[time-nuts] Z3805 utility, Was: AW: (no subject)

[Mike S]

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.