On Jun 3, 2009, at 12:06 AM, Jay West wrote:
These devices had a lot of trouble with RS423, where
the voltage
was much less than RS232. I don't recall the exact numbers but
RS232 was something about 12V swings
+/- 15V
and RS423 was about 3.5V swings. Other than that, the
two were
pretty much identical. People often connected RS423 to 232 devices
with no problem at all. But those devices that expected power from
DTR or pins 9 or 10 (on a DB25) had a bit of difficulty when
plugged into a rs423 port.
Some Sun systems have jumpers to switch their serial ports between
RS232 and RS423 modes.
-Dave
--
Dave McGuire
Port Charlotte, FL