Re: Firecracker and USB-Serial

["petem" <petem001@xxxxxxxxx>]

"isw" <isw@xxxxxxxxxxx> a écrit dans le message de groupe de discussion :
isw-DA72EE.21034411102010@[216.168.3.50]...
> In trying to get this combination to work on my Mac with heyu, I've
> discovered that DTR is never going high. With a 'scope, I can see the
> "1" signal on RTS pulsing merrily, but the "0" signal on DTR never
> moves. Which probably explains why the Firecracker isn't working...
>
> Can anyone shed any light on this problem? I understand that some
> USB-Serial adapters won't work with the Firecracker, but I never was
> able to find out precisely why (though there seemed to be an assumption
> that it had to do with "low signal levels"). That is not the case here
> -- the signal on RTS swings a full 5 volts.
>

Dont know if the firecracker need more then 5 volt, but if I am right the
voltage for rs232 are supposed to be -12 to +12 volts..not 0 to 5 volts..



> Could it be my cheap no-name USB-Serial adapter? Or the open-source
> driver I'm using?
>
> Does anybody have a Firecracker working with a USB-Serial? What brand,
> and which chip does it use?
>
> thanks
>
> Isaac