I am trying to connect an sbg-systems Inertial Measurement Unit via USB (on an externally powered USB HUB) to an Overo Fire mounted on a Tobi expansion board (running the pre built image provided by Gumstix). The serial communication library provided  by the manufacturer for reading the data from the IMU on a pc compiles without a glitch however, I am not able to recognise the name of the device for eg. whether it is ttyS0/ttyS1 etc. I tried the command "$ dmesg | grep tty " but it does not list the name of the location where the device is connected. Due to this problem I am unable to communicate with the device.

Does anyone have any ideas as to how this could be solved ?

Thanks in advance