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Icom M422 programming cable

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I'm looking for Icom m422 programming cable schematics or pinout. From Icom MIC connector to RS232 Sub9.

Any help will be appreciated. Best regards.
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mic pinout
1- vcc
2- af/mic
3- mic g
4- gnd
5- PTTC
6- EXTTXD
7- EXTRXD
8- ICF3

location USA
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Thks!! I understand that I have to use pins 8 & 4 on the VHF side. But what about the computer serial port side?

Regards 
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The m422 uses the opc478 or opc478u programming cable connected to the opc980 adaptor.
You will need to build a opc478 then wire it to the programming pin and gnd pin on a Mic connector


location USA
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