Emerson MICRO MOTION 1700 - Manual (Page 101)

HART/analog single loop wiring Figure 9-2:
A
B
A. 820 Ω maximum loop resistance
B. HART-compatible host or controller
9.2.3 HART multidrop wiring
Tip
For optimum HART communication, single-point ground the output loop to an instrument-grade
ground.
I/O wiring for Model 2700 transmitters with configurable input/outputs
Installation Manual 97