744
HART Mode Users Guide
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.
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 Mto 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.
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.
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
rto 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.
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