Ams trex™ Device Communicator

Power Status Message
Description
Voltage Detected on HART
Typical status for connecting across HART device's
communication terminals when the device is on an externally-
powered loop.
The detected voltage is greater than or equal to 8 volts.
Field Communicator application
User Guide
September 2021
58
User Guide

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Power Status Message
Description
Voltage Detected on HART+
pwr
The detected voltage is greater than or equal to 8 volts.
Low Voltage Detected on HART Typical status for connecting:
•
To a 4-wire HART device
•
To a 
Wireless
HART device
•
Across a resistor
•
Across HART control system modules
The detected voltage is between 0.5 and 8 volts.
Note
You may see this status when the AC adapter is attached to the
Trex unit. If low voltage is detected, disconnect the AC adapter.
Note
This message can also appear if the Trex unit connects to a
device that was recently powered. Some devices may hold
voltage for several minutes after being disconnected from its
power supply. The Trex unit provides a warning message that it
detects voltage.
If you try to power a device when this occurs, the Trex unit asks if
you want to ignore the voltage warning and proceed with
sourcing power. If you select Yes, the Trex unit powers the
device.
Low Voltage Detected on HART
+ pwr
The detected voltage is between 0.5 and 8 volts.
No Voltage Detected
Typical status for connecting:
•
An unpowered device.
•
To some types of 4-wire HART devices.
•
To some types of 
Wireless
HART devices.
This status is also displayed when the lead set is not connected to
a device, or when the Trex unit is connecting to a device.
Voltage Detected on FF
Typical status for connecting to an externally-powered fieldbus
segment.
The detected voltage is greater than or equal to 8 volts.
Low Voltage Detected on FF
The measured voltage is less than 8 volts.
Voltage Provided from FF pwr
The typical status when the Trex unit is powering the
FOUNDATION fieldbus device. The detected voltage is greater
than or equal to 8 volts.
Voltage Provided from HART+
pwr
The typical status when the Trex unit is powering the HART
device. The detected voltage is greater than or equal to 8 volts.
User Guide 
Field Communicator application
September 2021
User Guide 
59

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