xxxx DLE ETX BCC/CRC
DLE ACK
Source Transmitter Link Receiver Sink
command
reply
(sometime later ...)
Fullduplex Protocol
Diagrams
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