I got a problem with a MAX232.
So I got a circuit that is decoding a FSK signal and converting it with a MAX232 so that I can read
it with a Serial Monitor Programm on a PC.
For my Laptop I use a Serial to USB cable to hook it up to an USB port:http://www.frontierpc.com/cables-adapters/connector-cables/misc/products/iogear-usb-pda-serial-adapter-guc232a-10033386.html
This works without a problem.
So now I would like to use the Signal coming from the MAX232 directly with an Arduino. This should be possible by just connection it
to the UART (Pin 0) to receive the Signal. However I do receive something with my Arduino UNO but with the Arduino Mega the port is silent.
With the UNO a lot (all) of the bytes get lost or are corrupted so you can't read the signal it is strange.
The same is true when I use a FTDI Basic Breakout board from Sparkfun. I can read the Signal with my computer but it is not usable for further decoding.
So why is this do I need some filters? Why is it working with the Serial to USB cable?
Thx for your Help,