HRT-710 User Manual (Version 1.24, June/2015) PAGE: 18
Figure 17
:
―Multi-drop‖ topology
3.3 HART Frame
The HART frame format is shown as below
:
Figure 18
:
HART frame format
3.3.1 Preamble
All frames transmitted by HART master or slave devices are
preceded by a specified number of "0xFF" characters and they are
called the preamble. The number of preamble can
’t be less than 5 and
more than 20.
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