Kramer Electronics VS-162AVRCA - Manual (Page 23)

Installing the Audio-Video Matrix Switcher
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Configure the sync via the SWITCHING METHOD Menu command setting 1
Usually, the easiest method is to choose the sync source from the first
machine and then connect all the terminal block connectors.
.
When setting up multiple machines, linking a common sync to all the
machines may be necessary to facilitate simultaneous vertical interval
switching.
In this case, set the first machine to select the sync source from the external
sync connector or from the INPUT # 1 connector. This sync is now available
to the other machines via the RS-485 terminal block connector, as Figure 11
and Figure 12 illustrate. Select the MTX sync on the other machines that
receive that sync.
6.6 Connecting the KEYBOARD EXTENSION
Connecting dry contact-closure switches to the Keyboard Extension (EXT.
KEYS) connector enables you to route an input to an output by remote control
from a distance of up to 1000 meters. These IN and OUT keys are
expandable 2 Figure 14 . illustrates how to connect the Keyboard Extension
(EXT. KEYS):
Figure 14: Keyboard Extension (EXT. KEYS) Connector
To use the Keyboard Extension, activate the extended KEYBOARD setting
Menu command, as section 8.4 describes.
1 Refer to section 8.3
2 Add an unlimited number of push buttons to the existing keys (in parallel) by attaching one end of the push button to the
corresponding number and the other end to the IN or OUT terminal