Why is it necessary to connect signal pins 2 and 3 via jumper on an APM2.8 board to enable PPM. I am using flysky fs-ia6b receiver with the APM mentioned above. Pins 2 and 3 control pitch and throttle respectively so how does shorting these two pins helps with PPM and why not roll (pin1) and yaw (pin4) require such shorting.

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    $\begingroup$ Hi @A.Sinha, can you elaborate on this question? One line questions are rarely sufficient. It's a good idea to include details of what you want to understand, what you've researched so far, what you found & what you expected to find. Please take a look at How to Ask & tour for more information on how stack exchange works and work through the Robotics question checklist to edit your question to make it clearer. $\endgroup$ – Ben Dec 1 '19 at 18:06
  • $\begingroup$ On stack exchange, comments are not intended for extended discussions, they are for helping to improve questions and answers. Comments are distracting, so we try to keep them to a minimum. They should be considered ephemeral, any comment which no longer actively helps to improve a question or answer may be deleted at any time to tidy up a post. For extended discussion on a question or answer, please use Robotics Chat. Also, please try to be nice. $\endgroup$ – Mark Booth Dec 2 '19 at 10:11
  • $\begingroup$ The pulse position modulation (PPM Encoder) is part of the Ardupilot Mega (APM) board to control drones. According to the quickstart guide, the pins have to connected before the first run. quote “The encoder also detects the loss of RC signal in the RC receiver” Vaswani, Vishal, et al. "Modular Quadrotor MAVs." (2014). $\endgroup$ – Manuel Rodriguez Dec 4 '19 at 16:58
  • $\begingroup$ @ManuelRodriguez What is the purpose of connecting the two pins. $\endgroup$ – A. Sinha Dec 4 '19 at 17:11
  • $\begingroup$ @A.Sinha - Could you please edit your question to include more details? This has been requested several times now. As jsotola correctly mentioned, jumpers are used to make configurations that are both non-volatile and user accessible with no special tools. Beyond that, the functionality that is enabled is determined by whatever the software is programmed to do. When I try to look online to help answer your question, I had to start by Googling "APM board," because your question doesn't link it. There seem to be several options - plane or copter? Several versions, several suppliers, etc. $\endgroup$ – Chuck Dec 6 '19 at 14:12

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