How to connect your Di2 system to your Windows computer
Modern Di2 is basically a couple of controllers and servo motors that communicate with each other using the EW-SD50 wires. Shimano lets end-users configure their own Di2 systems using their e-tube project software. This page explains how to connect your bike to your computer.
Connecting a Di2 bike to a Windows computer is done via the charging / interface port on the Junction A. Note that if your bike uses the older SM-EW67A junction then you will not be able to connect your bike using the charger.
In that case you need the SM-SM-PCE1/SM-PCE02 diagnostics device.
You probably know where the charging port is - but just in case you don't, have a look at this image:
Connect using e-Tube Project
Plug your charger into the junction box and connect the other end to your computer – the order doesn’t really matter, but I tend to plug the connector into the bike first. Start the e-Tube Project software. Then just click the 'Next' button.
It’ll then tell you that charging has stopped because you’ve connected the bike to the computer and started the software.
Also, it will tell you to use the disconnect button when you're done and then start unit recognition.
When the connection has been made successfully you will be show the Customize tab. This is where you can set up or tweak each component.
View installed components
Sometimes it is useful to see the list of installed components. When troubleshooting unresponsive components for example. By checking the list of installed and connected components you can figure out what part of the Di2 "circuit" is broken. Almost all components are listed on the Update tab.
If a component isn't listed here that means that it either isn't connected or it doesn't have any firmware that can be updated. Junction B (SM-JC41 / SM-JC40) and the external battery won't show up here for example.
Done? Use the disconnect button
When you're done please use the disconnect button as seen at the top left of the window. If you do not, the bike may not respond or may end up draining the system battery until you reconnect it. It isn't hard, but it is something to keep in mind.
Other things you can do with E-Tube Project:
- Update your component firmware
- Micro-adjust your rear/front derailleurs
- Change the Wireless passkey
- Set up Synchronize Shift
- Change button assignments and set up the switches on the shifter hoods
Questions? Leave a comment or send me a message.