Talk:EIA-422

Does anyone know where we can download the actual definition document? If so, please add it as a link in the article.

Not a protocol
I think EIA 422 is more of a "signalling standard" than a "protocol" - it doesn't specify much related to communications, more just voltage levels and slew rates. There is a terrible tendancy to broaden the use of terms into uselessness - a wheel isn't just round, it's "an implementation of circular technology". --Wtshymanski 18:55, 3 June 2006 (UTC)

Pin assignment
I have come to believe that connector pin assignments, specifically for DB9 connectors, were not standardized in the RS422 specification. Is this true? If it is true, the article should include a short statement about this, and the rationale. Now it appears that if I get a USB-RS422 adapter, I have to worry about each manufacturer's choice for the pin assignment. —The preceding unsigned comment was added by 157.127.124.15 (talk) 19:23, 5 February 2007 (UTC).
 * RS-422 is only the electrical characteristics of a signal. Pin and signal assingments using RS-422 electrical levels are in RS-449 (DB-37), RS-530 (DB-25), et. al.--J Clear 12:36, 27 April 2007 (UTC)

Logo
Is the logo shown twice in the below photo for EIA-422? -- Beland (talk) 12:18, 11 July 2008 (UTC)
 * Again showing the limitations of icons as a means of communication (they only convey meaning if you already know what they mean). Could be, but why not write "EIA-422" on the ports if that is what they are intended to be? I'm not aware that the standard designates an icon to label ports. --Wtshymanski (talk) 13:53, 11 July 2008 (UTC)



see also Apple Din-8 serial Adapter

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=115&prodSeriesId=25449&prodTypeId=18972&objectID=bpm01154

with http://h20000.www2.hp.com/bc/docs/support/SupportDocument/bpm01154/c00124442.jpg —Preceding unsigned comment added by 77.21.15.238 (talk) 13:52, 12 May 2010 (UTC)