Method of operation
An EOL slave module PVA-1WEOL is installed at the end of the speaker line. The speaker line
is used for both the power supply of the module (via the non-audible pilot tone) and for bi-
directional communication between the EOL master in the output stage and the EOL slave
module (using very low-frequency signals). If a communication error occurs – for example, if
the EOL master does not receive a response from the slave – then an error message is
generated. The unique addressing of the slave modules means that multiple slave modules can
be connected to one speaker line.
For communication between the master and the slave modules, the EOL slave modules must
be connected to ground. The shielding on the speaker cable, a free wire in the speaker cable,
or any other available ground point – such as the safety ground of the power supply system –
can be used for this purpose. The resistance R
G
between an output line of the amplifier and
ground must be at least 1.5 MΩ. The capacity C
G
between an output line of the device and the
ground must not be greater than 400 nF.
+
-
-
Filter
DC/DC
Send/
Receive
Control
Address
Speaker +
Speaker -
Shield / Wire / Ground
R
G
C
G
Figure 8.1: Circuit diagram (R
G
and C
G
are caused by the loudspeaker installation, e.g. wire type, length)
EOL monitoring function setup
Connect the EOL slave modules to the end of the speaker line. Set the desired address at the
DIP switches ➊. For details please refer to the installation note of the PVA-1WEOL.
Plena EOL
The Plena end-of-line boards can be used for permanent supervision on not active and active
speaker lines. The PLN-1EOL module can be used e.g. for speaker lines with permanent
background music or if passive volume controls are used.
Plena end-of-line boards PLN-1EOL monitor the presence of a pilot tone on a loudspeaker line.
The board connects at the end of a loudspeaker line and detects the pilot tone signal. This
signal is always present on the line: when back ground music (BGM) is playing, when a call is
in progress, and when no signal is present. The pilot tone is inaudible and at a very low level
(e.g. -20 dB). When the pilot tone signal is present, an LED lights up, and a contact on the
board is closed. When the pilot tone fails, the contact opens, and the LED goes off. If mounted
8.1.3
PAVIRO Router Operation | en 27
Operation manual 12-May-2015 | 03 | F01U306901
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