Hello!
      I'm currently working in Hidrogeological automation, developping
Hardware & Software for monitoring, and I have a big problem that is
driving me crazy for the last 2 months or so. I'm searching for any
help, and if someone can just give a tip, I would be extremely
gratefull.
      The problem is: I need to interface two devices, a water level meter
and a PIC, using RS232. Both works fine when connected to a PC. But
some level meters simply don't respond when connected to the
microcontroler (i'm using a MAX232 to interface the voltage levels).
I have two meters, and using a osciloscope, I did compare the output
signals. In one of them, the signal is strong enough to can be read
by the microcontroller. In another, it is pratically inexistent. But
the same one works on PC serial! I don't can figure out what is the
difference between the PC-serial and the MAX232, or something else
that can be making this difference on the process.
      The serial connection is a simple one, using only the classical TX,
RX and GND wires, without handshaking, low baudrate (9600).
      If someone just have this problem or knows how can I deals with it,
contact me please.

        Thanks to all,

--------------------------------------------
Dagmar Carnier Neto - Pesquisador

H2L - Laboratorio de Hidrogeologia &
Hidrogeoquimica
Dept. Geologia Aplicada - UNESP
Rio Claro, SP - Brasil
--------------------------------------------

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