how to receive the value of the sensor - Programming VBA

[bunadi]

Dear all,
I have a problem how to write a program in Visual Basic Application.
I have a pressure sensor and in the specification of this sensor, there are the rs485,rs232, the addresse and the function.
The addresse is NR1 = 250
The function are
1. Function F48(DeviceAddr: Byte; val class, Group, Year, Week, Buffer, State:Byte): Integer;stdcall;export;
2. Function F66(DeviceAddr: NewAddr:Byte): Integer;stdcall;export;
3.Function F69(DeviceAdd: Byte;var SN:Longint):Integer;stdcall;export;
4. Function F73(DeviceAddr,Channel:Byte; var Value:Single; var Stat: Byte): Integer;stdcall;export;
5.Function F95(DeviceAddr, Cmd:Byte): Integer;stdcall;export;

I have written the program to open and close the serial port but I can not write the program , how to receive the value of this capteur. For example: in the sensor, it displays 10 bar and I would like to read and receive this value and then I put it in the excel. The probelem is , how to write the program and what kind of function I have to use so that I can receive the value of the sensor.

Could you help me please, because It is very urgent for my project.
thank you very much for your kind attention and I am looking forward to hearing from you.

bunadi
lasyim@yahoo.com