Building equipment that has components operating outside of specs is not 
engineering, it is hacking.
If you intentionally choose to ignore specs your product will become an easy 
target for those who do follow specs.
BTW, I am not an Engineer.

John Ferrell    W8CCW
"My Competition is not my enemy"
http://DixieNC.US

----- Original Message ----- 
From: "Tony Smith" <ajsmith@rivernet.com.au>
To: "'Microcontroller discussion list - Public.'" <piclist@mit.edu>
Sent: Friday, January 12, 2007 10:26 PM
Subject: RE: [EE] Very odd problem with RS232...


>>
>> I could be out of date with this but RS-232 specs I have used
>> in the past go from a + level to a -level. 0 volts is an
>> invalid condition.
>> I would put a scope there to see.
>>
>> John Ferrell    W8CCW
>
>
> +3 to -3 volts is invalid.  -15 to -3 is logic 1, +15 to +3 is logic 0.
>
> Tony
>
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