Option Description Setup
Digital communica-
tions
A host writes temperature data
to the meter at appropriate in-
tervals. This data will be availa-
ble in addition to the internal
RTD temperature data.
a. Set Line Temperature Source to Fixed Value or Digital Communica-
tions.
b. Click Apply.
c. Perform the necessary host programming and communica-
tions setup to write temperature data to the meter at appro-
priate 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 de-
vice for pressure data.
a. Set Line 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.
d. Set External Device Tag to the HART tag of the temperature
device.
Digital communica-
tions
A host writes pressure data to
the meter at appropriate inter-
vals.
a. Set Line Pressure Source to Fixed Value or Digital Communications.
b. Perform the necessary host programming and communica-
tions setup to write pressure data to the meter at appropri-
ate 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.
• For digital communications:
- Verify that the host has access to the required data.
- Verify that the host is writing to the correct register in memory, using the correct data
type.
• If necessary, apply an offset.
Configure process measurement
Configuration and Use Manual 39
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