Mike S wrote:
At 09:47 PM 5/22/2010, Robert Darlington wrote...
Was there ever a standard? I always thought the "RS" stood for
Recommended Standard, as in "you *should* do the following" as
Recommended Standard, and is "this is a standard which is recommended
for use."
The latest standard I've seen is ANSI/TIA-232-F-1977, Approved Sept 30,
1997, Reaffirmed Oct 11, 2002.
The actual standard is obviously more involved, but basically the
receiver should handle +/- 25 Volts. Anything between +/-3 is undefined.
The transmitter should produce in the range +/- 5-15 Volts into 3-7
KOhm. I believe the earlier RS-232C called for nominal +/- 12 Volts.
and any pin should source/sink 30mA
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