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Instruction Manual
IM-106-880C, OI
September 2009
Hazardous Area OCX 8800
6-2
Figure 6-1. 375 Communicator Connections - HART
Connecting to a Fieldbus Segment
Connect 375 Field Communicator with the supplied lead set in parallel with
the device to a Fieldbus segment, Figure 6-2. The 375 Field Communicator
Fieldbus connections are polarity sensitive, an error message displays if the
device is connected incorrectly.
OFF-LINE AND ON-LINE
OPERATIONS
The Field Communicator can be operated both off-line and on-line. Off-line
operations are those in which the communicator is not connected to the Haz-
ardous Area OCX 8800. Off-line operations can include interfacing the Field
Communicator with a PC (refer to applicable Field Communicator documenta-
tion regarding Model 375/PC applications). In the on-line mode the communi-
cator is connected to a fieldbus terminal block.
NOTE
If the Field Communicator is turned on while connected to the fieldbus
terminal block, an undefined status indication appears while the
communicator warms up. Wait until the warm-up period ends to continue.
The opening menu displayed on the LCD is different for on-line and off-line
operations. When powering up a disconnected (off-line) communicator the
LCD will display the Main Menu. When powering up a connected (on-line)
communicator the LCD will display the On-line Menu. Refer to the Field
Communicator manual for detailed menu information.
Loop
Connectors
O 4-20 mA Signal Line
2
Field
Communicator
Model 375
RL 250W
Analog Output Device
Field Communicator
Rear Panel
Lead Set
38850006
4-20 mA Terminal Block in
Electronics Housing
³
A OUT 1 -
A OUT 1 +
1
Explosions can result in death or serious injury. Do not make connections to the Field
Communicator's serial port, digital signal line, or NiCad recharger jack in an explosive
atmosphere.