Emerson AMS Trex Device Communicator User Manual page 54

Field Communicator application
September 2021
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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.
Forward Compatibility rules for saving and
sending configurations to AMS Trex
Note
Do not edit configurations on the AMS Trex unit while connected to Configuration
Management.
You can edit offline configurations on the Trex unit according to forward compatibility
rules:
• To edit a configuration with Trex, you must have the proper device description installed
on Trex. The installed device description must match the device type and device
revision of the configuration. If the configuration does not exactly match the device
description on the Trex unit, you cannot save the configuration.
• To send a configuration to a device, you must have the proper device description
installed on Trex. The installed device description must be for the same device type,
and equal to or greater than the device rev of the configuration.
• You cannot save or send configurations when using the generic device description.
Automatically detect a device
The Field Communicator application can automatically detect a device, without requiring
any input from you. When you open the Field Communicator application or when the
Connect - Select screen is displayed, the Trex unit checks for the most common
connection scenarios and, if possible, detects the connected device and displays the
Device List. You can then select a device and display its device menu. The auto-detect
feature lets you skip the device connection wizard in the Field Communicator application,
which allows for faster connections to devices.
The Field Communicator application can automatically detect:
• A HART device that is on an externally-powered compliant HART loop, and the device is
communicating at address zero.
• A 4-wire HART device that is communicating at address zero. (This may require a
resistor across the HART terminals. Check the device documentation for the proper
connection.)
• A WirelessHART device that is powered by its battery, and the device is communicating
at address zero.
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