Emerson AMS Trex User Manual page 75

Figure 3-15:
If you have a 250 Ohm resistor, you can insert it in between the device terminals and connect the lead set
across the resistor. Otherwise, you can enable the internal resistor in the device connection wizard.
Note
Ensure you review the device documentation for connecting/setting up HART communication. Devices
may have different terminals or requirements.
A.
Device connection wizard prompts
Do you intend to provide power from the
Trex unit?
Leads are attached to:
Change Polling Option?
Increase loop resistance?
Figure 3-16:
User Guide
Connect to a 4-wire HART transmitter
Voltage source
Power and connect to a HART positioner
Field Communicator application
Answer
No
Transmitter
Tap Yes if the device is not at address zero.
Tap Yes if there is no external resistor between the
device terminals.
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