Re: Second Serial Port on Multia

Eric Smith (eric@brouhaha.com)
31 Oct 1996 06:37:24 -0000

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"Brian E.W. Wood" <beww@intac.com> wrote:
> Actually the "rarely used" pins that are used are in fact part of the
> RS-232 specification, which specifies two ports on the standard DB-25
> connector. Assuming that the SPARC adheres to the official standard
> then its cable should work as well.

The EIA-232 specification does not provide secondary versions of all of the
signals. I don't remember at the moment exactly which ones were missing, but
I suspect that RI (Ring Indicator) was one of them.

I don't know whether the UDB's pin assignments for those signals are
arbitrary, or whether they match what Sun uses.

Cheers,
Eric

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