Well, if I recall correctly, ttySx and cuax behave differently in
some ways, at least ifcico won't work on ttyS1 here (I believe it is
the SIGHUP sent by the tty driver after the connection is made that
makes ifcico believe the connection dropped and hang up).
The only difference between ttySx and cuax is their behaviour when the
serial device is initially opened when CLOCAL is off and carrier detect
is low. Opeining ttyS will block under these conditions, unless you set
O_NONBLOCK while opening the device.
- Ted
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