I picked up some cable fasteners from Fry's Electronics today. I used them to tidy up and secure the AC power cable for the Elk-M1Gold controller.

I also brought some 4-conductor wire, Cat-5 wire, RJ-45 plugs, and crimping tools with me and started connecting the various components together.

First, I connected the Elk-M1DBH to the Elk-M1Gold controller with the 4-conductor wire. The Elk-M1DBH sits on the RS-485 bus and acts like a hub.

Next, I built some Cat-5 cables to connect the Elk-M1DBH to the Elk-M1XSP's. I need to pick up some short #4 screws. I'll use them to attach the Elk-M1XSP circuit boards to their enclosures (without their covers) and then I'll use sticky tape to attach the enclosures to the structured wiring panel.

I configured one Elk-M1XSP to interface with the UPB lighting controls and set it to address #1 (device type 5). I configured the other Elk-M1XSP to interface with the Aprilaire thermostats and set it to address #2 (device type 5). I also configured the Elk-M1XIN to address #2 (device type 2 -- the Elk-M1Gold is address #1 by default).

From the M1G Installation and Programming manual:

Each data bus device is a specific "Device Type". Keypads are TYPE 1, Input (Zone) Expanders are TYPE 2, Output Expanders are TYPE 3, Serial Port Expanders are TYPE 5.... Every data bus device MUST have a unique "Address" setting within its type.