6 Field Communicator
6.1 Overview
The 375 Field Communicator is a communication interface device. It supports HART and
Fieldbus devices, letting you configure and troubleshoot in the field.
The 375 Field Communicator includes an LCD with touch-screen display and keypad. Use
the touch-screen or keypad to enter data into the 375 Field Communicator.
Three terminals for the lead are on the top of the 375 Field Communicator. The lead set
and terminals let you connect the 375 Field Communicator to a device. An access door
ensures only one pair of terminals can be used at any time. Several markings indicate
which pair of terminals is for which protocol. F indicates the Fieldbus protocol, while H
indicates the HART protocol.
The infrared port (IrDA) lets the 375 Field Communicator interface with the PC. IrDA is a PC
interface supported for transfer of device descriptions (DD), software updates,
configurations, and application licenses. IrDA communications can either be built into the
PC or provided through a USB to IrDA adapter. The PC application can either be AMS Suite
or 375 Easy Upgrade Programming Utility. The 375 must be in the Listen for PC mode when
communicating through IrDA.
Refer to the 375 Field Communicator User Manual for details.
6.2
Field Communicator connections
6.2.1 Connecting to a HART loop
Connect the 375 Field Communicator with the supplied lead set in parallel with the device
or load resistor, Figure 6-1. The HART connections are not polarity sensitive. A minimum
250 ohms resistance must be present in the HART loop for the 375 Field Communicator to
function properly.
WARNING!
EXPLOSION
Do not make connections to the Field Communicator's serial port, digital signal line, or NiCad
recharger jack in an explosive atmosphere. Explosions can result in death or serious injury.
Field Communicator
Reference Manual 83
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