Option Description Setup
Digital
communications
A host writes temperature data
to the meter at appropriate
intervals. This data will be
available in addition to the
internal RTD temperature data.
a. Set Line Temperature Source to Fixed Value or Digital
Communications.
b. Select Apply.
c. Perform the necessary host programming and
communications setup to write temperature data to the
meter at appropriate intervals.
3. Choose the method you will use to supply pressure data, and perform the required setup.
Option Description Setup
Polling The meter polls an external
device for pressure data.
a. Set Pressure Source to Poll for External Value.
b. Set Polling Slot to an available slot.
c. Set Polling Control to Poll as Primary or Poll as Secondary.
Option Description
Poll as Primary No other HART masters will be on the
network. A field communicator is not
a HART master.
Poll as Secondary Other HART masters will be on the
network. A field communicator is not
a HART master.
d. Set External Device Tag to the HART tag of the temperature
device.
Digital
communications
A host writes pressure data
to the meter at appropriate
intervals.
a. Set Pressure Source to Fixed Value or Digital
Communications.
b. Perform the necessary host programming and
communications setup to write pressure data to the meter
at appropriate intervals.
Postrequisites
If you are using external temperature data, verify the external temperature value displayed in the Inputs
group on the ProLink III main window.
The current pressure value is displayed in the External Pressure field. Verify that the value is correct.
Need help?
If the value is not correct:
• Ensure that the external device and the meter are using the same measurement unit.
• For polling:
— Verify the wiring between the meter and the external device.
— Verify the HART
®
tag of the external device.
Configuration and Use Manual Configure process measurement applications
MS-00809-0200-1600 May2024
Configuration and Use Manual 53
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