Kramer Electronics VS-1616A - Manual (Page 19)

Installing the Balanced Stereo Audio Matrix Switcher
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Note that each group of switchers has a unique MACHINE # that is
shared by all members of the group. In
Figure 11 , the 32x32 composite
video matrix switcher is MACHINE # 1, the 32x16 digital video matrix
switcher is MACHINE # 2 and so on. Control of the system is via the
MACHINE #’s.
Figure 11: Assembling a System of Interconnected Switchers