Emerson Network Router Manuel D’Utilisation

66

®

 II Software for Micro Motion

®

 Transmitters

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 

 menu, select 

.

a.

To use the external pressure data, ensure that the 

 check box is checked.

b.

To use the external temperature data, ensure that the 

 check 

box is checked.

c.

Click 

.

2. Ensure that the 

 box in the 

 tab has not been set. The 

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

3. Click the 

tab in the 

 panel.

4. For Polled Variable 1:

a.

Click the arrow in the 

box, and select a HART polling method from the 

list. Choose 

 if the external device might be accessed by another 

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

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

primary master.

b.

Click 

. Polling parameters are now displayed for configuration.

c.

In the 

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

d. Click the arrow in the 

box, and select a process variable.

e.

Click 

.

f.

The value displayed in the 

 textbox is the value received from the external 

device. Verify the value.

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