WDMI-35 Wi-Fi/DCC Loco Interface Module Getting Started
WifiTrax Model Science
www.wifitrax.com
Installation Instructions
The WDMI-35 should be mounted within a locomotive with the 8-Pin NMRA DCC plug inserted into
the corresponding DCC-Ready 8-pin socket on the locomotive’s circuit board. Any DCC decoder with
an NMRA 8-pin plug may then be inserted into the 8-Pin NMRA Socket on the WDMI-35. For
smoother running you can insert the 2-pin plug of our CPM-10 (sold separately) into the 2-pin CPM
Socket on the WDMI-35. The CPM-10 will provide up to 5 seconds of running over dirty track, dead
frogs etc.
(1) Remove the shell from your locomotive and carefully check the location of everything inside
the locomotive including where the optional CPM-10 module will be placed.
(2) Insert the plug on the base of your WDMI-35 module into the 8-pin DCC-Ready socket on
your locomotive’s circuit board. Be sure to insert the module such that pin 1 goes into the
pin-1 socket. See Figure 1. Be sure the underside of the WDMI-35 does not touch any metal
objects on the locomotive circuit board. If necessary use a layer of electrical tape under the
WDMI-35 between it and the locomotive circuit board or any protruding components.
(3) Insert the 8-pin plug of your DCC decoder into the 8-pin NMRA DCC Socket on the WDMI-35.
Be sure that the orange lead of the harness or pin 1 goes into the pin-1 socket. See Figure 1.
(4) If required, insert the 2-pin plug of your CPM-10 module into the CPM Module 2-pin socket
on the WDMI-35. The plug and socket are designed to only be inserted the correct way
around. Do not force the plug into the socket the wrong way around!
(5) Ensure that all modules are in their place and nothing is shorting. You can mount the CPM-
10 with blue-tack or adhesive mounting tape. Any loose wires can be fixed in tidy positions
with blue tack or similar to avoid getting pinched when you replace the plastic shell.
Setup and Operating Instructions
The WDMI-35 can be set up and operated from our free Loco Operator App for Windows and
Android. Loco Operator Version 3.2 (Beta 2) or greater is required.
Wi-Fi - Direct and Infrastructure Modes
There are two ways of driving your loco over Wi-Fi:
Direct Mode and Infrastructure Mode.
When you set up your first installation of
WDMI-35 the Install Wizard gives you two
choices in the way that you configure your Wi-
Fi operation of locomotives, Direct Mode or
Infrastructure Mode.
In direct mode, your computer, tablet or phone
must be connected to the Wi-Fi Access Point within the loco’s installed
WDMI-35. In this mode, you can only operate one locomotive controller with each installation of
Loco Operator on a computer, tablet or phone. In Infrastructure Mode, the locomotive and your
computer, tablet or phone all connect as Wi-Fi Stations to your Home Network Router –your Home
Net. You can then build a full model railroad network with many locos, switch machines, computers,
tablets and phones. You can drive two locos with each installation of Loco Operator, you can run
multi-unit consists and you can control switch machines and power. If you start in Direct Mode, you
can later use the Loco Operator Install Wizard to convert to Infrastructure Mode which generally
works best. Sometimes you may not want to use a router –such as in a Garden Railway –and stay in
Direct Mode.
