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Serial port switching
The AVU6004A and AVU6008A modules use a sophisticated switching system
to extend the ordinarily point-to-point nature of serial communications across a
network of connected display units. The Wizard MultiMedia Plus system allows
you to communicate with any display individually or to broadcast commands
across the network as a whole. When switching to a single display, it is then
possible to receive responses back from that display. When ‘broadcasting’ to all,
it is only possible to send commands in a uni-directional manner (such as ‘on’
and ‘off’).
A simple system of ASCII commands is used to effect the switching. You can
issue such commands directly via an ASCII console or use a utility to provide an
intuitive graphical interface. Once a switching command is issued, the network
will remain fixed at that setting until a new command is sent, therefore there is
no need to precede every RS232 command with a header sequence.
Port switching commands
The ASCII port switching command structure is as follows:
<AV PORT 27B>
<AV PORT 14A>
1
2
2
3
4
5
6
8
A
B
Primary
Transmitter
1
1
2
3
5
6
7
8
A
B
14A
14B
27A
27B
4
7
TRANSMITTER
TRANSMITTER
RECEIVER
RECEIVER
<AV PORT
>
CPD
C
ascade
[1 to 4]
P
ort
[1 to 8]
D
isplay
[A, B or X]
Note: The command must use
capital letters and there must be
a space between ‘AV’ and ‘PORT’,
and also between ‘PORT’ and the
cascade number.
The primary transmitter is
automatically numbered as
Cascade
1,
with successive
cascaded transmitters taking
numbers
2
to
4
. The
Port
number is determined by the
link cable port on the transmitter
to which a given receiver is
connected. The
Display
character
is determined by which of the
Y-cable
connectors is used (X
opens a one-way link to both
displays). If no Y-cable is used, a
single display will be A.
To connect with all displays, issue
the following command:
<AV.PORT.ALL>
Module switching commands
In addition to affecting individual ports, it is also possible to collectively enable
and disable all of the CATx outputs from a particular transmitter (at power
on, all CATx outputs are enabled by default). Disabling the outputs of one
transmitter will not affect the operation of other transmitters that are cascaded
through the disabled module.
To disable all CATx outputs on a transmitter:
<AV.DISABLE.n>.
where
n
is the transmitter number (1, 2, 3 or 4)
To enable all CATx outputs on a transmitter:
<AV.ENABLE.n>.
where
n
is the transmitter number (1, 2, 3 or 4)
.
