Emerson MICRO MOTION 1700 - Manual (Page 85)

7.3 RS-485 point-to-point wiring
RS-485 point-to-point wiring Figure 7-3:
A
B
C
A. Other devices
B. Primary controller
C. Multiplexer
7.4 HART multidrop wiring
Tip
For optimum HART communication, single-point ground the output loop to an instrument-grade
ground.
I/O wiring for Model 1700 and Model 2700 transmitters with analog outputs
Installation Manual 81