11
4
3
2
1
USB2.0
SWITCHED
USB 1
USB 2
5V
2A
INDOOR
USE
ON
L
Y
USER
CONSOLE
OPTIONS
4
3
2
1
USB2.0
SWITCHED
USB 1
USB 2
5V
2A
INDOOR
USE
ON
L
Y
USER
CONSOLE
OPTIONS
Slave AV4PRO-DVI
Master AV4PRO-DVI
Master
monitor
Slave
monitor
Computers fitted
with multiple
video heads
Serial
synchronisation
cable
Synchronising multiple units
AV4PRO-DVI units can be connected together so that they operate
in a synchronised manner. Thus, two AV4PRO-DVI units can be
made to switch two video heads in a similar manner to an AVPRO-
DVI-DUAL. Additionally, two AVPRO-DVI-DUAL units could be made
to resemble an AVPRO-DVI-QUAD, while two AVPRO-DVI-QUAD
units could be combined in order to switch up to eight video heads
simultaneously.
Whenever an AV4PRO-DVI channel is switched, it sends an RS232
command out on its serial interface (marked
OPTIONS
on the rear
panel). An AV4PRO-DVI 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-DVI devices from operating correctly. For more details
about the serial synchronisation cables, see
Appendix 2
.
