Modem Problem - Urgent

I’m Using a WAVECOM WMOD2

I’m using Hyper terminal to connect the Modem, iI set the Modem at Mexico with Telcel carrier. And i set the port settings as
Bits Per Sec : 9600
Data Bits : 8
Parity: None
Stop Bits: 1
Flow Control: None

Moreover i connected the modem with a USB to my PC via a USB-Serial convertor, because i don’t have the serial port.

the output of the modem is shown below. [size=150]Using USB- Serial Convertor[/size]

This is the output when i connected directly to a serial port of some other system with same port settings.

[size=150]Not using Usb - serial Convertor.[/size]

If i gave any command more than once it is responding. I don’t know why.

Please reply me asap.

Thanks

see http://www.wavecom.com/modules/movie/scenes/forums/viewtopic.php?f=30&t=1966#p7315