Obtaining GPS fix (ORG447X)

Folks

I am using ORG447x to obtain GPS fixes. Whenever I power up my GPS module

Only response I get is $PSRF150,1,*3E

Even if I have to write a series of input messages

"$PSRF103,01,00,01,01*24" --> Query rate for GGL message

"$PSRF100,1,4800,8,1,0*0E" --> setting serial port

I have never got any GGL output mess开发者_StackOverflow社区ages.

Is there any specific initialization routine I need to follow after powering up my GPS module?

Any tips or pointers appreciated

Thanks

AK