Open interface III

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!!RADIO 25 pin D-SUB [https://remoteqth.com/img/wiki-open-interface-3-06.png\|noborder\|right] \| pin-1 \| in \| '''Input power''' 8-18V DC from Transceiver \| \| pin-2 \| out \| CAT TXD / CI-V \| \| pin-3 \| out \| USB4 +5V output \| \| pin-4 \| - \| USB4 -Data \| \| pin-5 \| out \| BCD4 output TTL \| \| pin-6 \| out \| BCD2 output TTL \| \| pin-7 \| out \| PA PTT \| \| pin-8 \| out \| PTT1 \| \| pin-9 \| out \| CW1 \| \| pin-10 \| out \| FSK \| \| pin-11 \| out \| Microphone (TX) \| \| pin-12 \| out \| TX audio \| \| pin-13 \| in \| RX audio \| \| pin-14 \| - \| Transceiver GND \| \| pin-15 \| in \| CAT RXD \| \| pin-16 \| - \| USB4 +Data \| \| pin-17 \| - \| Transceiver GND \| \| pin-18 \| out \| BCD3 output TTL \| \| pin-19 \| out \| BCD1 output TTL \| \| pin-20 \| out \| PTT2 \| \| pin-21 \| out \| CW2 \| \| pin-22 \| out \| PTT Microphone \| \| pin-23 \| in \| Interlock \| \| pin-24 \| - \| TX audio GND \| \| pin-25 \| - \| RX audio GND \| \| shield \| - \| Transceiver GND \|
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