Emerson Network Router User Manual page 19

Installation and Setup
Figure 2-4 HART/Bell 202 connection to Model 1700/2700 I.S. transmitters
DCS or
PLC
R3
Notes:
• Connect the HART interface leads to the primary mA output of the transmitter, or to any point on the network.
• If necessary, use any combination of R1, R2, and R3 to bring the total resistance within 250–600 Ω.
• If no other device is connected to the primary mA output, add R1.
• If the primary mA is connected to a DCS or PLC with R2:
• Where R2 is insufficient, add R1 to bring R1+R2 into range.
• Where R2 is absent, add R3.
Installation and Use Manual
R2
External power supply
R1
Bell 202 signal
converter
USB plug
Primary mA output terminals
+
–
+
–
or
Transmitter
13