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HART-only device connected to HART AI channel

HART-only device connected to HART AI channel

HART-only device connected to HART AI channel

(OP)
Has anyone ever connected a HART-only device (i.e. without 4-20mA) onto a HART AI module?

RE: HART-only device connected to HART AI channel

No. It's not a functional concept.

The FSK modulated HART signal is superimposed on the current signal.

HART infers a current signal as well. For point-to-point, it's a 4-20mA signal. For multidrop, it's 4mA fixed. But there's always a current signal.

RE: HART-only device connected to HART AI channel

Why not just make a dummy current loop using fixed resistors then add the FSK Hart signal in series. The total loop resistance could be about 2k with the HART imposed over a fraction of that. You might have to experiment a little, perhaps some small capacitors to couple the signal across the resistance.

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