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744
HART Mode Users Guide
12
Service Operations
The Service softkey provides access to Loop Test,
Pressure Zero Trim (where applicable), Output Trim, and
Sensor Trim operations. For generic transmitters, only
Loop Test, Output Trim, and Pressure Zero Trim are
available. (See Table 1.) The trim (adjustment)
operations are described later in this manual.
Note
Loop Test and Output Trim are not available if
the transmitter is in multidrop mode.
Abort Softkey
The Abort softkey terminates the communication
operation underway, and returns control to the previous
screen. From the Active Device screen,
Abort calls up the
browser, in which you can view the list of supported
transmitters.
Interaction between Analog Mode and
HART Mode
Analog mode is normal calibrator operation, as described
in the
744 Users Manual
. HART mode is activated when
you press the r (HART) key. This action starts
communication over the HART interface.
You can switch between HART and analog modes easily
by pressing r (or pressing M to go to analog mode
from HART mode), gaining the benefit of having the
transmitter automatically,set up analog mode for
appropriate measure and source functions, if desired.
For supported transmitters, the transition to analog mode
goes to the MEASURE/SOURCE screen, which provides
an easy way to proceed with an “as found” calibration.
For generic transmitters, the transition to analog mode
involves choosing the MEASURE or SOURCE screen,
from which you select the appropriate function.
For supported or generic transmitters, when you press
r to return to HART mode, the Active Device screen is
displayed. The HART serial communication connection
remains active as you switch between HART and analog
modes.