John:

Sorry for being so lazy in answering, and thank you, your message sort of solved my problem. The key is "These are invalid setttings for my machine", yes this piece of code did work on other machines. I dont know why, but on my Toshiba Portable this didn't work, i've tried the settings you've proposed, but it didn't worked either, maybe a hardware problem.

Thank you,
Joaquim

>>John,
>>No, the manufacturer didn't included any software with the device, but the same error occurs with a modem, it occurs even if i don't attach any device to the port.
>
>Joaquim,
>I was able to reproduce the error finally. The way I did it was to set the
>

>*Comm.Settings = "9600,N,8,1"
>Comm.Settings = "256000,S,4,1.5"
>

>These are invalid setttings for my machine, and it returned the error.
>Based on this, I would assume that one or more of the parameters you are passing in the settings property is incorrect. You can find more help in comm98.chm help file, on my machine was located at "C:\Program Files\Microsoft Visual Studio\MSDN98\98VSa\1033\COMM98.CHM". I hope this helps you out, let me know what you find.
>John