Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command - Manual (Page 37)

2–8 Understanding DF1 Protocol
Publication 1770Ć6.5.16 - October 1996
Table 2.D
FullĆduplex 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 00Ć0F and
11ĆFF. 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
.