Emerson AMS Trex Device Communicator User Manual page 15

User Guide
User Guide
1.800.561.8187
Figure 2-5: Device Communicator Plus communication module
A. Power a FOUNDATION fieldbus device. You need to connect the FOUNDATION fieldbus
Power Plug to the FF pwr and the positive FF terminals.
B. Connect to a FOUNDATION fieldbus device that is externally-powered or powered by the
Trex unit.
C. Measure current on a 4-20 mA current loop.
D. Power and connect to a HART device. The HART+pwr terminals can measure the current
output of a connected transmitter or control the current input to a connected positioner.
The terminals also have a loop resistor for device communication.
E. Connect to an externally-powered HART device. The HART terminals also have an
optional loop resistor for enabling HART communications on 4-20 current loop and
optional current control for moving a positioner.
CAUTION
• Before you insert or remove a communication module, ensure the Trex unit is powered
off.
• Ensure sufficient grounding. Ensure the personnel, working surfaces, and packaging
are sufficiently grounded when handling electrostatically sensitive parts.
• Avoid touching the pins on the connectors or components. Discharged energy can
affect the modules.
• When you insert/attach the communication module to the Trex unit, do not over
tighten the screws. Use 0.5Nm maximum torque load.
• Remove the USB cable from the Trex unit before connecting to a device.
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September 2021
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