Network Router User Manual

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Table Of Contents

66 ProLink

II Software for Micro Motion

Transmitters

Transmitter Configuration, Characterization, and Calibration

5.8 Configuring polling

Polling is used to retrieve temperature or pressure data from an external device. These data can then

be used for API calculation or other process variable calculations in applications that require pressure

or temperature compensation. You may query one or two external devices.

You must also ensure that the primary mA output has been wired for HART protocol. See Chapter 2

or the installation manual for your transmitter.

To configure polling:

1. From the

View menu, select Preferences.

a. To use the external pressure data, ensure that the

Enable External Pressure

Compensation

check box is checked.

b. To use the external temperature data, ensure that the

Use External Temperature check

box is checked.

c. Click

Apply.

2. Ensure that the

External Temperature box in the Temperature tab has not been set. The

default value is 32.00 °F (0.0000 °C).

3. Click the

Polled Variables tab in the Configuration panel.

4. For Polled Variable 1:

a. Click the arrow in the

Polling Control box, and select a HART polling method from the

list. Choose

Poll DP HART Primary if the external device might be accessed by another

device acting as a secondary master (e.g., a HART Communicator). Choose

Poll DP

HART Secondary

if the external device might be accessed by another device acting as a

primary master.

b. Click

Apply. Polling parameters are now displayed for configuration.

c. In the

External Tag box, type the HART tag of the external device that you will poll.

d. Click the arrow in the

Variable Type box, and select a process variable.

e. Click

Apply.

f. The value displayed in the

Current Value textbox is the value received from the external

device. Verify the value.

5. Repeat these steps for Polled Variable 2, if required.

Note: For some transmitters, the Polling Control selection for Polled Variable 1 is automatically used

for Polled Variable 2. No configuration is required.