Hart Module Connections - Honeywell SS4-A HART User Manual

7 HART Module Connections

Follow the steps below to connect a single HART module to a HART Master.
1. Turn off power to the detector.
2. Connect HART signaling line to J102 pins #2 and #3.
3. If you need current-source signaling in addition to HART, turn on both S100
switches by pressing them down (toward the circuit board).
4. Connect the positive terminal of your current load to J102 pin #2 (this is the
pin next to the ground pin).
5. Connect the return terminal of the current loop to J102 pin #1 (this is the
ground pin). Ensure that nominal loop resistance is approximately 250 ohms.
6. Turn on 24 volt DC power to the detector.
In the event you need to configure a multi-drop HART network, contact the
factory for further guidance.
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