Serial-Data LVDT

Hello,

I have a LVDT connected to my COM1 serial port. This gives me around 7000 readings when I read the COM Port. It outputs a string like "N  +0.642...."  to signify the flatness of a section. The problem is that I am getting a string (Read Data) like shown in the VI and am not able to convert it into an array of readings in DBL format, which is required for further processing. 

I have attached the VI that I am using.

Thanks,

James