🚀 go-pugleaf

>X.10 is a CCITT standard and can be found in any good technical library.  If 
>your library does not have the X volume, V.26 is exactly the same thing.  And
>if you don't have the V volume, any book on data comms electrical interfaces 
>should have at least a little on RS-423, which for all intents and purposes is
>the EIA equivalent of the same thing.  It is an unbalanced, non-slew rate 
>limited drive, so it is a whole lot faster than RS-232 but is a lot noisier
>(because it is unbalanced) than RS-422/X.11/V.27.  For cursory information,
>National Semiconductor Interface data books newer than about 1986 have a good
>overview application note covering such interface specifications.

OOOOOPS!!!!

I swapped around X.10/V.10 and V.26/X.26...  Sorry about the blooey!!!  All 
references to X.10 above should read V.10, all references to V.26 should read
X.26, and for V.27 insert X.27...

X.10, according to the CCITT Blue Book, 1988, is categories of access for DTE
to PDNs.

It refers to X.20 and X.20bis, which defines async interworking; X.21 and X.21bis
which refer to sync interworking; X.28 which defines PAD interfacing, X.25 and
X.31 which is packet mode stuff on PDN and ISDN, and X.32, which is sort of 
dial-up X.25.

I'm not quite sure how this relates to your question about building automation 
systems, since any one of these categories will not happily interwork with any
other without some conversion...

(red-faced, embarrassed)
-- 
Arnim Littek                 Arnim@digitech.co.nz
Digi-Tech NZ           or    Arnim.Littek@bbs.actrix.gen.nz