Date printed: 24.01.12
12
D21m System
The RS422 link for the second hub may be taken from the Vista desk by using
a further RS422 port.
The channel count of the MADI link may be set in steps of eight channels
using card-internal DIP switches. In order to provide synchronization and
surveyor information it is necessary to provide a MADI link to and from the
remote I/O boxes at all times, even if the channel count should be set to 0.
The protocol switch on the front panel of the MADI I/O card may be set to
‘64 channel’ to allow maximum usage of the available channels. This switch
may only have to be set to ‘56 channel’ protocol for operation with third-
party MADI devices (in case no remote I/O box is connected to the MADI
I/O card).
If 64 channels of MADI transmission are required when working at 96 kHz,
the redundant MADI line can be used as a ‘channel extension’ for transmit-
ting the MADI channels 33-64 (29-56). This must be set accordingly with a
DIP switch on the MADI I/O card inserted in the hub frame.
3.5 Shared I/O
SCores &
I/O Frames
96 Ch In
96 Ch Out
96 Ch In
96 Ch Out
96 Ch In
96 Ch Out
96 Ch In
96 Ch Out
Hubs
(and I/O)
Remote I/O Box
0...64 Ch Optical MADI
0...64 Ch Optical MADI
‘Redundancy’
Input Switch
on Front Panel of
MADI HD Card
96 Ch In
96 Ch Out
96 Ch In
96 Ch Out
96 Ch In
96 Ch Out
96 Ch In
96 Ch Out
RS422
RS422
1
2
redundant
It is possible to connect one remote I/O box to two hubs or consoles at the
same time. This allows sharing of one box between two consoles. While the
audio inputs are fed to both consoles, the outputs on that I/O box may only
be fed by one of the two consoles at a time. An input selector switch on the
MADI HD card determines from which console the audio outputs are fed. At
the same time only the currently selected console will be able to display health
information in the surveyor. If the switch is set to ‘redundant’, the remote I/O
box jumps freely onto the second input in case the signal is lost on the main
input. Unless the signal is interrupted on the redundant input, too, the system
will not switch back to the main input in order to avoid undefined switching
in case of a bad MADI connection.
