using rs232 chips to link io ports

[Dan]

http://www.hampleman.com/rs232.htm

The bmp in the above link shows how I want to use (2) sp232a chips (similar
to MAX232) to connect 2 processor's I/O pins together so I don't have to
worry about burning out the io pins if they aren't configured as input or
outputs which has happened to me before. I did post a question to this
effect before and someone recommended using the 232 chips. I just want to
make sure it will work.

Dan

dansteely2001 at yahoo dot com

 

[Rob Gaddi]

Looks like it ought to, and at only about 20x the cost of series
resistors on each line.

Dan wrote:

http://www.hampleman.com/rs232.htm

The bmp in the above link shows how I want to use (2) sp232a chips (similar
to MAX232) to connect 2 processor's I/O pins together so I don't have to
worry about burning out the io pins if they aren't configured as input or
outputs which has happened to me before. I did post a question to this
effect before and someone recommended using the 232 chips. I just want to
make sure it will work.

Dan

dansteely2001 at yahoo dot com

 

[Roger Lascelles]

"Rob Gaddi" <rgaddi@bcm.YUMMYSPAMtmc.edu> wrote in message
news:cu0mtn$cn@gazette.corp.bcm.tmc.edu...

Looks like it ought to, and at only about 20x the cost of series
resistors on each line.

Dan

Rob is telling you to put 2K2 resistors between the pins of the two
processors and forget the interface chips.

Roger

 

[Dan]

Its just a 1-off and I don't want to take any chances.

Dan

"Roger Lascelles" <invalidl@invalid.invalid> wrote in message
news:36ig6hF52e1a9U1@individual.net...

"Rob Gaddi" <rgaddi@bcm.YUMMYSPAMtmc.edu> wrote in message
news:cu0mtn$cn@gazette.corp.bcm.tmc.edu...
Looks like it ought to, and at only about 20x the cost of series
resistors on each line.


Dan

Rob is telling you to put 2K2 resistors between the pins of the two
processors and forget the interface chips.

Roger

 

[Dan]

Besides, I might have the 2 processors some distance from each other.
Wouldn't the higher voltage levels help in that case?

Dan

"Roger Lascelles" <invalidl@invalid.invalid> wrote in message
news:36ig6hF52e1a9U1@individual.net...

"Rob Gaddi" <rgaddi@bcm.YUMMYSPAMtmc.edu> wrote in message
news:cu0mtn$cn@gazette.corp.bcm.tmc.edu...
Looks like it ought to, and at only about 20x the cost of series
resistors on each line.


Dan

Rob is telling you to put 2K2 resistors between the pins of the two
processors and forget the interface chips.

Roger

 

[hamilton]

Dan,

On my screen, the two processors are only less than an inch apart.

In you first message, no mention was make about distance.

What did you expect ???


Dan wrote:

Besides, I might have the 2 processors some distance from each other.
Wouldn't the higher voltage levels help in that case?

Dan

"Roger Lascelles" <invalidl@invalid.invalid> wrote in message
news:36ig6hF52e1a9U1@individual.net...

"Rob Gaddi" <rgaddi@bcm.YUMMYSPAMtmc.edu> wrote in message
news:cu0mtn$cn@gazette.corp.bcm.tmc.edu...

Looks like it ought to, and at only about 20x the cost of series
resistors on each line.


Dan

Rob is telling you to put 2K2 resistors between the pins of the two
processors and forget the interface chips.

Roger