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Diane HernandezJul 26, 2025
What to do if my Emerson 475 Cell Phone has no communication with device?
- DDonna LopezJul 26, 2025
If your Emerson Cell Phone isn't communicating, there might be insufficient loop resistance. Try adding a 250 ohm resistor in series within the loop and check if communication returns. Also, ensure there's at least 4 mA and 12V DC at the device terminals. The device may be set to a HART Polling mode to Poll address other than zero (multidrop mode), so you can change Polling mode to Poll by Address.
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