• Power and connect to a HART positioner, if the Trex unit has the Device
Communicator Plus communication module.
• Power and connect to the Smart Wireless THUM
™
Adapter, if the Trex unit has the
Device Communicator Plus communication module.
• Power and connect to a FOUNDATION fieldbus device, if the Trex unit has the Device
Communicator Plus communication module. The Trex unit provides power, power
conditioning, and two terminators.
• Connect to an externally-powered HART or FOUNDATION fieldbus device.
• Use the internal resistors in the Trex unit when connecting to an externally-powered
HART transmitter. The internal resistors in the Trex unit temporarily convert an
externally-powered 4-20 mA current loop into a HART loop.
• Save menu items from HART devices to a list of favorites for quick access.
• Simulate a HART or FOUNDATION fieldbus device.
Note
The Field Communicator application can be used with the Device Communicator communication
module or Device Communicator Plus communication module. However, the Trex unit cannot
power a HART or FOUNDATION fieldbus device with the Device Communicator communication
module.
3.1 Open or close the Field Communicator
application
1. To open the application, tap the Field Communicator icon on the Trex Home screen.
The Auto-Detect screen is displayed while the Field Communicator application tries
to detect a connected device. If you tap Cancel on the Auto-Detect screen, the Field
Communicator application stops checking for devices and displays the Connect -
Select screen.
2. To close the application, tap Exit if the Connect - Select screen is displayed.
Otherwise, tap Back until that screen is displayed.
3.2 Device interoperability
The Trex unit communicates with many HART and FOUNDATION fieldbus devices
independent of device manufacturer by using Electronic Device Description Language
(EDDL) technology.
Basic testing is performed on all device descriptions. New device descriptions are available
from the Upgrade Studio application or the resource DVD.
Field Communicator application
46 User Guide
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