Rockwell Automation 1770-HT8 SMART TRANSMITTER - Manual (Page 71)

Communicating with the Smart
Transmitter Interface
Chapter 4
Communicating with the Smart Transmitter
Interface
4-6
Figure 4.3
HART Poll Packets Ć Smart Transmitter Interface to HART Field Device (Short Frame
Format)
90069
Hart Command
Short Frame HART Address
HART Delimiter
Preamble
Byte Count
Data
Check Byte
Slave Address Bits
Logical Address Bits
Master Address Bit
0 Secondary Master
1 Primary Master
Frame Type
010 STX Frame
Reserved
Long/Short Frame Bit
0 Short
1 Long
0 0 0 0 0
0
Figure 4.4
HART Poll Packets Ć Smart Transmitter Interface to HART Field Device (Long Frame
Format)
90070
HART Command
Long Frame HART Address
HART Delimiter
Preamble
Byte Count
Data
Check Byte
Higher Order
Slave Address Bits
Master Address Bit
0 Secondary Master
1 Primary Master
Frame Type
010 STX Frame
Reserved
Long/Short Frame Bit
0 Short
1 Long
1 0 0 0 0
0