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Answer Posted / nilesh66in
The power supply is a low impedance to the hart signal
shorting it out. Adding the resistor raises the impedance
so that the signal can be detected by the calibrator. The
HART protocol uses 1200 baud Frequency Shift Keying (FSK)
based on the Bell 202 standard to superimpose digital
information on the conventional 4 to 2OmA analog signal.
Nilesh Bhagwat ( Sr. Inst Tech)
| Is This Answer Correct ? | 2 Yes | 4 No |
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