I looked at the manual to see how it works. Do you know how to operate the radio?
Frequency and other parameter control: Instruction interface (CI-V port, as described in manual #4). This is the instruction control interface. I checked the instructions, but I didn't see any (PTT control) functionality; it only allows controlling frequency and other operations.
PTT control for audio input/output: This is essentially the same as section 6 of the manual, referring to the ACC interface. The user needs to carefully review the interface definition or search for other ICOM models' ACC interface connection wire making posts.
CIV 89 and 90 should be connected to CH340, which covers serial communication.
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