Re: Serial port

On Tue, 03 May 2005 18:26:08 GMT, Rich Grise
<richgrise@xxxxxxxxxxx> wrote:

>On Tue, 03 May 2005 09:43:42 -0700, Fred wrote:
>
>> After my question on the parallel port, I must ask you something about
>> the serial port. Why I cannot see on my scope the data signal if I put
>> my scope directly to the pins. To see it, I must connect the serial
>> port on an other device and then, put the scope on the line.
>>
>
>You have to jumper DSR to DTR and RTS to CTS, otherwise the computer
>thinks that what it's connected to isn't ready to receive.
>Do a google search on "null modem".

I had to do the null modem wiring on my win95/98 mcachines lto
echo bytes to the com port, but on XP the extra wiring wasn't
needed.
.

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