As a follow-up on my previous post on the Futaba FF9 trainer interface, I’m reporting the measurements of my E-Sky “0404” remote.
The E-Sky uses a much more popular 4-pin miniDIN connector:
Using the described pin-numbering, I measured the following signals:
- pin 1 – shield: negative modulated PPM. Mostly high (1.7V), shorter pulses low (0V)
- pin 2: high impedance/not connected
- pin 3 – shield: 4V DC; probably used for remote power to the slave
- pin 4: low impedance, no signal; probably PPM input when in master mode