Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Manuale Utente Pagina 37

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2–8 Understanding DF1 Protocol
Publication
17706.5.16 - October 1996
Table 2.D
Fullduplex Transmission Symbols
Symbol
Type Meaning
DLE STX control symbol
Sender symbol that indicates the start of a message
frame.
DLE ETX
BCC/CRC
control symbol Sender symbol that terminates a message frame.
DLE ACK control symbol
Response symbol which signals that a message
frame has been successfully received.
DLE NAK control symbol
Response symbol which signals that a message
frame was not received successfully.
DLE ENQ control symbol
Sender symbol that requests retransmission of a
response symbol from the receiver.
APP DATA data symbol
Single character data values between 000F and
11FF. Includes data from application layer including
user programs and common application routines.
A data 10
16
is sent as 10 10 (DLE DLE).
DLE DLE data symbol Represents the data value of 10
16
.
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