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HART Functionality
Figure 3-2. HART Communication Terminals and Access Door
Access Door
HART Communication Terminal Markings
NOTE
The lead set must be used to communicate with a wired or wireless device. The 475
Field Communicator cannot communicate wirelessly with devices.
Wiring Diagrams
Figure 3-3 shows how to connect the 475 Field Communicator to a HART loop.
Figure 3-3. Connecting to a HART Loop
HART Device
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-
+
-
Figure 3-4 shows how to connect the 475 Field Communicator directly to the terminals
of a HART device.
Figure 3-4. Connecting Directly to a HART Device
HART Device
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-
+ -
Communication Terminals
RL≥250Ω
-
+
+
Power
mA
Supply
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+
-
Current
Meter
RL≥250Ω
-
+
+
Power
mA
Supply
-
-
+
Current
Meter
+
-
+
-
3-7
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