Arduino + Maxbotix Sonar (EZ0/1 etc)

Hi,

I read some posts regarding Maxbotix Sonar. I was going to try an experiment using least 3 sonars. The generic Arduino just has single set of RX/TX line. Can I use the same line to connect to multiple components supplying (sonar in this case) realtime data?
Or is there a software RX/TX parser too in arduino library which could allow me using other pins?

Thanks,
Vikas