2 May
2012
2 May
'12
3:08 p.m.
[...RS232...separate level shifter, at the least...]
I don't know whether anything analogous is true of USB, but in RS-232
there is a spec that (to paraphrase) any pins or combinations of pins
may be shorted to one another or any voltage source within a specified
range (probably -25 to +25 or some such) indefinitely without harm.
This sort of robustness is very nice to have in an external-world
interface.
Not the ethernet I use.... All cables are srraight and
have one
screen and one cetnre core.
Heh. Well pointed out.
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