Connect To An Externally-Powered Hart Device - Emerson AMS Trex User Manual

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Related information
3.13

Connect to an externally-powered HART device

By default, the Trex unit tries to automatically connect to the device at address zero. See
Section 3.4.1
CAUTION!
Remove the USB cable from the Trex unit before connecting to a device.
Note
The Trex unit acts as a secondary HART master on a HART loop.
Procedure
1.
User Guide
Figure 3-31: THUM adapter wiring with 250 Ohm resistor
In the Field Communicator application, tap HART.
Tap Yes when prompted if you want the Trex unit to power the device.
Tap Positioner.
When prompted, change the polling address to 63.
Follow any additional prompts to connect to the THUM adapter.
The device menu is displayed.
HART communication terminals
Wiring diagrams for the Smart Wireless THUM
application
Disconnect a device
for more information.
Connect the lead set to the HART terminals on the Trex unit and to the
communication terminals on the device. See the HART wiring diagrams topic for the
connection details.
If you want to use the Trex internal resistor, connect the Trex unit is series with the
device.
Field Communicator application
™
Adapter and the Field Communicator
81