4ć30 – Rockwell Automation 1770-HT8 SMART TRANSMITTER User Manual
Page 95
Communicating with the Smart
Transmitter Interface
Chapter 4
Communicating with the Smart Transmitter
Interface
4-30
Table 4.O
Example BTR Data Offset at D9:40 Ć Short Frame Format for HART Command 0
Address
0
1
2
3
4
5
6
7
8
9
D9:40
0110
8000
8006
0E00
0000
26FE
060D
0205
5001
0000
D9:50
1115
0009
Short Frame Word Contents Ć Smart Transmitter Interface to
Programmable Controller (Offset at D9:40)
Word 00: Smart Transmitter Interface command is hexadecimal 10 (low
byte); Smart Transmitter Interface channel is hexadecimal 01 (high
byte).
Word 01: Smart Transmitter Interface error code is hexadecimal 00
indicating no errors (low byte); Smart Transmitter Interface status is
hexadecimal 80 indicating the Smart Transmitter Interface has been
reset (high byte).
Word 02: HART delimiter is hexadecimal 06 indicating an ACK frame
with a short frame address (low byte); HART short frame address is
hexadecimal 80 indicating primary master, burst mode disabled, logical
and slave address of 0 (high byte).
Word 03: HART command is hexadecimal 00 (low byte); HART packet
byte count is hexadecimal 0E indicating 14 bytes of data between this
byte count and the check byte (high byte).
Word 04: first byte of HART response code is hexadecimal 00
indicating no communications errors (low byte); second byte of HART
response code is hexadecimal 00 indicating no device errors (high byte).
Word 05: Hexadecimal FE (low byte); Manufacturer’s Identification
code hexadecimal 26 for Rosemount (high byte).
Word 06: Manufacturer’s device type code is hexadecimal 0D for a
3044C temperature transmitter (low byte); minimum number of
preambles required by the device is hexadecimal 06 (high byte).
Word 07: Revision Level of the Universal Command Document
implemented in this device is hexadecimal 05 (low byte); revision level
of the Transmitter-Specific Document implemented in this device is
hexadecimal 02 (high byte).
Word 08: Software revision level of this device is hexadecimal 01 (low
byte); hardware revision level of this device is hexadecimal 50 (high
byte).