Karl-Arne Markstro"m wrote:
> Hm...
>
> If the RS-232 standard has been around more than 50 years, it then would
> predate transistorised logic circuits.
> The most common computer serial communications standard well into the 60's
> was the 20 mA single-current loop.
Good point. I never thought of that.
> What this poster meant may have been that serial double-current (or bipolar)
> signalling has been around for a very long time,
> actually since the first long undersea telegraph cables.
Perhaps, I don't know.
The fact still remains RS-232 has been around a long time, and shows no
immediate sign of disappearing.
Another option, which might satisfy everyone is to include two
interfaces. Lots of equipment does this. This for instance has both
GP-IB and RS-232
http://www.thinksrs.com/products/SR844.htm
Or if that is not enough, take a look at this arbitary function
generator from Agilent
http://www.home.agilent.com/USeng/nav/-11457.536883183/pd.html
which bas ethernet, GPIB and USB. (Serial is no doubt excluded because
of the time it would take to download large waveforms).
--
David Kirkby,
G8WRB
Please check out http://www.g8wrb.org/
of if you live in Essex http://www.southminster-branch-line.org.uk/
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