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1770-KF2 Data Highway or Highway Plus Interface Module
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Asynchronous Link Protocols
Chapter 4
4-16
Figure 4.8
Receiver
for Full-Duplex Protocol
Ye
s
No
No
Ye
s
Ye
s
No
1
1699
RCVE
LAST
= NAK
Receive
DLE
ENQ
?
Receive
Message
?
BCC/CRC
OK
?
LAST = ACK
LAST = NAK
Send DLE LAST
1
...
...
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