Neumann.Berlin DMI-8 - Handbuch (Seite 7)

12 EN 13 EN
AES42 IN
Eight 3-pin XLR inputs for connecting digital mi-
crophones.
AES/EBU OUT
25-pin sub-D connectors with Yamaha and Tascam
pinout for the AES/EBU output signal.
The AES/EBU signal includes 2 standard audio
channels.
The distribution of the audio data of adjacent
mono microphone channels between the audio
channels of the corresponding AES/EBU output
signal is as follows:
Channel 1 AES/EBU OUT
Left:
microphone 1
Right: microphone 2
Channel 2 AES/EBU OUT
Left:
microphone 3
Right: microphone 4
Channel 3 AES/EBU OUT
Left:
microphone 5
Right: microphone 6
Channel 4 AES/EBU OUT
Left:
microphone 7
Right: microphone 8
Digital stereo microphones are supported at odd-
numbered AES42 microphone inputs only. In this
case the audio data of the microphones are routed
to the left and right channels of the corresponding
AES/EBU output.
ADAT OUT
Connector (Toslink) for the optical transmission
of the 8 microphone channels at 44.1 kHz or
48 kHz.
GN OUT
The RJ 45 connector for serial transmission of
the 8 microphone channels employs a special
data format developed by Neumann. This signal
will be used by Neumann multi-channel audio
interfaces in the future for converting to formats
such as Ethersound, MADI, etc. This special data
format permits very simple processing for word
clock frequencies of up to 192 kHz. The GN OUT
simultaneously supplies power for the Neumann
multi-channel audio interfaces. The result is a
very cost-eff ective system solution with extensive
functionality and fl exibility.
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CONTROL BUS (RS 485)
RJ 45 ports for connecting a computer (PC or
Mac). Standard Ethernet (patch) cables are used
(Shielded Twisted Pair – STP or Unshielded Twist-
ed Pair – UTP).
Data transfer is performed via an RS 485 interface
with an additional power-out pin, for the optional
supply of an external control device.
Attention: The RJ 45 ports of the DMI-8 must
not be connected to an Ethernet.
The two RJ 45 ports are connected in parallel, in
order to permit multiple DMI devices to be cas-
caded and controlled by a single computer.
The DMI-8 is connected to the normally avail-
able USB port of a PC or Mac. The Neumann USB/
RS 485 converter (not included) is required for
this purpose. This permits the plug-and-play ca-
pability of existing USB ports to be combined with
the much greater cable lengths (of 100 m or more)
that are possible with an RS 485 connection.
ID [device address]
A coding switch permits setting of the device ad-
dress. If multiple DMI devices are cascaded and
controlled by a single computer, they must have
diff erent device addresses (IDs).
Attention: The ID is detected only during the pow-
er-up process. After the ID is changed, the power
supply must therefore be interrupted briefl y and
then turned back on again.
Please see the RCS control software operating
manual for information concerning the mode of
operation and assignment of device addresses.
USER PORT
The user port permits the direct control of the
microphone functions Mute, Light 1 and Light 2
(selected via RCS) by means of external switch
contacts or logic signals.
The assignments of the 9 pins are as follows (low-
active):
pin 1 channel 1
pin 2: channel 2
pin 3: channel 3
pin 4: channel 4
pin 5: ground
pin 6: channel 5
pin 7: channel 6
pin 8: channel 7
pin 9: channel 8
The pins can be controlled via contact with
ground, or alternatively by means of logic outputs
(TTL logic level). For instance, with a single con-
tact, Mute can be activated and the red LED can
be switched off (e.g. for the On Air function).
Attention: The respective switch function is acti-
vated only when User Port is selected in the RCS
control software, for the control of the particular
function.
4. Equipment supplied
DMI-8 Digital Microphone Interface
Power cable
Operating manual
CD with RCS software and USB drivers
5. Setup
The following steps are to be carried out for the
initial installation of a digital microphone system
consisting of the microphone, the DMI-8 Digital
Microphone Interface and the RCS control soft-
ware.
First install the RCS and the associated drivers on
your computer.
The minimum computer requirements for operat-
ing the RCS control software are specifi ed in the
RCS operating manual.
Start the setup program on the enclosed CD-ROM
(Windows: “Setup”; Mac OS: “Install RCS”) and
follow the instructions displayed on the screen.
Attention:
Administrator rights are required in order to
install the software.
The USB 485 converter must not be connected
to a computer USB port until after the RCS soft-
ware has been installed.
USB driver installation
After the RCS has been installed, the USB 485
converter must be connected to the computer
USB port. This ensures loading of the supplied
USB driver, which is required for operation of the
converter.
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Other connections
Connect the USB 485 converter to one of the RJ 45
ports (CTL BUS) of the DMI-8 by means of a patch
cable (not included).
Set the device address (ID) of the DMI-8 (by us-
ing the coding switch on the back of the DMI). Ad-
dresses should be assigned beginning with “0”.
Attention: The ID is detected only during the
power-up process of the DMI-8. After the ID is
changed, the power supply must therefore be in-
terrupted briefl y and then turned back on again.
Connect the microphone, the DMI-8 and the sub-
sequent device (e.g. a mixing console)
If the DMI and the connected microphones are to
be synchronized with an external synchronization
signal (a word clock or AES11 signal), use a BNC
cable to connect the sync signal to the word clock
input of the DMI-8.
If multiple DMIs are used, they are cascaded via
the control bus. For this purpose, use an RJ 45
patch cable to connect the second RJ 45 port of
the fi rst DMI to one of the RJ 45 ports of the next
DMI, etc.
Since the DMIs must also be synchronized with
one another, connect the BNC output (word clock
or AES11) of each DMI to the BNC input of the sub-
sequent device.
Connect the DMI-8 to the power supply system
and start the RCS software.
Attention: The DMI-8 must be switched on before
the RCS is started so that the DMI-8 will be de-
tected by the PC or Mac. Alternatively, the com-
mand Options/DMI can be used to detect a DMI.
Due to USB interface specifi cations, in order to
prevent uncontrolled operation of the computer,
while the RCS is running, the cable connecting the
computer to the USB 485 converter must not be
disconnected.
Long microphone cables and multiple connectors
lead to a drop in the microphone supply voltage
and to an increase of jitter, particularly in the
case of high sampling rates. Therefore, if pos-
sible, use continuous cable between the micro-
phone and the DMI-8, and between the DMI-8 and
subsequent equipment. For longer distances use
AES/EBU cable exclusively (with an impedance of
110 ohms).
Ensure that the microphones and all devices in
the digital signal chain are synchronized. Micro-