RS232 voltage levels (was PIC SBC requirement)
Dan Michaels email (remove spam text)
Ling SM wrote:
>>> The two
>> boards were working OK for last 2 years, but now on some sets the
>> boards would not talk to each other. Power off and on would not
>> recover the link, BUT unplugging and replugging the ribbon RS232
>> Any ideas what is happening?
What does your oscilloscope say?
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