How do I change the speed on ttyd0?

[Marcelo Schmidt]

Hi,

I need to read data from a temperature sensor (PIC12C509) that requires:
serial data at 2400 baud, 8 bits, no parity, one or two stop bits.  I tried
several things, tip, cu,
Device-SerialPort-0.13, etc.  It seems to be the ttyd0 speed is locked in
9600:

# stty -a -f /dev/ttyd0
speed 9600 baud; 0 rows; 0 columns;
lflags: -icanon -isig -iexten -echo -echoe -echok -echoke -echonl
        -echoctl -echoprt -altwerase -noflsh -tostop -flusho -pendin
        -nokerninfo -extproc
iflags: -istrip -icrnl -inlcr -igncr -ixon -ixoff -ixany -imaxbel -ignbrk
        -brkint -inpck -ignpar -parmrk
oflags: -opost -onlcr -ocrnl -oxtabs -onocr -onlret
cflags: cread cs8 -parenb -parodd hupcl -clocal -cstopb -crtscts -dsrflow
        -dtrflow -mdmbuf
cchars: discard = ^O; dsusp = ^Y; eof = ^D; eol = <undef>;
        eol2 = <undef>; erase = ^?; erase2 = ^H; intr = ^C; kill = ^U;
        lnext = ^V; min = 1; quit = ^\; reprint = ^R; start = ^Q;
        status = ^T; stop = ^S; susp = ^Z; time = 0; werase = ^W;

My /etc/ttys:
ttyd0   "/usr/libexec/getty std.2400"   unknown off     secure  local

I also got sometimes: /kernel: sio0: 26 more tty-level buffer overflows
(total 8805).

So how do I change the speed on ttyd0?

Thanks,

========================================================
Marcelo R. Schmidt