Re: RTS CTS Problem

On 30 Jan, 19:38, Didi <d...@xxxxxxxxxxx> wrote:
the problem is that when I set the CTS AVR GPIO high(1) the voltage
that I see the 9 way connector pin is -5v and when I set CTS AVR GPIO
to low(0) the voltage on the 9 way connector is 0v.

Is that the expected behavior? I think i am missing some fundamental
concept.

It is the expected behaviour allright if the buffers you use are
inverting (they normally are).
But you need to drive CTS _low_ to enable data flow, not high.
This is how all CTS inputs (past buffers, at TTL level) I have
seen work. :-)

By _low_ do you mean 0 on the AVR GPIO, sorry just clarifying. When
will RS232 be banned? :- {)
.