Connection

Pin 1: Audio Input (1Vrms Max)

Pin 3: Power Input (+5 to 12v)

Pin 4: Audio Output (1Vrms Max)

Pin 5: Xebro Output [Active High (3.3v) | Low (0v) | Low HiZ*]

Pin 7: Audio Ground (same potential as power ground)

Pin 8: UART TX Output

Pin 9: UART RX Input

Pin 13: Power Ground

Pin15: Xebro Input [Active High | Low] (5v tolerant)

Notes:

Xebro Output: Active when Receiving Audio from Zello Channel (i.e. Zello -> RF)

Xebro Input: Activate to Send Audio over Zello Channel (i.e. RF -> Zello)

*HiZ requires pullup on RF Radio Input, +5v tolerant)