Hi friends,

sorry for delay in answer but I have been a couple of weeks in vacation
;-).

Rereading our EMAILS, I have understood that the problem that I have posted
was given in wrong way.

A little history can help.

In normal working condition with PC and the device that I have at the
begining:

PC COM1: TX----->MAX3232-------->RX 3.5V device

PC COM1: RX<-----MAX3232<--------RX 3.5V device

and works PERFECTLY (obviously because is normal working conditions)




Using a PIC powered at 5V instead of a PC:

PIC out pin ----->MAX3232-------->RX 3.5 device


PIC in  pin <-----MAX3232<--------TX 3.5 device

and works PERFECTLY!




Trying to remove the MAX3232 (It is not a typing error for MAX232, but the
version for the 3.5V powered device), maintaining the PIC powered at 5V:

PIC out pin -------Diode-Diode--------->RX 3.5 device


PIC in  pin <------resistor-------------TX 3.5 device

in this condition I have a working condition, (that means the TX and RX
levels are near to good) but unreliable.


I suppose now you have a better view of my problem.


Saluti

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