So you look with an oscilloscope at the yellow or blue line and see if you can detect any activity.
If you can measure the signal and try and determine the baud rate. Then set the same baud rate in your sketch.
Then look at the R out signal into the Arduino, is this the right way up for TTL serial data. That is when there is no activity the line sits high? If not then swap over the yellow and blue wires.
hi.....
i already tried test using the connect i mention below and i got reading on an oscilloscope. i used MAX 483 ic ( http://my.element14.com/maxim-integrated-products/max483cpa/ic-cmos-bus-transceiver-dip8-483/dp/9725229 ).
Then, i dont know how to interface to arduino mega.. do u have any tutorial for interfacing to arduino?
TQ
