Interfacing Ultrasonic Sensor with BeagleBoard XM Rev C

       I am working on a project that requires interfacing LV
EZ1 with beagle board. I am able to interface one sensor and was able
to read the readings from the sensor using serial cable. Now i need to
interface more than one sensor to the beagle board.
Can i get some help on how to do this. Thank you.

Hard way: find a microcontroller with many serial ports and program it
as a gateway between the sensors and BB.
Easy way: get USB serial adapters with TTL inputs and use them to
connect the sensors (e.g. like this one: Depending on the number of
sensors you may need to use an external USB hub.