RE: [uCsimm] Problems with RTS and CTS in uCsimm

From: Asier Goikoetxea Yanci (
Date: Tue Dec 19 2000 - 15:55:51 EST

    Hello Claudio,

    I don't modified the uCsimm, and I don't need convert CTS and RTS to
RS232 level signals because the modem that I'm using has TTL level signals,
so I only need convert RS232 signals to TTL (just RxD and TxD).
So, what can I do?, Should I convert 0/3.3v signals to 0/5vsignals?
If uCsimm's output high minimun is 2.4v, and input high maximun is 7v, there
shouldn't be problems to communicate uCsimm with a modem, no?


-----Mensaje original-----
De: Claudio Duffini <>
Para: <>
Fecha: martes 19 de diciembre de 2000 19:07
Asunto: Re: [uCsimm] Problems with RTS and CTS in uCsimm

>Hello Asier
>Uhmmmm......unless you modified the uCsimm, the unique pins >connected
>to the MAX3221 are TXD and RXD. There are not supported >modem signals
>on the board. You should include the rs232 level translation (you >have
>bare logic levels 0/3.3 V on the control lines, instead that +12/-12).

Asier Goikoetxea Yanci
Mondragon Unibertsitatea
943 794700 ext 314

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