5 Sep
2002
5 Sep
'02
4:52 a.m.
From: "Gary Hildebrand"
<ghldbrd(a)ccp.com>
Eric Smith wrote:
NO!!!!
RS-422 inputs should not normally excede 7V. Many RS-232
are driven with 12 volts. Also, RS-422 is offset above ground
and not intended to take large swings below ground.
Most RS-422 receivers do not include ground as part of their
common mode operation, so you can't tie one input to ground
and get it to work.
Dwight
> <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