Develop small adapter board between USB-to-TTL and connector - ERNI 305-214013, in a small box (Serpac A-20). Following USB-to-serial with 0,1" header.
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The board is noticeably shorter than the box board to allow cable restraint in the box.
Altium shall be used, and all files needed for pcb manufacturing provided (gerber etc). Also, the Altium files shall be provided.
See attachment, this is a trivial project.