3-5
Section 3 Operation
Models MT 3809 and 3819
Installation and Operation Manual
X-VA-MT3809-3819-eng
Part Number: 541B049AHG
September, 2008
Figure 3-3 HART Communicator
The HART Communicator is the hand-held interface that provides a
common communication link to all HART compatible, microprocessor-
based devices. A keypad, liquid crystal display (LCD) and software menu
structure make up the HART communicator user interface. The Emerson
Model 275 is easy to use. Just press a few buttons to become familiar with
the Action Keys and menu structure.
Typical Connection Emerson Model 275 Communicator Interface
The HART Communicator interfaces with any HART instrument from any
wiring termination point in a 4-20 mA loop, provided a minimum load
resistance of 250 ohms is present between the HART Communicator and
power supply. A minimum load resistance of 250 ohms must be present
between the HART Communicator and power supply in order for the HART
Communicator to communicate with any HART compatible instrument. (An
optional rugged 250 ohm resistor that attaches to the lead set is available
from Emerson. The resistor must be installed in series,
not in parallel.)
Figure 3-4 Typical HART Communicator Interface
Function Keys
Function Keys
Alpha-Numeric Keypad
Alpha-Numeric Keypad
Action Keys
Action Keys
Shift Keys
Shift Keys
LCD
LCD
HART Communicator
8
9
4
5
6
1
2
3
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7
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F1
F2
F3
F4
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250 Ohm
Resistance Minimal
HART-Compatible
Device
F1 F2 F3 F4
HART Communicator
DVC:FCV101B
Fisher Dig Vlv Ctrl
2 Analog In 12.13 mA
3 T ravel 50.36 %
4 Dr ive Sgl 31.54 %
5 Instrument Status
7
89
456
32
1
0.
-
A B C D E F G H I
J K L M N O P Q R
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V W X Y Z
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>
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1 Main
+
_
Power
Supply
+
_
_
Receiver
(DCS/PLCl etc.)
+
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