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HART functionality
WORKING ONLINE WITH
HART DEVICES
Connecting to a HART
device
Field Communicator Easy Upgrade Utility
Use the Easy Upgrade Utility to back up, transfer, and print the
configurations saved in your 475 Field Communicator. See the Easy
Upgrade Utility Help for more information about connecting and
transferring configurations.
The 475 Field Communicator can communicate with a device from the
control room, on the bench, or any wiring termination point in the loop.
Connect the 475 Field Communicator with the appropriate connectors
in parallel with the device or load resistor. The HART connectors are
not polarity sensitive.
A minimum of 250 ohms resistance must be present in the HART loop
for the 475 Field Communicator to function properly. For information
about Intrinsically Safe connections, see Appendix B.
HART communication terminals
Three terminals for the lead set are on the top of the 475 Field
Communicator. Each red terminal is a positive connection for its
protocol. The black terminal is a common terminal shared by both
protocols. An access door ensures only one pair of terminals is
exposed at any one time; see Figure 3-2. Several markings indicate
which pair of terminals is for which protocol.
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.
Communication terminals
45
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