Emerson Micro Motion 1500 Configuration And Use Manual page 167

Figure A-3: Connection over local loop
A
A. Computer
B. Signal converter
C. Any combination of resistors R1, R2, and R3 as necessary to meet HART communication resistance requirements
D. DCS or PLC
E. Transmitter
Note
This figure shows a serial port connection. USB connections are also supported.
4.
Configuration and Use Manual
To connect over a HART multidrop network:
a. Attach the leads from the signal converter to any point on the network.
b. Add resistance as necessary to achieve at least one volt across the connection
points.
Important
HART/Bell 202 connections require a voltage drop of 1 VDC. To achieve this, add
resistance of 250–600 Ω to the connection.
E
B
Using ProLink III with the transmitter
D
R3
R2
C
R1
161