You might want to make a small RS232 adapter to a PC. using hardware flow control as this is enabled by default connect to the PC and disable it then you’ll be able to use the three wires you need… Other wise you’ll have to find out how the Domino achieves hardware flow control and which pins you need to connect.
I was using the shield however it was giving me issues with SPI (probably down to me :p) so I got another breakout and hooked it up direct to COM.
It’s all working grand now, at the moment I’m simply swapping between COM4 and CDC but eventually I’ll drop CDC and it will be all internal, it does reduce my COM ports though.
Using SPI is a bad idea anyway but the shield uses SPI because Arduino only has one serial port. We have this on our list of you get any progress there the community would love to see it…and we will get you bunch of experience points of course
Here’s a thought, you could rework this board with jumper sets for if you want to use SPI, COM1, COM4 etc in the space wasted for a prototype area that way we can just choose what mode we want on the board.