Serial Port Woes

[Len Morgan]

I'd love to take a stab at finishing it up.  If you have any thoughts on 
what you feel is missing that you didn't get a chance to finish, let me 
know.  Maybe I can release a serial library we could all use.

len morgan

On 1/12/2010 12:26 PM, -= JB =- wrote:
> I was working on a serial port stack but have been prevented from 
> programming
> on it for over a year now due to being poisoned and tormented in my 
> own home
> by a communist nazi like secret society destroying select lives in 
> America.
>
> It is unfinished but it does some basic calls.  If you are interested 
> I will put it on
> the Rev site and allow anyone to use or improve it.
>
> -=>JB<=-
>
>
> On Jan 12, 2010, at 7:40 AM, Len Morgan wrote:
>
>> I'm having a lot of trouble consistently reading a serial port.  I'm 
>> trying to talk to a microcontroller using ModBus ASCII and the basic 
>> idea is to send a request for data (about 12 bytes) and then wait for 
>> an answer (about 300 bytes).  There is between a 1/4 and 1/2 second 
>> delay from when I send the command and the controller STARTS sending 
>> it back.
>>
>> I also can't get it to work at all if I open it for update (either 
>> text or binary).  I have to open the com port, send the command, then 
>> close the port and reopen it for read to get anything at all.
>>
>> I've tried "until linefeed", "until empty", "until eof", "for 1 
>> line", etc. and none of them seem to work reliably.  I KNOW that a 
>> response ends with a CRLF pair and there is only ever 1 "line" in a 
>> response so if I could just wait until I got the LF and it happened 
>> in say 3 seconds or less, I'd be happy.
>>
>> Any suggestions??
>>
>> len morgan
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