Wiring Diagrams For Hart Devices And The Field Communicator Application - Emerson AMS Trex User Manual

Field Communicator application
3.10.2 Wiring diagrams for HART devices and the Field
Communicator application
The Trex unit can communicate with a device from the control room, on the bench, or any
wiring termination point in the loop. Connect the lead set to the Trex unit and to the
communication terminals on the device or across the resistor.
Below each diagram, a table lists the expected prompts from the device connection wizard
and the answers to complete the connection. The prompts appear only if the Field
Communicator application could not automatically detect or connect to the device.
Note
The Trex unit acts as a secondary HART master on a HART loop.
CAUTION!
Remove the USB cable from the Trex unit before connecting to a device.
Figure 3-11:
Note
When the Trex unit powers the HART transmitter, an external resistor is not needed. The Trex unit uses an
internal resistor that is automatically used when you enable the Trex unit to power the transmitter.
Note
Do not insert a resistor in parallel with either the HART+pwr or HART terminals on the Trex unit, or in
parallel with the device's communication terminals. This may prevent communications.
Device connection wizard prompts
Do you intend to provide power from the Trex unit?
Are you providing power to a transmitter or positioner?
Change Polling Option?
64
Power and connect to a 2-wire HART transmitter
Answer
Yes
Transmitter
Tap Yes if the device is not at address
zero.
User Guide