alt Hacker NewsRS-485 is pretty much the standard to communicate with SDLC to another device. Think of this board as a serial port for a mainframe. Looks like the same card is intended for use in IBM POWER hardware too, running OS/400 or AIX (or Linux).
Of course, an open question is who on earth is still using SDLC over RS-485 these days, but then again I still see new Dell servers fitted with RS-232 ports.
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MisterTea • 12/09/2024
I hope serial never goes away. It's a time tested communications interface that is simple to implement and not a patent minefield.
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RS-232/422/485 are better than surprise USB-C port that require outdated specific Rust compilers and random 32bit ARM binary and an archive.org copy of random repository along cryptic code comments in it to make it work. Obsoleting RS-* ports could very well trigger that event.