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Cannot change baud rate on usb serial device

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http://unix.stackexchange.com – I recently upgraded to ubuntu 12.04 from 10.04. Under 10.04 I had no trouble using usbserial driver to connect to a device through the serial port. After the upgrade usually I cannot reset the baud rate: it is initialized to 9600, but my device needs 115200. When I try to reset the speed I get: $ sudo stty -F /dev/ttyUSB0 speed 9600 baud; line = 0; -brkint -imaxbel $ sudo stty -F /dev/ttyUSB0 115200 stty: /dev/ttyUSB0: unable to perform all requested operations $ sudo setserial -av /dev/ttyUSB0 Cannot get serial info: Invalid argument $ ls -l /dev/ttyUS* crw-rw---- 1 root dialout 188, 0 Nov (HowTos)

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Submitted by missing on 11/26/2012 – Made popular on 11/26/2012

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I run:

stty sane < /dev/ttyS1 stty -brkint ixoff -imaxbel -iexten < /dev/ttyS1 stty -F /dev/ttyS1

The result is:

speed 38400 baud; line = 0; -brkint ixoff -imaxbel -iexten

Next I run:

/sbin/getty -L ttyS1 38400 vt100&

...and the serial connection doesn't work as expected.

setting serial port parameters 20 weeks 6 days ago

I have difficulties setting serial port parameters. After program that works fine on same device, stty output is following:

$ stty -a -F /dev/ttyUSB0 speed 1200 baud; rows 0; columns 0; line = 0; intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; flush

I am using Aten UC232A Converter to communicate with my micro-controller device using 3 wire interface ie txd, rxd and ground. Though the converter gets detected and driver loaded in my suse11.2. The operation does not work. following are the logs.

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drivers/usb/serial/usb-serial.c: USB Serial support registered for pl2303

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stty -F /dev/tty0 -a shows the speed as 38400 stty -F /dev/ttyUSB0 -a shows speed as 115200

Barry

Hello,

I'm using an ftdi bridge chip, where I need to set the baudrate to 250k baud. I'm writing a program in C++ using the boost C++ librarys, every time i try to set the devices baud rate to anything other than the standard values an exception is thrown. I'm running fedora 12 and have printed the log bellow from when the device is plugged in.

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P: /devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4:1.2/ttyUSB0/tty/ttyUSB0 N: ttyUSB0 S: char/188:0 S: serial/by-path/pci-0000:00:1d.7-usb-0:4:1.2-port0 S: serial/by-id/usb-HUAWEI_Technology_HUAWEI_Mobile-if02-port0

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I'm debugging a kernel module under VirtualBox with a guest and host OS as Ubuntu 10.10. I'm using the virtualbox serial port but I'm maxing out at the baudrate 115200. My grub config looks like this...

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