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Precision Loop Calibrator
HART Device Communication
21
Communications Setup and Selection
For all Main screen operation modes, except mA Measure with
24V or Volts Measure, the operation mode is set to mA Measure
when you enter the HART Comm. Menu.
The operation mode remains the same as the main screen when it
is Measure with 24V. If Volts Measure was selected from the
Main menu, the menu defaults to communicator mode only and
the 250 Ω resistor selection shows n/a.
The 250 Ω resistor selection cannot be edited in communicator
mode.
The mode and resistor will change from the last selections made in
the HART Comm. Menu when you exit the menu.
The mode and 250 Ω resistor settings must correspond to how the
test leads are connected before you connect. See Figure 23.
Figure 23. HART Comm. Menu Screen
Select a function from the menu and push the selection knob to do
the function. Push to disconnect from HART mode and go to
the function home screen without action.
An error shows and no action is taken if the measured input is out
of range, OL or -OL.
250Ω Resistor and HART CONNECT functions are described in
subsequent sections.
Mode
The Mode function from the HART. Comm. Menu lets you select
what mode to work in. See Figure 24.
Figure 24. Mode Selection Screen
Use the selection knob to choose the mode:
mA Measure- The Product is in circuit and loop power is
supplied externally.
mA Measure with 24V- The Product is in circuit and the loop
power is supplied by the Product.
Communicator Only- The Product is across the circuit and
the loop power is supplied externally. The 250 Ω resistor
selection defaults to n/a (not applicable).
mA Src HART Valve- to source mA signals and communicate
HART to connect and communicate with control valves.
mA Sim HART Valve- to simulate mA signals and
communicate HART to connect and communicate with control
valves with control system 24 V loop power.
27


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