On Sun, 9 Apr 2000, Shourya Sarcar wrote:
> hello folks,
> is it possible to design some kind of a loopback on the serial port so
> that i can send out a message and read _that_ back using the serial port ?
> i want to write a communicating s/w for a 8085 microprocessor but since i do
> not have a 8085 with me now , i want to simulate that.
>
You can use a female D-SUB connector (either 9 or 25 pin) and
simply connect pin 2 and 3 together with a piece of wire. This
avoids the need of direct IO programming the UART chip for
switching the internal loopback on.
This is a very simple loopback connector, because it leaves the
modem control signals unused. In consequence you must set the
CLOCAL flag when you initialize the port.
Good luck
Gerald
--
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