View Full Version : Change script output from Serial to USB?
March 9th, 2009, 09:35 PM
I have read the stickies and did a search for USB, but cannot find what I'm looking for yet.
I have a script that drives a vinyl cutter from Inkscape. I have a new computer that has no serial port...
The original line from the script is:
stty 9600 cs8 -parenb -parodd crtscts -ixon -ixoff -F /dev/ttyS0
How do I change it so it will output to a USB device?
Running lshal and dmesg led me to learn my plotter is hooked up to:
Any ideas? I don't need to cut something immediately, but I'm getting worried...
March 9th, 2009, 10:53 PM
Try these two commands:
find /sys/devices/pci0000:00 -name "tty*" -print
the last command on another computer returns thus:
If you get an output like the above, you might only need to change the device
name from ttyS0 to /dev/ttyUSB0 (if you get lucky. This is untested, and
whether it works may depend on how well the USB device serial driver is integrated with a tty device.) Post what driver is being used, if you find out.
March 10th, 2009, 05:18 AM
Here are the outputs:
Bus 006 Device 002: ID 0bda:0151 Realtek Semiconductor Corp. Mass Stroage Device
Bus 006 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 004: ID 0461:4d15 Primax Electronics, Ltd
Bus 001 Device 005: ID 04f9:01b1 Brother Industries, Ltd MFC-665CW Remote Setup Port
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
bruce@Brutus:~$ find /sys/devices/pci0000:00 -name "tty*" -print
I found out that the plotter is on Bus 004 (via dmesg), and the last command returns nothing.
Thanks for the idea. I sure wish it would've worked, but do you have a Plan B?
You just saw my Plan B....
March 11th, 2009, 02:19 AM
You can get a usb-serial adapter (http://www.vpi.us/usb-serial.html). It should then show up as /dev/ttyUSB0 similar and you can simply use that as your serial port.
March 11th, 2009, 02:36 AM
USB to serial adapters work well. If you decide to go this route be careful and get a cable with a good usb->serial driver chip. In my experience, cables based on the FTDI chip worked very well (completely plug and play) with linux. I had a cable based on the prolific chip that didn't work at all.
There are cheap ones on ebay: http://shop.ebay.com/?_from=R40&_trksid=m38.l1313&_nkw=ftdi+usb+serial&_sacat=See-All-Categories
March 11th, 2009, 09:16 AM
You may be testing on an older OS. I was using a liveCD running Ibex, which
uses the sysfs filesystem. If your OS does not have this filesystem
your plan B may also involve a newer OS. You can check for the filesystem
cat /proc/filesystems | grep sysfs -
It should provide a line saying "nodev sysfs" or equivalent if it is present.
I am using devices with the prolific chip, manufactured by two different companies. I can get them to communicate, but have not yet found out how to
set the speed to be used. I was expecting to use the sysfs filesystem to make
any needed tweaks. Has anyone seen any tutorial or HOWTO using the prolific
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