18 Jun
2013
18 Jun
'13
2:54 a.m.
>
> The part of RS-232C I _really like_ is the impedance spec, the part
> that says that any pins or combinations of pins may be shorted to one
> another or to any voltage source within, I think, the valid RS-232C
> voltage range (-15V to +15V or some such - I forget the exact limits),
> with the shorts maintained indefinitely, without damage.
>
I have to agree with the above.
> I also like the splitting of protective ground
and signal ground.
> You'd almost think it had actually been designed by competent
> electronics engineers or somethin'....
On the other hand, I regard protective ground as something that seemed like
a good idea at the time but what protection it would provide and how did not
seem to be adequately thought out until much later versions of the standard,
if at all.
When making up an serial cable, I usually leave it out, not out of laziness
but because I think I'm probably as well or better off without it.
(at least that's my excuse and I'm sticking to it!)
Regards,
Peter Coghlan.