Dateq MusiCall MPM8.8 Mono, Installation Manual

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5 Connecting MusiCall Installation manual EN
Connecting the wallunits
The wallunits are connected to the MusiCall
system with a two-wire cable. These two wires are
used for both the power-supply and the data
communication.
Unshielded cable can be used for this. However when a high level of interference is
expected it is more safe to use shielded cables, because otherwise the
communication between the host and the wallunit might become unreliable.
Interfering sources can be dimmers, motors etc.
The wallunits are connected to the green connectors at central unit. Each
zone can have it’s own wallunit. It’s also possible to set the audio-source
and the volume with the console or the PC software, and leave the wallunit
unconnected.
Wallunits are not polarity sensitive.
A maximum of two wallunits can be connected in parallel. They will have
the same functionality. This can be useful in a room with more than one
entrance.
Connecting the local audio input
Local audio inputs are connected to the outermost pins of the green connectors. A
wallunit has to be connected when you want to connect a local audio input, because
otherwise the local input cannot be selected.
The local inputs are, unlike the wallunits, sensitive to the polarity. When the
local input is connected in the wrong way no audio
will be heard, however the unit will not get defective.
Internally a gain-trimmer is available to adjust the
sensitivity.
To prevent from interference use shielded cable (i.e.
microphone-cable) to connect the local audio inputs
to the MusiCall central unit. The shielding must be
connected to the minus of the green connector at the
MusiCall host. At the MRA the shielding can be connected to the middle pin of the
XLR-connector (See earth-symbol in the drawing). Keep in mind that the shielded
MRA-cable must not be placed in parallel (very closely) with the speaker cable for a
long distance because this could cause oscillations. Do not draw the wallunit-cable in
the same shielded cable as the MRA, because the data will be heard over the audio
signal from the MRA.
Connecting the consoles
A maximum of two consoles can be connected to the system. The
consoles are connected with a four-wire cable; two wires for data and
power, and two wires for the microphone signal. An unshielded cable
can be used, however it is advisable to use a shielded cable.
One pair is connected to the middle two pins, the other pair is
connected to the outermost two pins. Both pairs are not sensitive to the
polarity.
When using the equipped connector-box the red and green cable must
be connected to the inner two connectors, and the black and yellow
cable must be connected to the outer-two connectors.
Controllers R 232
Zone 1 Zone 2 Zone 3 Zone 4 Zone 5 Zone 6 Zone 7 Zone 8 Console 1 Console 2 Line
To the
WallUnit
To the local
input
-
+
Rearview of
local input
+ -
To the
console