On 7/6/2013 04:06, Chris Albertson wrote:
But I think in this case it is just a three wire connection but still there
is room for errors like for example is one of them a TTL level and the
other RS-232. Some times you can mix the two, sometimes not.
This is a valid point. My radio will accept TTL and RS232 level signals
on the same port. (I should say 0 and 5 volts as the logic levels up to
-15/+15) However the polarity of them has to be proper. Most people
run a TTL level "RS232" signal (e.g. from a PIC) through a MAX232 and
think their done. In fact, the MAX232 inverts the polarity. The TTL
signal polarity must be changed for it all to work.
Regards,
Brian
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