FeeTech FAQ
http://www.feetechrc.com/faq.html

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5. Why FD search does not find ID?

Part 1 - Only one servo connected:

(c) For SCS15, recommend to power 7V ~ 8.4V

(e) SCS Servo default baud rate is 1Mbaud

Part 2 - More than one servo connected:

(g) Before connecting all servos, each servo must first be individually initialized using FD, with unique servo ID for each servo.

(h) Use exteral power supply with high capacity.

(i) If first search OK, but not afterwards, need to check if parameters have been modified.