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September 2020
2
Bench top configuration
When performing bench top configuration it is suggested that you connect
the THUM Adapter to a wired device. If this is not possible, the following
wiring diagrams can be used. For bench top configuration, ensure the power
supply used is limited to 0.5 A maximum.
Figure 2-1: THUM Adapter Only, Powered by a Current Source
A. THUM Adapter
B. Ground
C. 20 mA current source
D. HART Modem
Figure 2-2: THUM Adapter Only, Powered by a 24 V Power Supply with
1200 Ohm Resistor to Limit Current to 20 mA
Quick Start Guide
A
Green
Red
Black
White
Yellow
A
Green
Red
Black
White
Yellow
Quick Start Guide
B
+
C
-
D
B
+
C
-
D
7
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