The following trouble must be FAQ. Please let me know the pointer or URL.

I typed like this.

I:	% cu -l /dev/tty00
SE/30:	Connected.
I:	at(I tried to type...)
SE/30:	cu: write: Input/output error
	Disconnected.
I:	% tip com0b
SE/30:	link down

Please let me know how I solve this trouble.

Machine:
	SE/30 (8M/40M + 1G)
	
/etc/remote:
com0b:dev=/dev/tty00:br#2400:

/etc/ttys:
tty00	"/usr/libexec/getty std.9600"	unknown off secure

/dev/tty00:
crw-rw-rw	1	uucp	wheel	12,	0	Dec 23 02:38 /ev/tty00


--KITAMURA