Re: Firecracker and USB-Serial

["Josepi" <JRM.@xxxxxxxxxxxx>]

Different RS-232 spec.

There are two RS-232 specs. RS232C and RS232. Different voltage limits are
allowed. % volts is just fine for one

http://en.wikipedia.org/wiki/RS-232

If you are not using DB25 connectors do not call it RS-232, call it serial
interface.

Now you have to specify DTE or DCE to specify what connector you are using.




"petem" <petem001@xxxxxxxxx> wrote in message
news:i925vs$o50$1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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..



"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.
>



> 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