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Hazardous Area
X-STREAM O
OPERATION VIA
HART/AMS
Field Communicator
Signal Line Connections
(No Xi)
4-10
Transmitter
2
The 375 Field Communicator is a handheld communications interface device.
It provides a common communications link to all microprocessor-based instru-
ments that are HART compatible. The handheld communicator contains a
liquid crystal display (LCD) and 21 keys. A pocket-sized manual, included with
the 375 Field Communicator, details the specific functions of all the keys.
The 375 Field Communicator accomplishes its task using a frequency shift
keying (FSK) technique. With the use of FSK, high-frequency digital commu-
nication signals are superimposed on the X-STREAM unit's 4-20 mA current
loop. The 375 Field Communicator does not disturb the 4-20 mA signal, since
no net energy is added to the loop.
NOTES
The 375 Field Communicator must be upgraded to System Software 2.0 with
Graphic License for operation with the Hazardous Area X-STREAM O
Transmitter. The AMS software must be upgraded to AMS 8.0 or above for
operation with the Hazardous Area X-STREAM O
Contact Emerson Process Management's Global Service Center (GSC) at
1-800-833-8314 to upgrade the 375 Field Communicator software to System
Software 2.0 with Graphic License.
To interface with the X-STREAM, the 375 Field Communicator requires a ter-
mination point along the 4-20 mA current loop and a minimum load resistance
of 250 ohms between the communicator and the power supply.
The 375 Field Communicator can connect to the X-STREAM unit's analog
output signal line at any wiring termination in the 4-20 mA current loop. There
are two methods of connecting the 375 Field Communicator to the signal line.
For applications in which the signal line has a load resistance of 250 ohms or
more, refer to method 1 shown in Figure 4-3. For applications in which the sig-
nal line load resistance is less than 250 ohms, refer to method 2 shown in
Figure 4-5.
Method 1, For Load Resistance
Refer to Figure 4-3 and the following instructions to connect the 375 Field
Communicator to a signal line with a load resistance of 250 ohms or more.
Instruction Manual
IM-106-910C, Rev. 1.0
Transmitter.
2
$
250 Ohms
November 2009
2
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