Hi all,

Recently I made a Caller ID decoder using SM8223 chip and I decided to
connect it's out put to computer serial port and I bought a MAX232 chip and
I made a prototype board regarding to it's data sheet.
My problem is when I use my decoder separately it works well (I think
because actually I don't see the result but I can see the CID found signal
with an LED connected to board) but just when I connect ANY PINS of my RS232
converter to the CID board (Even GND wire of my RS232 Pro board) it stops
working (ie. LED doesn't show CID signal ). I tried to separate the Power
supply of my boards but this time the same problem when connecting TxD (ie
T1 pin) of MAX232 to CID decoder serial output was exists.

NOTE: 
I tested my RS232 board with another board with PIC16f84 and it works fine!

Does any one have a suggestion.

Thanks in advance.
MAMAD
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