Eric Smith wrote:
 > <snip> 
 Connecting EIA-232 directly to EIA-422 could let the smoke
  out of something, and we certainly wouldn't want
that.
 
ISTR that 422 was simply a balanced line version of 232.  I think you
can just tie to the non-inverting line and ground and make it work.
Unless there's something else needed.
Gary Hildebrand
St. Joseph, MO