Polling Options For Hart Devices; Set The Polling Options For Hart Devices - Emerson AMS Trex User Manual

Field Communicator application
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3.17

Polling options for HART devices

The Field Communicator application uses the HART polling options to search for
connected devices. By default, the Trex unit searches for a device at address zero and
automatically connects to the device, if it is detected. Most HART device installations
contain one device per HART loop and the device address is zero. Multidrop mode is
enabled by changing the address from zero to any address between 1 and 63. See the
device documentation for more information about changing a device address.
If the Trex unit cannot find the device at address zero, the device connection wizard
displays a message asking if you want to change the polling option.
The Trex unit can poll by:
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Note
If the Trex unit polls addresses greater than 15 on a loop with HART Universal Revision 5 devices,
those devices may appear at multiple addresses.
Note
If you have two devices on a HART loop and one device is at address zero, disable the Auto-Connect
option in the Trex Settings. Otherwise, the Trex unit automatically connects to the device at address
zero and does not detect the second device.
3.17.1

Set the polling options for HART devices

When you connect to a device, the Trex unit by default automatically polls address zero
and connects to the device at that address. If the Trex unit does not find a device at
address zero, you are prompted to change the polling address in the device connection
wizard.
If you change the polling option, the selected option is not saved. You need to select the
desired option each time you connect to a device.
Note
If you have two devices on a HART loop and one device is at address zero, disable the Auto-Connect
option in the Trex Settings. Otherwise, the Trex unit automatically connects to the device at address
zero and does not detect the second device.
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Tap Menu > Favorites.
Press and hold a menu item displayed in the Favorites list.
Tap Remove From Favorites.
Address - Select an address (0-63).
Tag - Enter the tag of the device.
Long Tag - Enter the long tag of the device.
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