Emerson AMS Trex User Manual page 141

Figure 4-8:
The Trex unit controls current from the HART terminals.
A.
Figure 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.
User Guide
Connect to an externally-powered positioner in-series
Voltage source
Control current to simulate a transmitter on an externally-powered loop
Analog input
Loop Diagnostics application
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