Connect to an externally-powered positioner in-seriesFigure 4-8:
The Trex unit controls current from the HART terminals.
A. Voltage source
Control current to simulate a transmitter on an externally-powered loopFigure 4-9:
The Trex unit controls current from the HART terminals, which simulates a transmitter. The Trex unit
controls current the same way as a transmitter controls current. The Trex unit is connected to the analog
input (AI) channel.
You can connect the Trex unit at various points on the current loop, including a junction box, device
connection point, etc.
A. Analog input
Loop Diagnostics application
User Guide 133
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