Re: 9 bit communication on RS 232

On Tue, 18 Nov 2003 14:46:49 +0100, Michael Hofmann
<[EMAIL PROTECTED]> wrote:

>suchitra wrote:
>> Hello All
>> I wanted to know how can we configure com port for 9 bit
>> communication.
>> I intend to use the 9th bit as Address/data bit..since i want to
>> communicate with more than one devices.
>
>though not proficient with the protocol, I could imagine you might be 
>able to abuse a second stop bit for your purpose.

The so-called 'stop bit' is really just a gap between characters whose
minimum length can usually be set, so you couldn't really use that.
Be careful of using parity - it's quite possible, but remember that
the PC UART has FIFO buffers for data, in other words data may be
queued but changes in parity will happen 'immediately'. 


-- 
Syd