Re: serial port speed

[Rob Browning <rlb@cs.utexas.edu>]

Lawrence <ychim@ForeverMail.com> writes:

> Anyone knows the default serail port speed?  It is 38,400bps?  Which
> file responsible for this setting?  I want to increase it to 115,200bps.

Most versions of unix only support specifying the modem speed up to
38400 (for historical reasons).  So to specify a higher speed, you
have to tell the OS to use a higher speed when something like pppd
asks for 38400.  This is accomplished with setserial, see the man page
for details, but you're looking for the spd_hi and spd_vhi options.

I put these commands in an /etc/rc.boot/0setserial-local file so that
they happen every time I boot.

# !/bin/sh
# File: /etc/rc.boot/0setserial-local

STD_FLAGS="spd_vhi"

SETSERIAL=/bin/setserial

echo -n "Local serial port config...."

${SETSERIAL} -b /dev/ttyS0 ${STD_FLAGS}
${SETSERIAL} -b /dev/ttyS1 ${STD_FLAGS}

echo "done."

${SETSERIAL} -bg /dev/ttyS{0,1}

-- 
Rob


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