11
4
3
2
1
USB2.0
SWITCHED
USB 1
USB 2
5V
2.5A
INDOOR
USE
ONLY
USER
CONSOLE
OPTIONS
4
3
2
1
USB2.0
SWITCHED
USB 1
USB 2
5V
2.5A
INDOOR
USE
ONLY
USER
CONSOLE
OPTIONS
Slave AV4PRO-VGA
Master AV4PRO-VGA
Master
monitor
Slave
monitor
Computers fitted
with multiple
video heads
Serial
synchronisation
cable
Synchronising multiple units
AV4PRO-VGA units can be connected together so that they operate
in a synchronised manner. Thus, two AV4PRO-VGA units can be
made to switch two video heads in a similar manner to an AVPRO-
VGA-DUAL. Additionally, two AVPRO-VGA-DUAL units could be
made to resemble an AVPRO-VGA-QUAD, while two AVPRO-VGA-
QUAD units could be combined in order to switch up to eight video
heads simultaneously.
Whenever an AV4PRO-VGA channel is switched, it sends an RS232
command out on its serial interface (marked
OPTIONS
on the rear
panel). An AV4PRO-VGA will switch its channel if it receives the
same command on its serial interface. Consequently, by linking the
serial interfaces, a master unit may be made to automatically switch
one or more slave units as shown in the diagram.
It should be noted that the synchronisation cable deliberately does
not have the transmit pin of the Slave End connector linked to the
receive pin of the Master End connector. To do so would cause the
Slave unit to be able to switch the Master unit. This would setup
an endless cyclical switching sequence that would prevent the
AV4PRO-VGA devices from operating correctly. For more details
about the serial synchronisation cables, see
Appendix 2
.
