custom VID/PID help

can anybody help me...?

I hv 1 FT232BM chip and EEprom 93lc46.
I am configuring my EEPROM using Eprog 3.0 software.

In that I do change with my own VID and PID both and downloading it to
EEPROM. and change the FTdibus.inf / Ftdiport.inf file with both VID and
PID.

but the problem is everytime my PC detect the same comport COM6 at all my
4 USB ports.

but when I erase and set the default vid pid then and then only PC detects
the all 4 deferent PORTs.COM6/7/8/9.

I have not selected the fix serial number though it is heppend..

so please can anybody give me the solution for that.

"milappatel" <miloo_best@hotmail.com> wrote in message
news:FI6dnf7KbugkpBXUnZ2dnUVZ_sfinZ2d@giganews.com...
> can anybody help me...?
>
> I hv 1 FT232BM chip and EEprom 93lc46.
> I am configuring my EEPROM using Eprog 3.0 software.
>
> In that I do change with my own VID and PID both and downloading it to
> EEPROM. and change the FTdibus.inf / Ftdiport.inf file with both VID and
> PID.
>
> but the problem is everytime my PC detect the same comport COM6 at all my
> 4 USB ports.

That is exactly what is supposed to happen.

> but when I erase and set the default vid pid then and then only PC detects
> the all 4 deferent PORTs.COM6/7/8/9.

Correct. If you erase the EEPROM, there is no unique serial number in de
device, therefore windows assigns a COM port number according to the used
USB port.

Using a serial number makes windows use the same COM port number regardless
of the USB port you have used.

Meindert