Hi Olin and guys.

Can you recommend paperwork for RS232 handshaking ?
Mostly things I found in the net just describing how to wire
different connectors to each other. TIA232 specs saying alot
about timing, voltage, propagation delays,etc.. but nothing
about different schemes of handshaking used.

I'm looking for different ways to control CTS/RTS/DCD/DSR/etc
signals to communicate with standard/non-standard equipment.
Is there any book of paper in internet I can find to read?

Probably it can be found inside some serial FIFO chip specs.

Any ideas very welcome.


WBR Dmitry.


Olin Lathrop wrote:
>
> > >         Pin 2 max232 transmit
> > >         Pin 3 max232 receive
> >
> > This what I always use for PIC to PC. Numbers in parentheses
> > are the other pair
>
> Are you really sure!?  I think you've got PC pins 2 and 3 flipped in the
> schematic, although you defined them correctly above.  Pin 2 receives data
> into the PC and pin 3 transmits data from the PC.  Perhaps your schematic is
> intended to work with a cable that flips 2 and 3.  Most PCs have male DB-9
> connectors, so I like to put female DB-9 connectors on my PIC projects and
> wire them so that all you need is a "straight thru" DB-9 extension cord.  I
> think of it as the project connector plugging in directly to the PC, except
> that the extension cord is required to make is mechanically possible.
>
> Attached is a schmatic of such a project that has been built and works.
> Note that this used an ST variant of the MAX232 chip which requires 100nF
> caps instead of 1uF.  A +10V supply was also available, so the chip was only
> wired up to generate the -10V supply.
>
>   ------------------------------------------------------------------------
>               Name: sch.gif
>    sch.gif    Type: GIF Image (image/gif)
>           Encoding: base64

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