375/475 Field Communicator
In order to communicate with a 375 or 475 Field Communicator, the CSI 9420 device must
be powered by connecting the power module pack, or connecting external 24V DC power.
Also, the initial boot and acquisition cycle must be complete (This is indicated when the LCD
screen goes blank after a number of messages are displayed). If no LCD is installed, or if
the LCD is disabled, wait about 30 seconds after powering the device before attempting to
communicate on the wired interface.
To use the 375/475 Field Communicator with the rev 3 CSI 9420, a rev 3 DD (Device
Description file) is required. The rev 3 DD for the CSI 9420 is located on the CD that is
shipped with the CSI 9420. 375/475 System Software version 3.2 or later is also required.
Refer to Figure 6 for an illustration of connecting the 375/475 to the CSI 9420. The wired
HART connection is located on the terminal block in the rear chamber of the device. It is a
two-wire, polarity-independent connection. In the battery powered version, it is the bottom
two terminals, labeled “COMM”. In the externally powered version, it is the top two screws
on the right.
NOTE
Refer to the 375/475 Users’ Manual for details on DD’s or go to
www.fieldcommunicator.com/syssoftdds.htm for instructions on adding a DD for the
CSI 9420 or other new devices.
Figure 6. 375 Field Communicator Connections (battery powered version)
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