With this handy module you can make a USB to 5v serial cable. With it you can connect the node to a serial
terminal program or to a computer running JMRI.
DigiKey item MOD USB SERIAL 5V EMBEDDED PCB 768-1017-ND $15.00
Much better than the old perf board version. There are ten on one PC Board so with 3 boards per OSHPark order you get 30 connectors. At $37.55 per order that's $1.25 per board.
The terminal blocks takes up to 14ga wire.
The DigiKey part number is ED1601-ND
Download PC Board file here.