3 Field Communicator application
The Field Communicator application lets you configure HART and FOUNDATION fieldbus
devices. (The fieldbus functionality requires a license.) You can do the following:
• Power and connect to a HART transmitter, if the Trex unit has the Device
Communicator Plus communication module. The Trex unit has an internal resistor, so
you do not need to add a loop resistor.
• 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
Procedure
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.
User Guide Field Communicator application
September 2021
User Guide 53
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