Automatically Connect To A Hart Device; Connect - Select Screen - Emerson AMS Trex User Manual

Field Communicator application
Note
For HART devices, the Field Communicator application can automatically detect and connect to the
device if the Auto-Connect option in the Trex Settings is enabled. If this option is enabled, the device
menu is displayed rather than the Device List.
3.4.1

Automatically connect to a HART device

The Field Communicator application can automatically detect and connect to a HART
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, connects to the device and displays
the device menu.
To use the auto-connect feature, ensure the Auto-Connect option is enabled (Settings > Field
Communicator App Settings > Auto-Connect), and the Trex unit is connected to one of the
following:
•
•
•
If the Trex unit cannot automatically connect to the device, tap HART on the Connect -
Select screen and follow the prompts from the device connection wizard to connect to the
device.
Note
You can disable the Field Communicator application from automatically connecting to a device at
address zero. If you disable this option, the Trex unit still detects the device at address zero, but you
need to select the device on the Device List to connect and view the device screens. You may also
want to disable this option if the Trex unit is connected to a transmitter at address zero with a THUM
adapter.
3.5

Connect - Select screen

If the Trex unit cannot automatically detect or connect to the device when you open the
Field Communicator application, the Connect - Select screen is displayed. The Connect -
Select screen is the home screen for the Field Communicator application.
You can do the following on the Connect - Select screen:
•
•
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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.
Connect the lead set to the Trex unit and to the device to try to automatically
detect/connect to the device. If the device meets the criteria for automatically
connecting, the Trex unit tries to connect to the device.
Tap HART or Fieldbus to start the device connection wizard and connect to the device.
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