Nikon D6 Reference Manual page 683

Option
[Remote camera
check]
[Number of
remote cameras]
5
Select [Network settings],
highlight [Synchronized
release], and press J .
The camera will connect to the
network.
Select [On] to check whether the remote
cameras are ready.
•
This option is available only if [Master camera]
is selected for [Master/remote] on the current
camera.
•
The camera network indicator will flash amber
to warn if the number of cameras returning
"ready" is less than that selected for [Number
of remote cameras].
Enter the number ([1]–[10]) of remote cameras in
the group. This option is available only if [On] is
selected for [Remote camera check].
Description
Synchronized Release
631