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LF-Series Flowmeters: Sensor/Transmitter Installation 29
I/O Wiring – FM AN Transmitters
I/O Wiring – FM AN I/O Wiring – FM FB and PAI/O Wiring – FM CIOSensor Wiring
Figure 6-3. RS-485 point-to-point wiring
Figure 6-4 HART multidrop wiring with SMART FAMILY
™
transmitters and a configuration tool
Note: The RS-485 communication wires must be shielded.
Other devices
RS-485/A
RS-485/B
Primary
controller
Multiplexer
HART-compatible
host or controller
HART-compatible
transmitters
SMART FAMILY
™
transmitters
Note: For optimum HART communication, make sure the output
loop is single-point-grounded to an instrument-grade ground.
24 VDC loop power
supply required for
passive transmitters
600 Ω maximum resistance
250 Ω minimum resistance
LF-Series FM AN
transmitter