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Endura ACA592
Toroidal conductivity transmitter
9 HART Communication
72
OI/ACA592/TC–EN Rev. B
9 HART Communication
For ease of identification, each HART device features a configurable 8-character HART tag. In addition to
the HART tag, each device has a HART address (set to the default value 0). At this address the device
operates in HART standard communication mode (point-to-point operation).
When an address in the range 1 to 15 is used, the transmitter switches to HART multidrop mode. This
operating mode enables users to connect up to 15 transmitters in parallel to a power supply.
In multidrop mode, an analog output signal that matches the Primary Value is not available. The output
signal in multidrop mode is, basically, a constant 4 mA and is used exclusively for the power supply.
In multidrop mode, sensor or process data information is available as a HART signal only.
In addition to point-to-point and multidrop modes, the third type of HART communication is burst mode.
When
Burst Mode
is activated, the transmitter transmits a HART telegram containing process information
continuously, (approximately every 500 ms) without prompting by a HART command. Refer to the
Communication
level (see page 61) for further details of
Burst Mode
.
9.1 HART Device Type Codes
All HART products contain unique identifiers that specify the device type.
The device type code for ACA592–TC toroidal conductivity transmitter series is: 51 (33 hex).