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Multi-device Digital Audio I/O
Extron EXP Bus
A digital audio connection to an external DMP128 is supported through the rear panel
EXP port using the expansion bus mix matrix. The expansion bus mix matrix can route
any or all of the mic/line inputs and virtual returns to the expansion outs (1-8) with eight
additional channels (expansion outs 9-16) directly connected to the virtual bus returns.
The expansion outputs use an Extron proprietary protocol to exchange audio channels
with another device using the same Extron protocol.
Multi-channel audio on the 16-channel expansion out bus may be processed and used by
the connected DMP128 then returned to the sixteen (16) input expansion bus return.
The expansion bus may also be used for AEC reference. Expansion inputs can include
automix processing, and be included in a gating group.
Only one device can be shown in the DSP Configurator screen at any time. There are two
ways to configure the two devices; switch between the two using the device manager
described above, or open a second DSP Configurator dialog box and connect it to the
second device.
Device Manager
When two DMP128 devices are connected using the EXP bus, the tools menu is used to
configure the connection.
By default, the DMP128 is configured as the primary device. One of the two connected
DMP128 devices must be set as a “secondary unit”. To change the active device in the
DSP Configurator dialog box to secondary, use the >Tools>Expansion Bus menu and
select primary or secondary. A checkmark appears beside the active device.
From the menu bar, select Tools>Device Manager to open the device manager dialog
shown in figure 48.
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Figure 48. Device Manager Dialog
The icons function as follows:
a Add Device – Brings up the initial DSP Configurator dialog box that allows the
selection of the model number of the secondary device.
b Clone Device – Provides the option to duplicate the primary device configuration to
the connected secondary device.
c Delete Device – Deletes the highlighted device
d Expand or Collapse Device – If the device connection tree is collapsed, allows it to
be expanded. If the device tree is collapsed, expands it.
The icons for the devices will be grayed out if the device is offline.
DMP128 • Software Control 81