Emerson AMS Trex - Internal Resistors

HART Device ListFigure 3-23:
3.11 Internal resistors
The Trex unit has internal resistors that can be used when the Trex unit powers a HART
transmitter, or when the HART transmitter is on a 4-20 mA current loop without a resistor.
The resistors are enabled through the device connection wizard in the Field Communicator
application.
Note
For positioners, the internal resistors in the Trex unit are disabled.
Field Communicator application
74 User Guide