Yes, there is a standard and I have an original copy. It is an EIA standard for 422A, 423A, 232C, & 449. It was published in 1984. Some of the actual standards within the large document go back to the early 70's. Regards - Mike
Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Robert Darlington Sent: Saturday, May 22, 2010 9:47 PM To: [email protected]; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject) Was there ever a standard? I always thought the "RS" stood for Recommended Standard, as in "you *should* do the following" as compared to "you shall do the following" I've seen inverted TTL talk to the RS232 port on laptops and I even sometimes use the max233's (+/- 10 volts instead of 12), but always use the full max232 with external charge pumps when it's a gadget that needs to work everytime with systems from multiple countries. -Bob On Sat, May 22, 2010 at 7:21 PM, Didier Juges <[email protected]> wrote: > Bruce, > > Thanks for the additional information. > > +/- 14V is quite unusually low in my experience. I typically use Maxim parts such as the MAX220 series, which is specified at +/-25V for no damage on the inputs (some parts in that series go to +/-30V). > > The bottom line is that as I pointed out earlier, there is no such thing as an RS-232 standard any more. > > Didier _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
