Honeywell XNX-UTAI Series User Manual

XNX Universal Transmitter
Installation and Operation
56
Options
Local HART Interface
Available with any sensor technology or option, this option
provides an external access to the HART interface in
the transmitter. An intrinsically safe (IS) barrier inside the
transmitter allows the user to attach an external handheld eld
communicator for programming and conguration. The external
interface is installed in the lower left cable/conduit port of the
transmitter and is intrinsically safe.
Figure 54. XNX Universal Transmitter with HART interface IS barrier installed
The HART protocol is a communication technology used
with smart process instrumentation, providing two-way
communication simultaneously with the 4-20mA analog signaling
used by traditional instrumentation equipment. For more detailed
information on HART, see the the HART Protocol section and
www.fieldcommgroup.org.
Implementation of the HART protocol in the transmitter:
• Meets HART 6.0 physical layer specication
• The physical layer is tested according to HART Physical
Layer Test Procedure, HCF_TEST-2.
• Data transfer rate: 1200 bps.
HART devices can operate in point-to-point or multidrop
congurations.
Caution: Device address changes must be performed only by qualified service
personnel
CAUTION
!
Point-to-Point Mode
In point-to-point mode, the 4–20 mA signal is used to
communicate one process variable, while additional process
variables, conguration parameters, and other device data are
transferred via HART protocol, as shown in the illustration below.
The 4–20 mA analog signal is not affected by the HART signal.
Control System
or Other Host Application
Multiplexer
Barrier
Handheld Terminal
Field Device
Note: Instrument power is provided by an interface
or external power source that is not shown.
Figure 55. Point-to-point mode of operation

Honeywell XNX-UTAI Series Specifications

General

Brand	Honeywell
Model	XNX-UTAI Series
Category	Transmitter
Language	English