[ros-users] Can't reconnect to SICK laser after killing node

Blaise Gassend blaise at willowgarage.com
Wed Sep 29 18:22:53 UTC 2010

Hi Dan,

The first two possibilities that come to mind for me are:
- The node you thought you killed isn't actually dead and still holds
a lock, or is still transmitting data. (Not sure whether the sick node
uses locking).
- The serial adapter you are using is buggy and is getting into a bad
state when you shut down the node.

If I were you I would try to use a terminal emulator such as picocom
to see if you can talk to the laser directly, and to see if the dongle
is working (connect pins 2 and 3 on a DB9 serial connector to get a
loopback that should echo back whatever you type).


On Wed, Sep 29, 2010 at 10:59 AM, Dan Lazewatsky <dlaz at cse.wustl.edu> wrote:
> I have a SICK LMS200 which I'm connecting using a serial->USB converter.
> After I plug it in, I can start up the node and get scan data with no
> problem. However, if I kill the node then try to restart it, it can't
> communicate with the SICK. The only ways I've found to fix this is
> unplugging and replugging the USB adaptor or rebooting the computer - both
> far from optimal. Does anyone know what might be going on, or what I can do
> to fix this?
> Thanks,
> -Dan
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