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Xi Advanced Electronics
4-10
Instruction Manual
IM-106-910Xi, Original Issue
November 2010
OPERATION VIA
HART/AMS
The 375/475 Field Communicator is a handheld communications interface
device. It provides a common communications link to all microprocesor-based
instruments that are HART compatible. The handheld communicator contains
a liquid crystal display (LCD) and 21 keys. A pocket-sized manual, included
with the 375/475 Field Communicator, details the specific functions of all the
keys.
The 375/475 Field Communicator accomplishes its task using a frequency
shift keying (FSK) technique. With the use of FSK, high-frequency digital
communication signals are superimposed on the Xi's 4-20 mA current loop.
The 375/475 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 Xi. The AMS software must be
upgraded to AMS 8.0 or above for operation with the Xi.
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.
Field Communicator
Signal Line Connections
When working at the Xi, the 375/475 Field Communicator can be connected
directly to test points TP21 and TP22 on the Xi I/O Board as shown in
Figure 4-3. The AM+ and AM- test points are provided to monitor the 4-20 mA
signal without breaking into the loop.
Figure 4-3. 375/475 Field Communicator Connection at the Xi