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 Re: CF card van Avisaro Kategorie: Programmierung Basic (von TomTom - 20.11.2005 10:54)
 Als Antwort auf CF card van Avisaro von Hans - 16.11.2005 12:17


Hello Hans!

What kind of "CF card / Avisaro" is it? Is it Ordernumber: M3248? Did you realize, that it is driven with 3.3 Volt? That means, "RS232"-Level is also 3.3 Volt!
You wrote: Now the data is coming direct from the C-control M-Unit 2.0 PIN 52 instead of the IC RS232 and that works" It is a miracle, that the Avisario survived the mistreatment of sending +/-12 Volt into its logic of 0 / +3.3 Volt!
I guess you need a level shifter to connect 5 Volt logic to 3.3 Volt logic...
Also keep in mind, that a MAX232 not only shifts the Level (0...5 Volt to +12...-12 Volt) but also inverts the signal. That means: an idling Tx-pin has a level of +5 V (with 5 Volt logic), after the MAX2332 the idling level is -12 Volt!

regards  Tomtom

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Bisherige Antworten:

Re: CF card van Avisaro (von Hans - 20.11.2005 12:10)
    Re: CF card van Avisaro (von TomTom - 20.11.2005 16:52)