Does anyone know how to run a parallax GPS in smart mode?

Hey all

Does anyone know how to run a parallax gps module in smart mode with arduino? I cant find any real info on it.

Below is the manual for the gps. I disconnected the /raw pin but the problem is the module has one serial connection for in and out... I would rather use hardware serial for this but that would mean connecting both the tx and rx to the same pin on the gps can i even do that?

http://www.parallax.com/Portals/0/Downloads/docs/prod/acc/GPSManualV1.1.pdf

I'd connect a 1k resistor in between Arduino and GPS and try experimenting with NewSoftSerial - send a command then use pinMode to make the TX pin go high-impedance. Should be OK with resistor to protect against over current.