Instruction Manual
Appendix JX Rev. 1.0
January 1997
Rosemount Analytical Inc. A Division of Emerson Process Management Appendices J-1
World Class 3000
APPENDIX JX, REV. 1.0
HART COMMUNICATOR MODEL 275D9E
IFT 3000 APPICATIONS
DESCRIPTION
See Safety Data Sheet 1M03296 for
safety related information.
J-1 COMPONENT CHECKLIST OF TYPICAL
HART
®
COMMUNICATOR PACKAGE
A typical Model 275D9E HART
®
Communicator
package should contain the items shown in
Figure J-1, with the possible exception of
options. If a rechargeable NiCad battery pack
has been selected, at least one spare battery
pack (per HART Communicator) is recom-
mended.
J-2 UNIT OVERVIEW.
a. Scope
This Instruction Bulletin supplies details
needed to install and operate the HART®
Communicator in relation to the World Class
3000 Intelligent Field Transmitter. Informa-
tion on troubleshooting the communicator is
also included.
b. Device Description
The HART (Highway Addressable Remote
Transducer) Communicator is a hand-held
communications interface device. It pro-
vides a common communications link to all
microprocessor-based instruments which
are HART compatible. The hand-held com-
municator contains an 8 x 21 character liq-
uid crystal display and 25 keys. A pocket-
sized manual, included with the HART
Communicator, details the specific functions
of all keys.
To interface with the IFT 3000, the HART
Communicator requires a termination point
along the 4-20 mA current loop, and a
minimum load resistance of 250 ohms be-
tween the communicator and the power
supply. The HART Communicator accom-
plishes its task by use of a frequency shift
keying (FSK) technique. With the use of
FSK, high-frequency digital communication
signals are superimposed on the 4-20 mA
transmitter current loop. The communicator
does not disturb the 4-20 mA signal, since
no net energy is added to the loop.
The HART Communicator may be inter-
faced with a personal computer, providing
special software has been installed. To
connect the HART Communicator to a PC,
an interface adaptor is required. Refer to
the proper HART Communicator documen-
tation in regard to the PC interface option.
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