Section 3 Run-time Operation DI801/DI802/DI803/DI810/DI811/DI814/DI818/DI820/DI821/
3BSE027630-600 B 115
If an instrument does not reply the DISAPPEARED and SEARCHING bits
related to that instrument are set. Then the module begins to scan that
instrument with HART command 0.
If there is a reply to command 0, the module verifies if it comes from the
original instrument:
– if it does, the APPEARED bit is set, the DISAPPEARED and
SEARCHING bits are cleared and the module restarts the normal
scanning activity;
– if it does not, the MISMATCHED bit is set, the DISAPPEARED bit is
cleared and the module keeps on searching the instrument with
command 0.
With a new diagnosis scan, the DISAPPEARED and APPEARED bits are
cleared.
DI801/DI802/DI803/DI810/DI811/DI814/DI818/DI820/DI821/
DI828/DI890
About DTM
See About DTM on page 39.
Identification
See Identification on page 40.
Dynamic Data
See DI801/DI810/DI811/DI814/DI828/DI840 Dynamic values on page 156, DI818
Dynamic values on page 157 and DI802/DI803/DI820/DI821/DI890 Dynamic
values on page 159.
Diagnosis
See Diagnosis on page 41.
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