Rockwell Automation 1770-HT8 SMART TRANSMITTER - Manual (Page 103)

Communicating with the Smart
Transmitter Interface
Chapter 4
Communicating with the Smart Transmitter
Interface
4-38
Figure 4.14
Example Full Duplex DF1 Command Ć Enable Poll and Response Mode
DLE STX DST SRC CMD STS TNS FNC LEN Smart Transmitter Interface
Packet
DLE ETX BCC
10 02 OF 00 95 04 01 FF 00 00 10 03
Figure 4.15
Half Duplex DF1 Packet sent by a Host Computer to the Smart Transmitter Interface
DLE
90079
SOH STN DLE APPLICATION DATA DLE ETX BCC/CRC
CMD STS TNS FNC
SCMD CHN CTL PRM DATA
LEN DATA
Smart Transmitter
Interface Packet
Data Link
Layer Packet
Since message is from host to Smart Transmitter Interface
DLE = data link escape control character (10" hex)
SOH = start of header control character (01" hex)
STN = Smart Transmitter Interface station address in hexadecimal
STX = start of text control character (02 hex")
DST = Smart Transmittter Interface station address in hexadecimal
SRC = host station address in hexadecimal
CMD = OF" hexadecimal
STS = status byte
TNS = tranxaction number (2 bytes)
FNC = 95" hexadecimal
LEN = length of Smart Transmitter Interface Packet in bytes
SCMD = Smart Transmitter Interface Command
CHN = Smart Transmitter Interface Channel
CTL = Smart Transmitter Interface Control
PRM = Smart Transmitter Interface Parameter
ETX = end of text control character (03" hex)
BCC/CRC = Block Check or CRC bytes
STX DST SRC
Figure 4.16
Example Half Duplex DF1 Command Ć Enable Poll and Response Mode
DLE SOH STN DLE STX DST SRC CMD STS TNS FNC LEN Smart Transmitter
Interface Packet
DLE ETX BCC
10 01 10 02 0F 00 95 04 01 FF 00 00 10 03