Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Manual do Utilizador descarregar pdf (Página 37)

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

is sent as 10 10 (DLE DLE).

DLE DLE data symbol Represents the data value of 10

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 250 251

Sem comentários

Rockwell-automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command Manual do Utilizador Página 37