connect gps logger by serial port

[hatemmakarem]

Dear Sir,

NEW challenge for you .

I have a gps logger which store the gps data into its internal memory. The gps is 747Pro model. It is based on mtk chipset MT3301 .
I have a description file for the data format and the communication protocol and how to send commands to the logger to get data .
this file is present at the following website L
http://www.rigacci.org/wiki/lib/exe/fetch.php/doc/appunti/hardware/gps/mtk_logger_library_user_manual_1.2_tsi.pdf

I had mad a vb.net application using serial port communication .When I Opened the COM3 , the device send the GPS location to the serial port .
Now , I want to download data from the gps logger , but I can not. I first tried to stop the logger from sending the location to the pc so as to download the data , but I failed , the command I sent to the unit was is described into the pdf file "$PMTK182,5*<CHK><CR><LF>" , but no thing happens , the unit still send signal ,
Also, I do not know how to download data from the unit.

GOOD NEWS:
----------
the pdf file contains at the last few pages a sample C++ code to connect to the unit . and set its prarameters.

Bad NEWS:
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How to do this ?.


So , I need to make a C# or vb.net application that can download data from the gps logger . and to set its configuration parameters .

Thanks ,

WSN