18 Sep
2000
18 Sep
'00
6:55 p.m.
"Richard Erlacher" <richard(a)idcomm.com> wrote:
It's been at least 10 years since my last look at
RS422, bit IIRC, there
were two connectors involved in that spec. There was a DC37 of one geneder
or another, and there was, I believe, a DA15 as well, which was the one with
the differential high-rate signals on it. Does that sound reasonable to
anyone. I know most applications use(d) a subset of this standard but
referred to it as RS-422 only because they used the 5volt differential
signalling-copmpatible drivers, e.g. 26LS32/33, MC3486/87, etc.
I think you might be talking about RS-449. AFAIK, RS-422 is ONLY an
electrical specification, and does not recommend a connector. IIRC,
RS-449 specifies a connector and the use of RS-422 electrical interfaces.
And then there's RS-485, which is multi-drop (party line) RS-422. No
connector spec for this one either.