Canon EOS-1D C - Manual (Page 80)

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Steps 1–5 are the same on master and slave cameras.
Connect the EOS-1D X cameras to each other with a LAN cable. When
there are multiple slave cameras, connect them to a hub with LAN
cables, and connect the hub to the master camera with a LAN cable.
1
On the [53] tab, select
[Communication settings].
2
Select [Network settings].
Once [Communication func] is set
to [Enable], you can select [Network
settings].
3
Set [Communication mode] to
[Disconnect].
Once [Communication mode] is set
to [Disconnect], you can select
[Sync time between cameras].
Synchronizing the Time
COP
Y