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HART functionality
Figure 3-5. Connecting with a 250 Ohm resistor
HART device
–
+
To temporarily install the optional 250 ohm load resistor:
1.Insert the load resistor into the lead set jacks.
2.Open the loop to allow connection of the resistor in series in the loop.
3.Close the loop using the lead set connectors.
Figure 3-6 shows how to connect the 475 Field Communicator directly
to the communication terminals on a wireless device.
Figure 3-6. Connecting to a wireless device
Wireless device
+
Power
supply
–
Optional
250-Ohm load
resistor
Battery
Communication terminals
47
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