Hi Charleson,
I just did what you are trying to do from scratch without any problem.
This is what I did.
1. Programme both boards with the output of Accelerometer V2_SE.mcp
2. Connect one board to a PC running a terminal emulator at 38k4 N81
3. Turn on this board, nothing happens.
4. Turn on the other board whilst holding down any one of the pusbuttons. This board will rapid flash LED 4
5. LED 3 on reciever board connected to PC will now rapid flash and data will be transmitted to PC.
If this doesn't work try the following:
A. Disconnect serial cable.
B. Take board 1 and turn on with one button depressed, LED 4 should flash.
C. Turn it off
D. Turn it back on without pressing any buttons, only the power LED should be on. Leave it on.
E. Take board 2 and turn it on without pressing a button, only power LED should be on.
F. Turn it off.
G. Turn board 2 on whilst pressing any pusbutton, LED 4 should flash and LED 3 on board 1 should start to flash also.
If this does not happen there is no use trying to connect a PC etc.
In the A to G test which board is one or two does not matter.
Let us know what you find with these procedures.