The Auxiliary board comes completely assembled and tested.

There are only two tasks to do with this board:

  1. Mount the Auxiliary board on the HMI board
  2. Build and install the 10-conductor Radio I/O ribbon cable

Visit the Build: Ribbon Cables post for details about building ribbon cables.

Once these tasks are completed the assembly is complete.

If you ordered an Option 1 board with the build-in Radio I/O circuit you should install the appropriate switch settings and jumpers for your application. The HW: Radio I/O Module post explains these options.

You should then go to the HW: Radio I/O Wiring Diagrams post to learn how to connect it to your radio.

If you ordered an Option 2 board with just the 10-pin ribbon connector and RJ45 jack, connect the Auxiliary board to your manual RJ45 switch using a short length of CAT5 cable.

Mounting the Auxiliary Board

You can mount the Auxiliary board above or below the HMI board. I like the I/O jacks on the HMI near my desktop for cable routing so the HMI board is always the bottom board of the stack.

To assemble the stack, start with the short standoffs supplied with the HMI board. Insert them from the bottom of the HMI board with the threaded shaft facing up. Thread the long standoffs onto the short standoffs threaded shafts and tighten. Place the Auxiliary board on top of the long standoffs and thread the M3 nuts onto their threaded shafts.

The completed assembly is shown below.

HMI with Auxiliary Option 1 Board Installed


The Auxiliary board connects to the HMI board using a 40mm 10-conductor ribbon cable. This post has information on building this cable.