Important
HART/Bell 202 connections require a voltage drop of 1 VDC. To achieve this, add resistance of
250–600 Ω to the connection.
Figure B-6: Connection to mA output terminals
A. PC
B. RS-232 to Bell 202 converterRS-232 to Bell 202 converter
C. External power supply, if required
D. 250–600 Ω resistance
E. Transmitter with end-cap removed
F. HART connection posts
Note
This figure shows a serial port connection. USB connections are also supported.
The signal converter must be connected across a resistance of 250–600 Ω. The mA output requires an
external power supply with a minimum of 250 Ω and 17.5 V. See the following figure to help determine
the appropriate combination of voltage and resistance. Note that many PLCs have a built-in 250-Ω
resistor. If the PLC is powering the circuit, be sure to take this into consideration.
Using ProLink III with the transmitter Configuration and Use Manual
March 2019 MMI-20025166
326 Micro Motion Model 5700 Transmitters with Configurable Outputs
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