Emerson AMS Trex Device Communicator User Manual page 127

User Guide
User Guide
1.800.561.8187
Figure 4-1: Loop Diagnostics screen at start up
A. Measurement section : Displays the measured voltage and current. The
measurements begin when the Loop Diagnostics screen is displayed, and the
measurements update about once per second. See
in Loop Diagnostics for more information about the terminals used for each
measurement.
B. Power/Help section : Lets you enable/disable the Trex unit to power a transmitter or
positioner. The connection diagram on the right shows the terminals on the Trex unit
where measurements are being read.
By default, the HART and mA terminals are circled in green on the connection diagram.
The diagram shows you one setup for reading voltage on the HART terminals and
current on the mA terminals when Trex Unit Power is off. (This setup lets you take the
measurements without interrupting the 4-20 mA current loop by connecting the Trex
HART terminals to a transmitter's communication terminals and connecting the Trex mA
terminals to a transmitter's test terminals.) The connection diagram is updated based on
the options you select (Trex Unit Power and Trex Unit Current).
www.
Loop Diagnostics application
Voltage and current measurements
information@itm.com
.com
September 2021
127