[sdiy] Information Content of Signals

[Neil Johnson]

> For instance, many telecommunication signals use a trinary signal, i.e.
> an n-ary signal with n=3 meaning three levels. What people don't realize
> is that good old trusty RS-232 is really a trinary system. The third
> level means "BREAK" on the Rx and Tx lines.

Funny, every PC keyboard I've ever seen has a "BREAK" key :-)

Cheers,
Neil

--
Neil Johnson :: Computer Laboratory :: University of Cambridge ::
http://www.njohnson.co.uk          http://www.cl.cam.ac.uk/~nej22
----  IEE Cambridge Branch: http://www.iee-cambridge.org.uk  ----