Actually, this is an article that briefly went up the other day
but the content was risky, so I self-censored it.
It's a shame to scrap it, so I've made some corrections and reposting it.
I was asked to do a special installation of the Shimano Alfine display unit (SC-S705).
The SC-S705 displays the number of gear positions and battery remaining on Shimano's electric drivetrain.
This time, I'm incorporating it into a 9070 Dura-Ace groupset.
↑There are two wiring ports.
↑It has a 3mm diameter shaft held in place with a snap ring.
Normally, you'd slip the included rubber onto this shaft and secure it to the handlebar with a zip tie,
but we're planning to mount a satellite switch in this location,
so the mounting positions overlap.
So we needed to come up with an alternative mounting method.
So I removed the shaft
and swapped it for an M3 long cap screw bolt.
A cap screw is the type of fastener where the head is turned with an Allen key.
By coincidence, by chance, by fortunate timing,
an aluminum plate of just the right shape
happened to be lying around, so I used that.
↑I may appear to be laying down defensive cover in case someone asks me to make another one like this in the future, and that's exactly what I'm doing.
It fit perfectly.
Man, that was lucky.
On the back of the Pioneer pedaling monitor SGX-CA500's bracket,
there are two M3 nuts embedded.
Oddly enough, these are not functional parts.
Except for the slide lock section, it's one solid piece,
so the nuts aren't involved in assembling the bracket itself.
So I decided to repurpose these.
I drilled holes and threaded M3 bolts through.
Then I drilled holes in that mysterious aluminum plate
and secured it to the bracket,
↑and this is what we get.
Now we have space for mounting the satellite switch.
About display unit compatibility
This SC-S705,
overlaps in function with the roadbike groupset's upper junction (hereafter JC)
and is considered the same part, so they can't be used together.
In fact, when you connect a bike with both the display unit and upper JC to e-tube simultaneously,
a warning appears saying these two can't be used at the same time.
The display unit lacks functions that the upper JC has,
such as the saver restore function and shift adjustment.
In this case, shift adjustment is done by connecting to e-tube.
Using the display unit and upper JC together is currently impossible.
If you connect the display unit to an unused port on a system that's working fine without it,
not only will the display unit not function,
but shift operation will also stop responding.
However, it has worked in the past.
The upper JC's latest firmware version is 2.2.0, but
to my knowledge, on 2.0.2 it worked with simultaneous connection.
It stopped working with simultaneous connection at, I believe, version 2.1.0.
Now for the wiring details.
The upper JC and frame side look like this.
This part is the same on any bike.
The upper JC has 5 ports because this build is set up with 5 ports.
On 9070 and 6870 levers, there are three ports.
The bottom port has a notch.
Any cable can go in here, but
only the sprinter switch cable
is designed to fit exclusively here,
so effectively the bottom port is sprinter switch-only.
I installed the sprinter switch.
Then I installed the display unit into the last port of the right lever.
The other port of the display unit is blocked with a dummy plug.
When I first assembled it straight out of the box,
the display's screen didn't light up,
but once I updated the firmware, the display came on.
If you update the upper JC's firmware,
you can no longer operate it with simultaneous connection,
so this update needs to be done with just the display unit alone.
For the satellite switch, with all the right lever ports taken up,
it will be either directly connected to the upper JC or connected to the left lever.
As long as the satellite switch is set to rear shifting,
it functions as a rear shift switch whether connected to the upper JC or the left lever (confirmed).
Connecting to the left lever means the upper JC only needs 3 ports,
and the extra wiring can be wrapped into the bar, making the appearance somewhat cleaner.
Connecting to the upper JC has the advantage of being able to quickly attach and detach the satellite switch depending on the situation.
For example, you'd hardly ever use it in a criterium.
↑In summary, it looks like this.
To reiterate,
if the upper JC firmware is the latest version, this won't work.
Simply pull out the display unit and it'll start working right away.
I know someone else using it this way,
but since you can't downgrade the firmware to an older version,
once you update it, that's the end.
↑It's fine to just update the display unit's firmware to the latest version.
If the upper JC firmware is newer,
you can't have simultaneous connection with the display unit, but
if you set a lower JC in the upper JC's position,
you don't violate the "either upper JC or display unit, one or the other" rule,
so at least for now it should work.
However, without the upper JC, you can't do shift adjustment on the bike alone.
You also can't use the saver function.
Okay, so that's it.
Should this be alright?
↑Who am I even asking?
It wasn't really alright.
but the content was risky, so I self-censored it.
It's a shame to scrap it, so I've made some corrections and reposting it.
I was asked to do a special installation of the Shimano Alfine display unit (SC-S705).
The SC-S705 displays the number of gear positions and battery remaining on Shimano's electric drivetrain.
This time, I'm incorporating it into a 9070 Dura-Ace groupset.
↑There are two wiring ports.
↑It has a 3mm diameter shaft held in place with a snap ring.
Normally, you'd slip the included rubber onto this shaft and secure it to the handlebar with a zip tie,
but we're planning to mount a satellite switch in this location,
so the mounting positions overlap.
So we needed to come up with an alternative mounting method.
So I removed the shaft
and swapped it for an M3 long cap screw bolt.
A cap screw is the type of fastener where the head is turned with an Allen key.
By coincidence, by chance, by fortunate timing,
an aluminum plate of just the right shape
happened to be lying around, so I used that.
↑I may appear to be laying down defensive cover in case someone asks me to make another one like this in the future, and that's exactly what I'm doing.
It fit perfectly.
Man, that was lucky.
On the back of the Pioneer pedaling monitor SGX-CA500's bracket,
there are two M3 nuts embedded.
Oddly enough, these are not functional parts.
Except for the slide lock section, it's one solid piece,
so the nuts aren't involved in assembling the bracket itself.
So I decided to repurpose these.
I drilled holes and threaded M3 bolts through.
Then I drilled holes in that mysterious aluminum plate
and secured it to the bracket,
↑and this is what we get.
Now we have space for mounting the satellite switch.
About display unit compatibility
This SC-S705,
overlaps in function with the roadbike groupset's upper junction (hereafter JC)
and is considered the same part, so they can't be used together.
In fact, when you connect a bike with both the display unit and upper JC to e-tube simultaneously,
a warning appears saying these two can't be used at the same time.
The display unit lacks functions that the upper JC has,
such as the saver restore function and shift adjustment.
In this case, shift adjustment is done by connecting to e-tube.
Using the display unit and upper JC together is currently impossible.
If you connect the display unit to an unused port on a system that's working fine without it,
not only will the display unit not function,
but shift operation will also stop responding.
However, it has worked in the past.
The upper JC's latest firmware version is 2.2.0, but
to my knowledge, on 2.0.2 it worked with simultaneous connection.
It stopped working with simultaneous connection at, I believe, version 2.1.0.
Now for the wiring details.
The upper JC and frame side look like this.
This part is the same on any bike.
The upper JC has 5 ports because this build is set up with 5 ports.
On 9070 and 6870 levers, there are three ports.
The bottom port has a notch.
Any cable can go in here, but
only the sprinter switch cable
is designed to fit exclusively here,
so effectively the bottom port is sprinter switch-only.
I installed the sprinter switch.
Then I installed the display unit into the last port of the right lever.
The other port of the display unit is blocked with a dummy plug.
When I first assembled it straight out of the box,
the display's screen didn't light up,
but once I updated the firmware, the display came on.
If you update the upper JC's firmware,
you can no longer operate it with simultaneous connection,
so this update needs to be done with just the display unit alone.
For the satellite switch, with all the right lever ports taken up,
it will be either directly connected to the upper JC or connected to the left lever.
As long as the satellite switch is set to rear shifting,
it functions as a rear shift switch whether connected to the upper JC or the left lever (confirmed).
Connecting to the left lever means the upper JC only needs 3 ports,
and the extra wiring can be wrapped into the bar, making the appearance somewhat cleaner.
Connecting to the upper JC has the advantage of being able to quickly attach and detach the satellite switch depending on the situation.
For example, you'd hardly ever use it in a criterium.
↑In summary, it looks like this.
To reiterate,
if the upper JC firmware is the latest version, this won't work.
Simply pull out the display unit and it'll start working right away.
I know someone else using it this way,
but since you can't downgrade the firmware to an older version,
once you update it, that's the end.
↑It's fine to just update the display unit's firmware to the latest version.
If the upper JC firmware is newer,
you can't have simultaneous connection with the display unit, but
if you set a lower JC in the upper JC's position,
you don't violate the "either upper JC or display unit, one or the other" rule,
so at least for now it should work.
However, without the upper JC, you can't do shift adjustment on the bike alone.
You also can't use the saver function.
Okay, so that's it.
Should this be alright?
↑Who am I even asking?
It wasn't really alright.