Glossary
Activation
Activation updates the Trex unit with any needed licenses and enables the full
functionality of the Trex unit. Activation also associates the Trex unit and its attached Trex
modules with a user account/company.
Ammeter
The mA terminals on the Device Communicator Plus communication module that enable
the Trex unit to measure current on a 4-20 mA current loop. The HART + pwr terminals can
also measure current.
Burst mode
A communication mode in a HART transmitter to send data at regular intervals.
Commissioned device
A device that has been set up to communicate with a host system. This usually includes
assigning a permanent address to the device.
Some operations on the Trex unit are disabled for commissioned devices because they
could cause process disruption.
Communication module
A term to refer to either the Device Communicator communication module or the Device
Communicator Plus communication module.
Data Link Time
A network-wide time that is periodically distributed by the LAS to synchronize all device
clocks on the bus.
Device
See HART device or FOUNDATION fieldbus device.
Device Communicator communication module
A communication module you can attach to the Trex unit. This module has terminals that
enable the Trex unit to communicate with HART and FOUNDATION fieldbus devices.
Device Communicator Plus communication module
A communication module you can attach to the Trex unit. This module has terminals that
enable the Trex unit to communicate with HART and FOUNDATION fieldbus devices,
power a HART or FOUNDATION fieldbus device, and measure current on a 4-20 mA
current loop.
Device description (DD)
A set of instructions written in the HART or FOUNDATION fieldbus Device Description
Language that defines the parameters, commands, and methods that a host application
uses to communicate with a HART or FOUNDATION fieldbus device.
Externally-powered device
A HART or FOUNDATION fieldbus device that is powered by a power supply or digital
control system. The Trex unit is not powering the device, loop, or fieldbus segment.
Externally-powered loop
User Guide
Glossary
September 2021
User Guide 193
w ww . . co m
information@itm.com1.800.561.8187
To Next Page
Loading...
