[time-nuts] RE : Re: FASTRAX GPS

[Hal Murray]

jl.oneto at free.fr said:
> AFAIK, the differential variant of RS-232 is RS-485. I'm not sure about the
> levels.  

RS-422 is the basic version:
  http://en.wikipedia.org/wiki/RS-422

RS-485 is the multipoint version.


Interesting comment from http://en.wikipedia.org/wiki/EIA-485

The EIA once labeled all its standards with the prefix "RS" (Recommended 
Standard), but the EIA-TIA officially replaced "RS" with "EIA/TIA" to help 
identify the origin of its standards.[1] The EIA has officially disbanded and 
the standard is now maintained by the TIA. The RS-485 standard is superseded 
by TIA-485, but often engineers and applications guides continue to use the 
RS designation.

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