No, the RS232 levels and the TTL levels are always inverted. So your line vol tag is the opposite from your chip voltage. Do not add another inverter.Pencoys wrote:Not sure how relevant this will be...
TTL serial into MAX232 (inverter/Buffer) inverts the TTL.
So if the TTL out of the Pi is true TTL serial then you need a non inverting buffer chip.
Not looked into this. Gomments Cert?
No, there are no protection diodes.exartemarte wrote:Does anyone know for sure whether the gpio ports - specifically the eight general purpose i/o pins - have protection diodes? If they do then we should only need series resistors to limit the current rather than potential dividers to limit the voltage.
I ask because I'm thinking about an application that may have eight inputs, as well as other circuitry. The cost of a few resistors is not an issue but space probably will be, and I'd rather use eight resistors than sixteen.
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