Cloud Electronics PM12 - Manual (Page 27)

PM4/8/12/16 Installation and User Guide v2.2 27
Systems with multiple paging microphones
Connecting a single Cloud PM microphone to a host mixer is quite straightforward.
If more than one microphone is required in a system, various additional factors need
to be taken into account. As far as systems with multiple PMs are concerned, most of
these factors are already covered elsewhere in the manual. The following information
may provide some additional guidance.
NOTE: The BUSY LEDs on ALL the microphones in a system illuminate while paging
is taking place, regardless of which microphone is being used.
System Interconnection
Multiple PMs* are interconnected in “daisy-chain” fashion via the Digital Paging
Interface, using CAT-5 cable and RJ45 connectors. In the following description, note
that the “last” PM refers to that connected directly to the host mixer, and the “end”
or “first” PM refers to that farthest from the mixer in terms of the daisy-chain
interconnection (which may not be the same thing as the microphone which is the
greatest physical distance from the host mixer).
The OUT of the PM at the “end” of the network is connected to the IN of the next,
whose OUT in turn is connected to the IN of the next, and so on. The “last” PM in
the chain is then connected to the mixer, either by a further CAT-5 connection from
its OUT connector to the Digital Paging Interface input on the host mixer, or via
the analogue interface using separate audio and access cables. The examples below
illustrate some typical situations.
IN OUT OUT
CAT-5 CAT-5
CAT-5 CAT-5 CAT-5
(with Digital Paging Interface)
IN OUT
IN OUT
AUDIO OUT
ZONE ACCESS CONTROL
Mixer
IN OUT
MIC INPUT PAGING ACCESS
Mixer
+12V Z1 Z2 Z3 Z4 Z5 Z6 Z7 Z8 0V
LF HF GAIN (dB)
50
1 2 3
10
+ - - +
(with Analogue Paging Interface)
CDPM
GAIN (dB)
IN THRU
-10 +10