I'd say: drop "RS-232", and go for something like the old Macintosh serial (EIA-423 differential) which drives terminated lines near a kilometer long at 230 kHz. It's interoperable with RS-232, but the true-differential wiring model works better.
High speed (230K) RS232 drivers?
Started by ●December 10, 2011
Reply by ●December 17, 20112011-12-17