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Thanks everyone. Adding my user to the dialout group worked perfectly. I discovered that the sensor is renamed each time it is unplugged and plugged back in, which was part of my problem (ie - instead of ttyUSB0 it became ttyUSB1).

I still seem to get the

No tf data.  Actual error: Fixed Frame [laser] does not exist

I do not know what I need to do to my .launch file to correct this. I can get realtime data, as in it publishes data, but I don't know what to do about this error.

Thanks everyone. Adding my user to the dialout group worked perfectly. I discovered that the sensor is renamed each time it is unplugged and plugged back in, which was part of my problem (ie - instead of ttyUSB0 it became ttyUSB1).

I still seem to get the

No tf data.  Actual error: Fixed Frame [laser] does not exist

I do not know what I need to do to my .launch file to correct this. I can get realtime data, as in it publishes data, but I don't know what to do about this error.