Talk:Modified Modular Jack

if the TX and RX signals are diferential, how can it be called RS-232? 210.48.82.11 (talk)

Despite what this page claims, RS-423 is _not_ differential. It's single-ended, just like RS-232 but with different voltage levels. See http://en.wikipedia.org/wiki/RS-423.

-- 64.122.56.22 (talk) 19:52, 27 October 2010 (UTC)

--67.242.2.23 (talk) 22:51, 14 December 2008 (UTC)

If any photos are still wanted for this page, I have uploaded a few I took last year. Someone who has a better idea of what is appropriate for this page can have a look at them and use any suitable ones that are good enough. They are all licensed under the Cc-by-3.0 license and are available from http://picasaweb.google.com/dgsoftnz/MMJ. Randomize (talk) 07:32, 27 February 2009 (UTC)

The third paragraph makes no sense. I suggest rewriting it. It links to some undefined "connection cable" that apparently does some magic that fouls up RS232? Nonsense! Simply explain that the signals are arranged symmetrically, such that reversing the order of the pins accomplishes the TX/RX and DSR/DTR matchup that DTE to DTE communication requires. If necessary, then link to an article that explains how it is done with a "typical" RS-232/423 to allow a reader to contrast the ease on his own. 98.243.193.15 (talk) 22:52, 3 May 2009 (UTC)

Is this 423 or 422?
"each signal is the voltage difference between the line and its associated ground". According to the RS-423 article, and what I remembered which is why I looked there, RS-423 uses a common ground for all data pins. So which is correct? Maury Markowitz (talk) 11:27, 7 October 2015 (UTC)

CEA-909
It looks to me that CEA-909 also uses the MMJ, which may be more applicable than old DEC equipment. Gah4 (talk) 03:18, 13 April 2017 (UTC)